[Bug 253890] [zfs] panic: Assertion lock == sq->sq_lock when sending ZFS snapshot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253890

Alan Somers <asomers@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |asomers@FreeBSD.org

--- Comment #2 from Alan Somers <asomers@FreeBSD.org> ---
I just experienced the same panic, though with a different stack trace.  In my
case I was using a build based on stable/13 from September-2021

panic: Assertion lock == sq->sq_lock failed at
/usr/home/asomers/src/github/Axcient/freebsd-src/sys/kern/subr_sleepqueue.c:371
cpuid = 21
time = 1651466741
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0a7468ad20
vpanic() at vpanic+0x1cc/frame 0xfffffe0a7468ad80
panic() at panic+0x43/frame 0xfffffe0a7468ade0
sleepq_add() at sleepq_add+0x4ae/frame 0xfffffe0a7468ae40
_sleep() at _sleep+0x2b0/frame 0xfffffe0a7468aee0
taskqueue_quiesce() at taskqueue_quiesce+0x1f3/frame 0xfffffe0a7468af50
dmu_objset_sync() at dmu_objset_sync+0x57a/frame 0xfffffe0a7468b030
dsl_dataset_sync() at dsl_dataset_sync+0x218/frame 0xfffffe0a7468b080
dsl_pool_sync() at dsl_pool_sync+0x17f/frame 0xfffffe0a7468b110
spa_sync() at spa_sync+0x15ee/frame 0xfffffe0a7468b350
txg_sync_thread() at txg_sync_thread+0x346/frame 0xfffffe0a7468b430
fork_exit() at fork_exit+0xb3/frame 0xfffffe0a7468b470
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0a7468b470
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

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