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Message-ID: <20201030185205.GA10849@arya.arvanta.net> Date: Fri, 30 Oct 2020 19:52:05 +0100 From: Milan P. Stanić <mps@...anta.net> To: musl@...ts.openwall.com Subject: Re: [PATCH v2] MT fork On Fri, 2020-10-30 at 08:47, Milan P. Stanić wrote: > On Thu, 2020-10-29 at 19:27, Rich Felker wrote: > > On Fri, Oct 30, 2020 at 12:00:07AM +0100, Milan P. Stanić wrote: > > > On Thu, 2020-10-29 at 23:21, Szabolcs Nagy wrote: > > > > * Milan P. Stanić <mps@...anta.net> [2020-10-29 21:55:41 +0100]: > > > > > On Thu, 2020-10-29 at 17:13, Szabolcs Nagy wrote: > > > > > > * Milan P. Stanić <mps@...anta.net> [2020-10-29 00:06:10 +0100]: > > > > > > > > > > > > > > Applied this patch on top of current musl master, build it on Alpine and > > > > > > > installed. > > > > > > > > > > > > > > Tested by building ruby lang. Works fine. > > > > > > > Also tested building zig lang, works fine. > > > > > > > But crystal lang builds fine, but running it hangs. strace shows: > > > > > > > ------------- > > > > > > > [pid 5573] futex(0x7efc50fba9e4, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...> > > > > > > > [pid 5568] futex(0x7efc5118f984, FUTEX_REQUEUE_PRIVATE, 0, 1, 0x7efc514b67a4) = 1 > > > > > > > [pid 5568] futex(0x7efc514b67a4, FUTEX_WAKE_PRIVATE, 1) = 1 > > > > > > > [pid 5571] <... futex resumed>) = 0 > > > > > > > [pid 5568] futex(0x7efc511099e4, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...> > > > > > > > [pid 5571] futex(0x7efc510409e4, FUTEX_WAIT_PRIVATE, 2, NULL > > > > > > > ------------- > > > > > > > where it hangs. > > > > > > > > > > > > try to attach gdb to the process that hang and do > > > > > > > > > > > > thread apply all bt > > > > > > > > > > > > (make sure musl-dbg is installed) > > > > > > > > > > I cannot attach gdb for running process because my Alpine development > > > > > boxes are lxc containers where CAP_SYS_PTRACE is not enabled afaik. > > > > > > > > there should be a way to config lxc to allow ptrace. > > > > > > > > > I installed musl-dbg and run program with 'gdb .build/crystal' and result is: > > > > > ---------- > > > > > Reading symbols from .build/crystal... > > > > > (gdb) run > > > > > Starting program: /home/mps/aports/community/crystal/src/crystal-0.35.1/.build/crystal > > > > > > > > > > Program received signal SIGSEGV, Segmentation fault. > > > > > > > > hm segfault is not a hang.. > > > > > > > > libgc tries to find stack bounds by registering a segfault handler > > > > and walking stack pages until it triggers. > > > > > > > > gdb stops at signals, this one is harmless, you should just continue > > > > until you see a hang, then interrupt and bt. > > > > > > I did continue now and stopped it when it hangs. Attached is gdb log > > > produced by 'thread apply all bt' > > > > Next time please don't gzip so it's readable and repliable. I've > > expanded it out here though: > > > > > Starting program: /home/mps/aports/community/crystal/src/crystal-0.35.1/.build/crystal > > > > > > Program received signal SIGSEGV, Segmentation fault. > > > 0x00007ffff401c463 in GC_find_limit_with_bound () from /usr/lib/libgc.so.1 > > > Continuing. > > > [New LWP 18867] > > > [New LWP 18868] > > > [New LWP 18869] > > > [New LWP 18870] > > > [New LWP 18871] > > > [New LWP 18872] > > > [New LWP 18873] > > > [New LWP 18874] > > > [New LWP 18875] > > > [New LWP 18876] > > > [New LWP 18877] > > > [New LWP 18878] > > > [New LWP 18879] > > > [New LWP 18880] > > > [New LWP 18881] > > > > > > Thread 1 "crystal" received signal SIGINT, Interrupt. > > > __syscall_cp_c (nr=202, u=140737488349316, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > 61 ./arch/x86_64/syscall_arch.h: No such file or directory. > > > > > > Thread 16 (LWP 18881): > > > #0 __syscall_cp_c (nr=202, u=140737280690660, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff39f49e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff39f49e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3a04aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 15 (LWP 18880): > > > #0 __syscall_cp_c (nr=202, u=140737280965092, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3a379e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3a379e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3a47aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 14 (LWP 18879): > > > #0 __syscall_cp_c (nr=202, u=140737281239524, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3a7a9e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3a7a9e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3a8aaa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 13 (LWP 18878): > > > #0 __syscall_cp_c (nr=202, u=140737281513956, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3abd9e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3abd9e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3acdaa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 12 (LWP 18877): > > > #0 __syscall_cp_c (nr=202, u=140737281788388, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3b009e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3b009e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3b10aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 11 (LWP 18876): > > > #0 __syscall_cp_c (nr=202, u=140737282062820, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3b439e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3b439e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3b53aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 10 (LWP 18875): > > > #0 __syscall_cp_c (nr=202, u=140737282337252, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3b869e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3b869e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3b96aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 