Assertion ret == 0 failed in sigfd_free_sigevent with libevent-2.2.1 #3572
Description
Issue description
After rebuilding tmux against libevent-2.2.1-alpha (we're testing to catch early issues), tmux is crashing immediately after opening a new session, with the following assertion:
/tmp/portage/dev-libs/libevent-2.2.1-r1/work/libevent-2.2.1-alpha-dev/signalfd.c:77: Assertion ret == 0 failed in sigfd_free_sigevent
Note that the assertion message appears on the new pty and disappears immediately as tmux exits. I have been able to capture it using asciinema. Curious enough, it doesn't appear at all if I pass -v (tmux just exits immediately with empty screen).
I can reproduce with tmux 3.3a and git (0eb5d25), against libevent 2.2.1 and git (libevent/libevent@2112c39).
Required information
Please provide the following information:
- tmux version (
tmux -V):tmux next-3.4 - Platform (
uname -sp):Linux AMD Ryzen 5 3600 6-Core Processor - $TERM inside and outside of tmux (
echo $TERM):xterm-256coloroutside, can't get inside since it crashes ;-) - Logs from tmux (
tmux kill-server; tmux -vv new): follow
tmux-client-150783.log
tmux-out-150785.log
tmux-server-150785.log
Backtrace:
(gdb) bt
#0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1 0x00007fa50cf2200f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
#2 0x00007fa50ced2ef2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3 0x00007fa50cebc4ad in __GI_abort () at abort.c:79
#4 0x00007fa50d19cc2f in event_exit (errcode=-559030611) at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/log.c:96
#5 0x00007fa50d19d07e in event_errx (eval=-559030611, fmt=0x7fa50d1a6130 "%s:%d: Assertion %s failed in %s")
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/log.c:153
#6 0x00007fa50d1a049d in sigfd_free_sigevent (base=0x564a74002c90, signo=2)
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/signalfd.c:77
#7 0x00007fa50d1a0b3d in sigfd_del (base=0x564a74002c90, signo=2, old=0, events=8, p=0x0)
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/signalfd.c:201
#8 0x00007fa50d194c2a in evmap_signal_del_ (base=0x564a74002c90, sig=2, ev=0x564a74005548)
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/evmap.c:493
#9 0x00007fa50d19052e in event_del_nolock_ (ev=0x564a74005548, blocking=2)
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/event.c:2930
#10 0x00007fa50d190211 in event_del_ (ev=0x564a74005548, blocking=2)
at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/event.c:2846
#11 0x00007fa50d190266 in event_del (ev=0x564a74005548) at /usr/src/debug/dev-libs/libevent-9999/libevent-9999/event.c:2855
#12 0x0000564a727f6a79 in proc_clear_signals (tp=0x564a74005530, defaults=1) at proc.c:280
#13 0x0000564a72815878 in spawn_pane (sc=0x7fffb9225c00, cause=0x7fffb9225b18) at spawn.c:432
#14 0x0000564a728149c7 in spawn_window (sc=0x7fffb9225c00, cause=0x7fffb9225b18) at spawn.c:171
#15 0x0000564a72799337 in cmd_new_session_exec (self=0x564a74019100, item=0x564a7405d240) at cmd-new-session.c:294
#16 0x0000564a727a0e78 in cmdq_fire_command (item=0x564a7405d240) at cmd-queue.c:647
#17 0x0000564a727a12d2 in cmdq_next (c=0x564a740778b0) at cmd-queue.c:763
#18 0x0000564a7280f623 in server_loop () at server.c:273
#19 0x0000564a727f65e9 in proc_loop (tp=0x564a74005530, loopcb=0x564a7280f5cf <server_loop>) at proc.c:217
#20 0x0000564a7280f5b4 in server_start (client=0x564a740031a0, flags=402718720, base=0x564a74002c90, lockfd=11,
lockfile=0x564a74005500 "S") at server.c:252
#21 0x0000564a7278a821 in client_connect (base=0x564a74002c90, path=0x564a74002c70 "/tmp/tmux-0/default", flags=402718720)
at client.c:164
#22 0x0000564a7278ac40 in client_main (base=0x564a74002c90, argc=0, argv=0x7fffb9226350, flags=402718720, feat=0) at client.c:293
#23 0x0000564a7281e397 in main (argc=0, argv=0x7fffb9226350) at tmux.c:519