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Description
(rr trace available upon request)
Looks like _jl_mutex_wait fails to enter a gc-safe region inside when jl_running_under_rr is true, causing deadlocks in this situation:
# this thread (tid 50) wants GC to start (waiting on tid 1 to enter gc-safe)
unknown function (ip: 0x7fbe26a5d115) at /lib/x86_64-linux-gnu/libc.so.6
pthread_cond_wait at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
uv_cond_wait at /workspace/srcdir/libuv/src/unix/thread.c:822
jl_gc_wait_for_the_world at /home/vtjnash/julia1/src/safepoint.c:154
ijl_gc_collect at /home/vtjnash/julia1/src/gc-stock.c:3362
gc at ./gcutils.jl:133 [inlined]
cl at /home/vtjnash/julia1/test/threads.jl:466
#70 at /home/vtjnash/julia1/test/threads.jl:488
unknown function (ip: 0x7fbe0cb75dd5) at (unknown file)
unknown function (ip: 0x7fbe26a60ac2) at /lib/x86_64-linux-gnu/libc.so.6
clone at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: (nil)) at (unknown file)
unknown function (ip: 0x7fbe26a5d115) at /lib/x86_64-linux-gnu/libc.so.6
pthread_cond_wait at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
uv_cond_wait at /workspace/srcdir/libuv/src/unix/thread.c:822
ijl_task_get_next at /home/vtjnash/julia1/src/scheduler.c:520
poptask at ./task.jl:1163
wait at ./task.jl:1172
#wait#550 at ./condition.jl:141
wait at ./condition.jl:136 [inlined]
take_buffered at ./channels.jl:533
take! at ./channels.jl:527 [inlined]
#56 at /home/vtjnash/julia1/test/threads.jl:446
init_perthread at ./lock.jl:789
getindex at ./lock.jl:746 [inlined]
OncePerThread at ./lock.jl:739 [inlined]
cl at /home/vtjnash/julia1/test/threads.jl:469
#70 at /home/vtjnash/julia1/test/threads.jl:488
unknown function (ip: 0x7fbe0cb75dd5) at (unknown file)
unknown function (ip: 0x7fbe26a60ac2) at /lib/x86_64-linux-gnu/libc.so.6
clone at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: (nil)) at (unknown file)
# this thread (tid 1) wants the iolock to finish running finalizers (waiting on tid 0 to release)
unknown function (ip: 0x7fbe26a5d115) at /lib/x86_64-linux-gnu/libc.so.6
pthread_cond_wait at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
uv_cond_wait at /workspace/srcdir/libuv/src/unix/thread.c:822
_jl_mutex_wait at /home/vtjnash/julia1/src/threading.c:925
_jl_mutex_lock at /home/vtjnash/julia1/src/threading.c:957
jl_mutex_lock at /home/vtjnash/julia1/src/julia_locks.h:65 [inlined]
JL_UV_LOCK at /home/vtjnash/julia1/src/jl_uv.c:137 [inlined]
ijl_iolock_begin at /home/vtjnash/julia1/src/jl_uv.c:147
iolock_begin at ./libuv.jl:48 [inlined]
uvfinalize at ./asyncevent.jl:200
jfptr_uvfinalize_97523 at /home/vtjnash/julia1/usr/lib/julia/sys.so (unknown line)
_jl_invoke at /home/vtjnash/julia1/src/gf.c:3306 [inlined]
ijl_apply_generic at /home/vtjnash/julia1/src/gf.c:3494
run_finalizer at /home/vtjnash/julia1/src/gc-common.c:180
jl_gc_run_finalizers_in_list at /home/vtjnash/julia1/src/gc-common.c:270
run_finalizers at /home/vtjnash/julia1/src/gc-common.c:316
ijl_gc_collect at /home/vtjnash/julia1/src/gc-stock.c:3400
gc at ./gcutils.jl:133 [inlined]
cl at /home/vtjnash/julia1/test/threads.jl:466
#70 at /home/vtjnash/julia1/test/threads.jl:488
unknown function (ip: 0x7fbe0cb75dd5) at (unknown file)
unknown function (ip: 0x7fbe26a60ac2) at /lib/x86_64-linux-gnu/libc.so.6
clone at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: (nil)) at (unknown file)
# this thread (tid 0) is holding the iolock waiting to hear that gc is finished (waiting on tid 50)
unknown function (ip: 0x7fbe26a5d115) at /lib/x86_64-linux-gnu/libc.so.6
pthread_cond_wait at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
uv_cond_wait at /workspace/srcdir/libuv/src/unix/thread.c:822
jl_safepoint_wait_gc at /home/vtjnash/julia1/src/safepoint.c:246
jl_set_gc_and_wait at /home/vtjnash/julia1/src/safepoint.c:226
segv_handler at /home/vtjnash/julia1/src/signals-unix.c:395 [inlined]
segv_handler at /home/vtjnash/julia1/src/signals-unix.c:381
unknown function (ip: 0x7fbe26a0e51f) at /lib/x86_64-linux-gnu/libc.so.6
ijl_gc_safepoint at /home/vtjnash/julia1/src/jlapi.c:740
ijl_task_get_next at /home/vtjnash/julia1/src/scheduler.c:456
poptask at ./task.jl:1163
wait at ./task.jl:1172
#wait#550 at ./condition.jl:141
wait at ./condition.jl:136 [inlined]
take_buffered at ./channels.jl:533
take! at ./channels.jl:527
unknown function (ip: 0x7fbe0cb707f2) at (unknown file)
_jl_invoke at /home/vtjnash/julia1/src/gf.c:3306 [inlined]
ijl_apply_generic at /home/vtjnash/julia1/src/gf.c:3494
jl_apply at /home/vtjnash/julia1/src/julia.h:2240 [inlined]
do_call at /home/vtjnash/julia1/src/interpreter.c:125
eval_value at /home/vtjnash/julia1/src/interpreter.c:223
eval_body at /home/vtjnash/julia1/src/interpreter.c:567
eval_body at /home/vtjnash/julia1/src/interpreter.c:544
jl_interpret_toplevel_thunk at /home/vtjnash/julia1/src/interpreter.c:894
jl_toplevel_eval_flex at /home/vtjnash/julia1/src/toplevel.c:1065
jl_toplevel_eval_flex at /home/vtjnash/julia1/src/toplevel.c:1005
ijl_toplevel_eval at /home/vtjnash/julia1/src/toplevel.c:1076
ijl_toplevel_eval_in at /home/vtjnash/julia1/src/toplevel.c:1118
eval at ./boot.jl:460
include_string at ./loading.jl:2839
_jl_invoke at /home/vtjnash/julia1/src/gf.c:3306 [inlined]
ijl_apply_generic at /home/vtjnash/julia1/src/gf.c:3494
_include at ./loading.jl:2899
include at ./Base.jl:300
macro expansion at /home/vtjnash/julia1/test/testdefs.jl:33 [inlined]
macro expansion at /home/vtjnash/julia1/usr/share/julia/stdlib/v1.12/Test/src/Test.jl:1700 [inlined]
macro expansion at /home/vtjnash/julia1/test/testdefs.jl:26 [inlined]
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