Check to ensure we're running against the correct LLVM version by jnkel · Pull Request #161788 · rust-lang/rust

jnkel · 2026-08-25T22:30:37Z

The recent LLVM version bump exposed several cases of mishandling LLVM versions, both in-tree and downstream (#161335, #161377, #161572, #162013, https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/opt-dist.20pipeline.20failure.20in.20MSYS2.20CI.20when.20compiling.2E.2E.2E/with/619077952).

If the compiler is run against an incompatible LLVM version, the most common failure mode is a segfault within LLVM, often when looking up target information. This is not obvious to debug, so this PR adds an LLVM version check before initializing LLVM so that we can produce a clearer error.

The second commit in this PR performs a dladdr lookup to print the path to the LLVM we're using. We already have code to do this for finding the sysroot, which I repurposed. However, I don't mind reverting this if it's too complex/risky.

I would appreciate if someone with permissions could trigger a try build on AIX, Windows, and WASI as the second commit touches platform-specific code that I can't test locally.

Before:

error: rustc interrupted by SIGSEGV, printing backtrace
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

After:

thread 'rustc' (3568488) panicked at compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13:
LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 22.1.8 was found at /Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib/libLLVM.dylib
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: configure_llvm
             at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13
   3: {closure#0}
             at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:35:13
   4: {closure#0}<rustc_codegen_llvm::llvm_util::init::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:41
   5: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   6: call_once<rustc_codegen_llvm::llvm_util::init::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:20
   7: init
             at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:34:14
   8: init
             at ./compiler/rustc_codegen_llvm/src/lib.rs:223:9
   9: {closure#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>
             at ./compiler/rustc_interface/src/interface.rs:440:29
  10: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>
             at ./compiler/rustc_interface/src/util.rs:223:17
  11: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>
             at ./compiler/rustc_interface/src/util.rs:180:24
  12: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()>
             at /Users/keljonathan/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/scoped-tls-1.0.1/src/lib.rs:137:9
  13: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>>
             at ./compiler/rustc_span/src/lib.rs:156:21
  14: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>
             at ./compiler/rustc_interface/src/util.rs:176:17
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: the compiler unexpectedly panicked. This is a bug

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/Users/keljonathan/code/rust/rustc-ice-2026-08-25T22_23_11-1423.txt` to your bug report

note: rustc 1.100.0-dev running on aarch64-apple-darwin

note: compiler flags: -C rpath -C debuginfo=0 -Z unstable-options

query stack during panic:
end of query stack

rustbot · 2026-08-25T22:30:41Z

r? @nnethercote

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Zalathar · 2026-08-26T02:59:55Z

AIX seems to be tier 3 so I don't know that we have any tests for it.

Anyhow, here's an assortment of try jobs:

@bors try jobs=test-various,dist-various-1,dist-various-2,x86_64-msvc-1,x86_64-msvc-2,aarch64-apple-1,aarch64-apple-2

Check to ensure we're running against the correct LLVM version try-job: test-various try-job: dist-various-1 try-job: dist-various-2 try-job: x86_64-msvc-1 try-job: x86_64-msvc-2 try-job: aarch64-apple-1 try-job: aarch64-apple-2

rust-bors · 2026-08-26T05:40:38Z

☀️ Try build successful (CI)
Build commit: 6df9663 (6df966363bf7966dc66a6a14597ed4de2ec8492c)
Base parent: 0f33d09 (0f33d0912709e847199218ebab88e2311872f364)

saethlin · 2026-08-30T16:50:48Z

@bors r+

I'm not the foremost expert on these components but I think this looks pretty good and we keep getting issues filed about segfaults that this would clarify.

rust-bors · 2026-08-30T16:50:50Z

📌 Commit 5841e10 has been approved by saethlin

It is now in the queue for this repository.

