Creating non-sticky tasks in a @threads loop causes "Unlocking a lock in a different thread"

[vchuravy]

After fixing #31613 my mean test-code (enquing work from tid==1 and then servicing it else on the other worker threads), fails with a julia/src/locks.h:152: jl_mutex_unlock_nogc: Assertion lock->owner == jl_thread_self() && "Unlocking a lock in a different thread."'

chaos.jl

 Base.Threads.@threads for i in 1:Base.Threads.nthreads()
           if Base.Threads.threadid() == 1
             tasks = Task[]
             for i in 1:10
               t = Task(()->println("tid: ", Base.Threads.threadid()))
               t.sticky = false
               push!(tasks, t)
               schedule(t)
             end
             Base.sync_end(tasks)
           end
        end

To cite Jeff: The only parallel program one would ever want to execute is to print the threadid.

➜  julia ./julia chaos.jl
tid: 1julia: /home/vchuravy/src/julia/src/locks.h:152: jl_mutex_unlock_nogc: Assertion `lock->owner == jl_thread_self() && "Unlocking a lock in a different thread."' failed.

signal (6): Aborted
in expression starting at /home/vchuravy/builds/julia/chaos.jl:1
gsignal at /usr/lib/libc.so.6 (unknown line)
abort at /usr/lib/libc.so.6 (unknown line)
__assert_fail_base.cold.0 at /usr/lib/libc.so.6 (unknown line)
__assert_fail at /usr/lib/libc.so.6 (unknown line)
jl_mutex_unlock_nogc at /home/vchuravy/src/julia/src/locks.h:151 [inlined]
jl_eh_restore_state at /home/vchuravy/src/julia/src/rtutils.c:257
uv_write at ./stream.jl:875
unsafe_write at ./stream.jl:923
macro expansion at ./gcutils.jl:87 [inlined]
write at ./strings/io.jl:177 [inlined]
show at ./show.jl:586 [inlined]
print at ./strings/io.jl:37
unknown function (ip: 0x7f1074afa367)
jl_apply_generic at /home/vchuravy/src/julia/src/gf.c:2197
print at ./strings/io.jl:48
jl_apply_generic at /home/vchuravy/src/julia/src/gf.c:2197
jl_apply at /home/vchuravy/src/julia/src/julia.h:1604 [inlined]
jl_f__apply at /home/vchuravy/src/julia/src/builtins.c:563
println at ./strings/io.jl:75
jl_apply_generic at /home/vchuravy/src/julia/src/gf.c:2197
println at ./coreio.jl:4
unknown function (ip: 0x7f1074af9997)
jl_apply_generic at /home/vchuravy/src/julia/src/gf.c:2197
#3 at /home/vchuravy/builds/julia/chaos.jl:5
jl_apply_generic at /home/vchuravy/src/julia/src/gf.c:2197
jl_apply at /home/vchuravy/src/julia/src/julia.h:1604 [inlined]
start_task at /home/vchuravy/src/julia/src/task.c:583
unknown function (ip: 0xffffffffffffffff)
Allocations: 177483 (Pool: 177412; Big: 71); GC: 0
fish: “./julia chaos.jl” terminated by signal SIGABRT (Abort)