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

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

            Bug ID: 235640
           Summary: panic: mutex pipe mutex not owned at
                    ../../../kern/sys_pipe.c:1748
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: stress2
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

panic: mutex pipe mutex not owned at ../../../kern/sys_pipe.c:1748
cpuid = 2
time = 1549792086
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00b8acc350
vpanic() at vpanic+0x20c/frame 0xfffffe00b8acc3b0
panic() at panic+0x43/frame 0xfffffe00b8acc410
__mtx_assert() at __mtx_assert+0x174/frame 0xfffffe00b8acc450
filt_pipewrite() at filt_pipewrite+0x38/frame 0xfffffe00b8acc480
kqueue_register() at kqueue_register+0xec2/frame 0xfffffe00b8acc520
kqueue_kevent() at kqueue_kevent+0x10b/frame 0xfffffe00b8acc800
kern_kevent_fp() at kern_kevent_fp+0xbc/frame 0xfffffe00b8acc850
kern_kevent() at kern_kevent+0xe2/frame 0xfffffe00b8acc8b0
kern_kevent_generic() at kern_kevent_generic+0xb4/frame 0xfffffe00b8acc910
sys_kevent() at sys_kevent+0x72/frame 0xfffffe00b8acc980
amd64_syscall() at amd64_syscall+0x45e/frame 0xfffffe00b8accab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00b8accab0
--- syscall (560, FreeBSD ELF64, sys_kevent), rip = 0x80043055a, rsp =
0x7fffdfffde88, rbp = 0x7fffdfffded0 ---
KDB: enter: panic
[ thread pid 9322 tid 101144 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why
db> x/s version
version:        FreeBSD 13.0-CURRENT #0 r343931: Sat Feb  9 12:49:52 CET
2019\012    pho at mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO\012
db>

A slightly older stack trace is found here:
https://people.freebsd.org/~pho/stress/log/kevent13.txt

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