Check to ensure we're running against the correct LLVM version The recent LLVM version bump exposed several cases of mishandling LLVM versions, both in-tree and downstream (rust-lang#161335, rust-lang#161377, rust-lang#161572, rust-lang#162013, https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/opt-dist.20pipeline.20failure.20in.20MSYS2.20CI.20when.20compiling.2E.2E.2E/with/619077952). If the compiler is run against an incompatible LLVM version, the most common failure mode is a segfault within LLVM, often when looking up target information. This is not obvious to debug, so this PR adds an LLVM version check before initializing LLVM so that we can produce a clearer error. The second commit in this PR performs a `dladdr` lookup to print the path to the LLVM we're using. We already have code to do this for finding the sysroot, which I repurposed. However, I don't mind reverting this if it's too complex/risky. I would appreciate if someone with permissions could trigger a try build on AIX, Windows, and WASI as the second commit touches platform-specific code that I can't test locally. Before: ``` error: rustc interrupted by SIGSEGV, printing backtrace 0 librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140 1 libsystem_platform.dylib 0x0000000184c7d744 _sigtramp + 56 2 libLLVM.dylib 0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40 3 librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104 4 librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880 5 librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344 6 librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68 7 librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148 8 librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68 9 librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48 10 librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112 11 librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168 12 librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112 13 librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208 14 librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392 15 libsystem_pthread.dylib 0x0000000184c73c58 _pthread_start + 136 16 libsystem_pthread.dylib 0x0000000184c6ec1c thread_start + 8 note: we would appreciate a report at https://github.com/rust-lang/rust help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432 ``` After: ``` thread 'rustc' (3568488) panicked at compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13: LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 22.1.8 was found at /Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib/libLLVM.dylib stack backtrace: 0: __rustc::rust_begin_unwind at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5 1: core::panicking::panic_fmt at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14 2: configure_llvm at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13 3: {closure#0} at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:35:13 4: {closure#0}<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:41 5: <std::sys::sync::once::queue::Once>::call at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21 6: call_once<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:20 7: init at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:34:14 8: init at ./compiler/rustc_codegen_llvm/src/lib.rs:223:9 9: {closure#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}> at ./compiler/rustc_interface/src/interface.rs:440:29 10: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()> at ./compiler/rustc_interface/src/util.rs:223:17 11: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:180:24 12: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()> at /Users/keljonathan/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/scoped-tls-1.0.1/src/lib.rs:137:9 13: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>> at ./compiler/rustc_span/src/lib.rs:156:21 14: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:176:17 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. error: the compiler unexpectedly panicked. This is a bug note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: please make sure that you have updated to the latest nightly note: please attach the file at `/Users/keljonathan/code/rust/rustc-ice-2026-08-25T22_23_11-1423.txt` to your bug report note: rustc 1.100.0-dev running on aarch64-apple-darwin note: compiler flags: -C rpath -C debuginfo=0 -Z unstable-options query stack during panic: end of query stack ```

…uwer Rollup of 8 pull requests Successful merges: - #137720 (support `#[target_feature(enable = ...)]` on `#[naked]` functions) - #160923 (Handle multiple action records in EH personality function) - #161788 (Check to ensure we're running against the correct LLVM version) - #161644 (bootstrap: Flatten and rename `compute_src_directory_via_git`) - #161702 (Use `drop_guard` in some places in {core,alloc,std}) - #161931 (Revert "Add rustc_test_entrypoint_marker") - #162015 (touch up "get attribute" docs.) - #162019 (remove a couple of redundant clones, thanks clippy)