9 (LWP 18874): > > > #0 __syscall_cp_c (nr=202, u=140737282611684, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3bc99e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3bc99e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3bd9aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 8 (LWP 18873): > > > #0 __syscall_cp_c (nr=202, u=140737282886020, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3c0c984) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3c0c984, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40186ca in GC_mark_local () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40188f4 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #8 0x00007ffff7fb9df7 in start (p=0x7ffff3c1caa0) at src/thread/pthread_create.c:196 > > > #9 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 7 (LWP 18872): > > > #0 __syscall_cp_c (nr=202, u=140737283160548, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3c4f9e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3c4f9e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3c5faa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 6 (LWP 18871): > > > #0 __syscall_cp_c (nr=202, u=140737283434980, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3c929e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3c929e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3ca2aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 5 (LWP 18870): > > > #0 __syscall_cp_c (nr=202, u=140737283709412, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3cd59e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3cd59e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3ce5aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 4 (LWP 18869): > > > #0 __syscall_cp_c (nr=202, u=140737283983844, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3d189e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3d189e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3d28aa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 3 (LWP 18868): > > > #0 __syscall_cp_c (nr=202, u=140737284258276, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3d5b9e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3d5b9e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3d6baa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 2 (LWP 18867): > > > #0 __syscall_cp_c (nr=202, u=140737284532708, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7ffff3d9e9e4) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7ffff3d9e9e4, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff40188b9 in GC_help_marker () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff40206db in GC_mark_thread () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff7fb9df7 in start (p=0x7ffff3daeaa0) at src/thread/pthread_create.c:196 > > > #8 0x00007ffff7fbbf93 in __clone () at src/thread/x86_64/clone.s:22 > > > Backtrace stopped: frame did not save the PC > > > > > > Thread 1 (LWP 18859): > > > #0 __syscall_cp_c (nr=202, u=140737488349316, v=128, w=2, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 > > > #1 0x00007ffff7fb8937 in __futex4_cp (to=0x0, val=2, op=128, addr=0x7fffffffe884) at src/thread/__timedwait.c:52 > > > #2 __timedwait_cp (addr=addr@...ry=0x7fffffffe884, val=val@...ry=2, clk=clk@...ry=0, at=at@...ry=0x0, priv=128, priv@...ry=1) at src/thread/__timedwait.c:52 > > > #3 0x00007ffff7fb9740 in __pthread_cond_timedwait (c=0x7ffff403fba0, m=0x7ffff403f7a0, ts=0x0) at src/thread/pthread_cond_timedwait.c:100 > > > #4 0x00007ffff40206fd in GC_wait_marker () from /usr/lib/libgc.so.1 > > > #5 0x00007ffff4018852 in GC_do_parallel_mark () from /usr/lib/libgc.so.1 > > > #6 0x00007ffff401937c in GC_mark_some () from /usr/lib/libgc.so.1 > > > #7 0x00007ffff4010e5a in GC_stopped_mark () from /usr/lib/libgc.so.1 > > > #8 0x00007ffff40114d4 in GC_try_to_collect_inner () from /usr/lib/libgc.so.1 > > > #9 0x00007ffff401b47f in GC_init () from /usr/lib/libgc.so.1 > > > #10 0x00005555555668d8 in init () at /home/mps/aports/community/crystal/src/crystal-0.35.1/src/gc/boehm.cr:127 > > > #11 main () at /home/mps/aports/community/crystal/src/crystal-0.35.1/src/crystal/main.cr:35 > > > #12 main () at /home/mps/aports/community/crystal/src/crystal-0.35.1/src/crystal/main.cr:114 > > > > OK, I'm looking at Boehm-GC's GC_wait_marker and this function is > > utterly bogus. It's using a condition variable without a predicate, > > and the corresponding broadcast operation runs without the lock held, > > so it's inherently subject both to spurious wakes and missed wakes. > > Here's the source: > > > > https://github.com/ivmai/bdwgc/blob/57b97be07c514fcc4b608b13768fd2bf637a5899/pthread_support.c#L2374 > > > > This code is only used if built with PARALLEL_MARK defined, and > > obviously does not and cannot work, so I think the best solution is > > just figuring out how to turn off PARALLEL_MARK. > > > > Do you have reason to believe the problem here has anything to do with > > the MT-fork patch? Was it maybe just hanging somewhere earlier without > > the patch, and now hanging on an independent bug? > > It doesn't hangs with musl 1.2.1, but hangs on master branch with > mt-fork applied to it. > > Also I tested with w3m browser and I see same behavior and same > (similar) backtrace. > > Interesting thing is that it doesn't hangs on every invocations of > programs linked with libgc, sometimes programs work sometimes they > hangs. Rebuilding 'gc' with '--disable-parallel-mark' fixes hangs. Not sure that is proper fix but for now it 'good' to not block next Alpine release. -- Regards
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