[Bug 278414] Reproducible zpool(8) panic with 14.0-RELEASE amd64-zfs.raw VM-IMAGES

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278414

--- Comment #10 from Michael Dexter <editor@callfortesting.org> ---
At the risk of having the wrong crash dump... do note the attached 15-CURRENT
VM-IMAGE text dump:

KDB: stack backtrace:
#0 0xffffffff80b9009d at kdb_backtrace+0x5d
#1 0xffffffff80b431a2 at vpanic+0x132
#2 0xffffffff80b43063 at panic+0x43
#3 0xffffffff8100c85c at trap_fatal+0x40c
#4 0xffffffff8100c8af at trap_pfault+0x4f
#5 0xffffffff80fe3ad8 at calltrap+0x8
#6 0xffffffff81f3e9c3 at avl_remove+0x1a3
#7 0xffffffff820285c8 at dsl_scan_visit+0x2c8
#8 0xffffffff820275ad at dsl_scan_sync+0xc6d
#9 0xffffffff820541e6 at spa_sync+0xb36
#10 0xffffffff8206b3ab at txg_sync_thread+0x26b
#11 0xffffffff80afdb7f at fork_exit+0x7f
#12 0xffffffff80fe4b3e at fork_trampoline+0xe

Most follow this pattern.

Interesting: A clean 14.0 system is not exhibiting the issue. Only 14.0p2 and
14.0p5. I cannot yet say if the patch level plays a part in this, but I see
14.0p2 had some VFS changes:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275200

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