Check to ensure we're running against the correct LLVM version The recent LLVM version bump exposed several cases of mishandling LLVM versions, both in-tree and downstream (rust-lang#161335, rust-lang#161377, rust-lang#161572, rust-lang#162013, https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/opt-dist.20pipeline.20failure.20in.20MSYS2.20CI.20when.20compiling.2E.2E.2E/with/619077952). If the compiler is run against an incompatible LLVM version, the most common failure mode is a segfault within LLVM, often when looking up target information. This is not obvious to debug, so this PR adds an LLVM version check before initializing LLVM so that we can produce a clearer error. The second commit in this PR performs a `dladdr` lookup to print the path to the LLVM we're using. We already have code to do this for finding the sysroot, which I repurposed. However, I don't mind reverting this if it's too complex/risky. I would appreciate if someone with permissions could trigger a try build on AIX, Windows, and WASI as the second commit touches platform-specific code that I can't test locally. Before: ``` error: rustc interrupted by SIGSEGV, printing backtrace 0 librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140 1 libsystem_platform.dylib 0x0000000184c7d744 _sigtramp + 56 2 libLLVM.dylib 0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40 3 librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104 4 librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880 5 librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344 6 librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68 7 librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148 8 librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68 9 librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48 10 librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112 11 librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168 12 librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112 13 librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208 14 librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392 15 libsystem_pthread.dylib 0x0000000184c73c58 _pthread_start + 136 16 libsystem_pthread.dylib 0x0000000184c6ec1c thread_start + 8 note: we would appreciate a report at https://github.com/rust-lang/rust help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432 ``` After: ``` thread 'rustc' (3568488) panicked at compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13: LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 22.1.8 was found at /Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib/libLLVM.dylib stack backtrace: 0: __rustc::rust_begin_unwind at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5 1: core::panicking::panic_fmt at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14 2: configure_llvm at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13 3: {closure#0} at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:35:13 4: {closure#0}<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:41 5: <std::sys::sync::once::queue::Once>::call at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21 6: call_once<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:20 7: init at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:34:14 8: init at ./compiler/rustc_codegen_llvm/src/lib.rs:223:9 9: {closure#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}> at ./compiler/rustc_interface/src/interface.rs:440:29 10: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()> at ./compiler/rustc_interface/src/util.rs:223:17 11: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:180:24 12: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()> at /Users/keljonathan/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/scoped-tls-1.0.1/src/lib.rs:137:9 13: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>> at ./compiler/rustc_span/src/lib.rs:156:21 14: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:176:17 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. error: the compiler unexpectedly panicked. This is a bug note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: please make sure that you have updated to the latest nightly note: please attach the file at `/Users/keljonathan/code/rust/rustc-ice-2026-08-25T22_23_11-1423.txt` to your bug report note: rustc 1.100.0-dev running on aarch64-apple-darwin note: compiler flags: -C rpath -C debuginfo=0 -Z unstable-options query stack during panic: end of query stack ```

…uwer Rollup of 11 pull requests Successful merges: - #160923 (Handle multiple action records in EH personality function) - #161788 (Check to ensure we're running against the correct LLVM version) - #158303 (Always escape grapheme extenders in `str::escape_debug`) - #161644 (bootstrap: Flatten and rename `compute_src_directory_via_git`) - #161702 (Use `drop_guard` in some places in {core,alloc,std}) - #161713 (Add config for gram editor to .gitignore) - #161792 (Fix and improve diagnostics for lint `rust_2021_prefixes_incompatible_syntax`) - #161931 (Revert "Add rustc_test_entrypoint_marker") - #162015 (touch up "get attribute" docs.) - #162019 (remove a couple of redundant clones, thanks clippy) - #162023 (Remove redundant braces from `NonZero` doctests)

