simplify Loop slightly #4
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westonpace
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Apr 7, 2021
From a deadlocked run... ``` #0 0x00007f8a5d48dccd in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f8a5d486f05 in pthread_mutex_lock () from /lib64/libpthread.so.0 #2 0x00007f8a566e7e89 in arrow::internal::FnOnce<void ()>::FnImpl<arrow::Future<Aws::Utils::Outcome<Aws::S3::Model::ListObjectsV2Result, Aws::S3::S3Error> >::Callback<arrow::fs::(anonymous namespace)::TreeWalker::ListObjectsV2Handler> >::invoke() () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #3 0x00007f8a5650efa0 in arrow::FutureImpl::AddCallback(arrow::internal::FnOnce<void ()>) () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #4 0x00007f8a566e67a9 in arrow::fs::(anonymous namespace)::TreeWalker::ListObjectsV2Handler::SpawnListObjectsV2() () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #5 0x00007f8a566e723f in arrow::fs::(anonymous namespace)::TreeWalker::WalkChild(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int) () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #6 0x00007f8a566e827d in arrow::internal::FnOnce<void ()>::FnImpl<arrow::Future<Aws::Utils::Outcome<Aws::S3::Model::ListObjectsV2Result, Aws::S3::S3Error> >::Callback<arrow::fs::(anonymous namespace)::TreeWalker::ListObjectsV2Handler> >::invoke() () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #7 0x00007f8a5650efa0 in arrow::FutureImpl::AddCallback(arrow::internal::FnOnce<void ()>) () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #8 0x00007f8a566e67a9 in arrow::fs::(anonymous namespace)::TreeWalker::ListObjectsV2Handler::SpawnListObjectsV2() () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #9 0x00007f8a566e723f in arrow::fs::(anonymous namespace)::TreeWalker::WalkChild(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int) () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so #10 0x00007f8a566e74b1 in arrow::fs::(anonymous namespace)::TreeWalker::DoWalk() () from /arrow/r/check/arrow.Rcheck/arrow/libs/arrow.so ``` The callback `ListObjectsV2Handler` is being called recursively and the mutex is non-reentrant thus deadlock. To fix it I got rid of the mutex on `TreeWalker` by using `arrow::util::internal::TaskGroup` instead of manually tracking the #/status of in-flight requests. Closes apache#9842 from westonpace/bugfix/arrow-12040 Lead-authored-by: Weston Pace <[email protected]> Co-authored-by: Antoine Pitrou <[email protected]> Signed-off-by: Antoine Pitrou <[email protected]>
westonpace
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Jun 16, 2021
Before change:
```
Direct leak of 65536 byte(s) in 1 object(s) allocated from:
#0 0x522f09 in
#1 0x7f28ae5826f4 in
#2 0x7f28ae57fa5d in
#3 0x7f28ae58cb0f in
#4 0x7f28ae58bda0 in
...
```
After change:
```
Direct leak of 65536 byte(s) in 1 object(s) allocated from:
#0 0x522f09 in posix_memalign (/build/cpp/debug/arrow-dataset-file-csv-test+0x522f09)
#1 0x7f28ae5826f4 in arrow::(anonymous namespace)::SystemAllocator::AllocateAligned(long, unsigned char**) /arrow/cpp/src/arrow/memory_pool.cc:213:24
#2 0x7f28ae57fa5d in arrow::BaseMemoryPoolImpl<arrow::(anonymous namespace)::SystemAllocator>::Allocate(long, unsigned char**) /arrow/cpp/src/arrow/memory_pool.cc:405:5
#3 0x7f28ae58cb0f in arrow::PoolBuffer::Reserve(long) /arrow/cpp/src/arrow/memory_pool.cc:717:9
#4 0x7f28ae58bda0 in arrow::PoolBuffer::Resize(long, bool) /arrow/cpp/src/arrow/memory_pool.cc:741:7
...
```
Closes apache#10498 from westonpace/feature/ARROW-13027--c-fix-asan-stack-traces-in-ci
Authored-by: Weston Pace <[email protected]>
Signed-off-by: Antoine Pitrou <[email protected]>
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