[Bug 235640] panic: mutex pipe mutex not owned at ../../../kern/sys_pipe.c:1748

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235640

--- Comment #2 from Peter Holm <pho at FreeBSD.org> ---
(In reply to Mark Johnston from comment #1)

Test scenario: misc/kevent13.sh
I just updated the test scenario to include VM pressure.

root at t2:~pho/stress2/misc # uname -a
FreeBSD t2.osted.lan 13.0-CURRENT FreeBSD 13.0-CURRENT #2 r343705M: Sun Feb 10
19:11:22 CET 2019     pho at t2.osted.lan:/usr/src/sys/amd64/compile/PHO  amd64
root at t2:~pho/stress2/misc # ./kevent13.sh 
panic: mutex pipe mutex not owned at ../../../kern/sys_pipe.c:1748
cpuid = 14
time = 1549896871
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00d70b33d0
vpanic() at vpanic+0x1b4/frame 0xfffffe00d70b3430
panic() at panic+0x43/frame 0xfffffe00d70b3490
__mtx_assert() at __mtx_assert+0xb4/frame 0xfffffe00d70b34a0
filt_pipewrite() at filt_pipewrite+0x30/frame 0xfffffe00d70b34c0
kqueue_register() at kqueue_register+0xa03/frame 0xfffffe00d70b3550
kqueue_kevent() at kqueue_kevent+0xa2/frame 0xfffffe00d70b3820
kern_kevent_fp() at kern_kevent_fp+0x97/frame 0xfffffe00d70b3870
kern_kevent() at kern_kevent+0x9f/frame 0xfffffe00d70b38d0
kern_kevent_generic() at kern_kevent_generic+0x70/frame 0xfffffe00d70b3930
sys_kevent() at sys_kevent+0x61/frame 0xfffffe00d70b3990
amd64_syscall() at amd64_syscall+0x291/frame 0xfffffe00d70b3ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00d70b3ab0
--- syscall (560, FreeBSD ELF64, sys_kevent), rip = 0x80043055a, rsp =
0x7fffdfffde88, rbp = 0x7fffdfffded0 ---
KDB: enter: panic
[ thread pid 1369 tid 101232 ]
Stopped at      kdb_enter+0x3b: movq    $0,kdb_why
db>

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