Rollup merge of #161788 - jnkel:check-llvm-version, r=saethlin Check to ensure we're running against the correct LLVM version The recent LLVM version bump exposed several cases of mishandling LLVM versions, both in-tree and downstream (#161335, #161377, #161572, #162013, https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/opt-dist.20pipeline.20failure.20in.20MSYS2.20CI.20when.20compiling.2E.2E.2E/with/619077952). If the compiler is run against an incompatible LLVM version, the most common failure mode is a segfault within LLVM, often when looking up target information. This is not obvious to debug, so this PR adds an LLVM version check before initializing LLVM so that we can produce a clearer error. The second commit in this PR performs a `dladdr` lookup to print the path to the LLVM we're using. We already have code to do this for finding the sysroot, which I repurposed. However, I don't mind reverting this if it's too complex/risky. I would appreciate if someone with permissions could trigger a try build on AIX, Windows, and WASI as the second commit touches platform-specific code that I can't test locally. Before: ``` error: rustc interrupted by SIGSEGV, printing backtrace 0 librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140 1 libsystem_platform.dylib 0x0000000184c7d744 _sigtramp + 56 2 libLLVM.dylib 0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40 3 librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104 4 librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880 5 librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344 6 librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68 7 librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148 8 librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68 9 librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48 10 librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112 11 librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168 12 librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112 13 librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208 14 librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392 15 libsystem_pthread.dylib 0x0000000184c73c58 _pthread_start + 136 16 libsystem_pthread.dylib 0x0000000184c6ec1c thread_start + 8 note: we would appreciate a report at https://github.com/rust-lang/rust help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432 ``` After: ``` thread 'rustc' (3568488) panicked at compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13: LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 22.1.8 was found at /Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib/libLLVM.dylib stack backtrace: 0: __rustc::rust_begin_unwind at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5 1: core::panicking::panic_fmt at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14 2: configure_llvm at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13 3: {closure#0} at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:35:13 4: {closure#0}<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:41 5: <std::sys::sync::once::queue::Once>::call at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21 6: call_once<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:20 7: init at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:34:14 8: init at ./compiler/rustc_codegen_llvm/src/lib.rs:223:9 9: {closure#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}> at ./compiler/rustc_interface/src/interface.rs:440:29 10: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()> at ./compiler/rustc_interface/src/util.rs:223:17 11: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:180:24 12: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()> at /Users/keljonathan/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/scoped-tls-1.0.1/src/lib.rs:137:9 13: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>> at ./compiler/rustc_span/src/lib.rs:156:21 14: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:176:17 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. error: the compiler unexpectedly panicked. This is a bug note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: please make sure that you have updated to the latest nightly note: please attach the file at `/Users/keljonathan/code/rust/rustc-ice-2026-08-25T22_23_11-1423.txt` to your bug report note: rustc 1.100.0-dev running on aarch64-apple-darwin note: compiler flags: -C rpath -C debuginfo=0 -Z unstable-options query stack during panic: end of query stack ```

…or, r=nnethercote Make the LLVM version mismatch ICE a fatal error It was pointed out to me that the diatnostic in rust-lang#161788 has the usual ICE messages about how this is a bug and we'd appreciate a report. But it isn't, and a fatal error is a better way to report the problem. Manually tested on MacOS: ``` $ export DYLD_LIBRARY_PATH=/opt/homebrew/opt/llvm@21/lib $ rustc +stage1 --print=sysroot error: LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 21.1.8 was found at /opt/homebrew/Cellar/llvm@21/21.1.8/lib/libLLVM.dylib $ unset DYLD_LIBRARY_PATH $ rustc +stage1 --print=sysroot /Users/ben.kimock/rust/build/aarch64-apple-darwin/stage1 ```

@nnethercote

…er, r=nnethercote _ an unused parameter Followup to rust-lang#161788 addressing review feedback. r? @nnethercote @bors rollup

jnkel added 2 commits August 25, 2026 11:22

Check to ensure we're running against the correct LLVM version

dbea269

Look up and print path to wrong LLVM version

5841e10

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jnkel mentioned this pull request Aug 30, 2026

rustc --print=sysroot gives SIGSEGV on nightly #162013

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saethlin added beta-nominated Nominated for backporting to the compiler in the beta channel. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 30, 2026

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Rollup of 6 pull requests #162021

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Rollup of 8 pull requests #162022

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Rollup of 11 pull requests #162024

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Rollup of 11 pull requests #162025

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Rollup of 11 pull requests #162028

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rust-bors Bot merged commit 6f607f4 into rust-lang:main Aug 31, 2026
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Make the LLVM version mismatch ICE a fatal error #162034

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jnkel mentioned this pull request Aug 31, 2026

_ an unused parameter #162043

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Check to ensure we're running against the correct LLVM version - #161788

Check to ensure we're running against the correct LLVM version#161788
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