[Bug 228750] panic on zfs mirror removal

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228750

--- Comment #4 from Roger Hammerstein <cheeky.m at live.com> ---
On 12.0-ALPHA5 today, r338620M, the panic today is

ZFS storage pool version: features support (5000)
panic: solaris assert: rc-rc_count == number, file:
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c, line: 94
cpuid = 2
time = 1536840299
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0091cb87b0
vpanic() at vpanic+0x1a3/frame 0xfffffe0091cb8810
panic() at panic+0x43/frame 0xfffffe091cb8870
assfail() at assfail+0x1a/frame 0xfffffe0091cb8880
refcount_destroy_many() at refcount_destroy_many+0x2b/frame 0xfffffe0091cb88b0
abd_free() at abd_free+0x18d/frame 0xfffffe0091cb88e0
spa_vdev_copy_segment_write_done() at
spa_vdev_copy_segment_write_done+0x20/frame 0xfffffe0091cb8910
zio_done() at zio_done+0xf21/frame 0xfffffe0091cb8990
zio_execute() at zio_execute+0x18c/frame 0xfffffe0091cb89e0
taskqueue_run_locked() at taskqueue_run_locked+0x10c/frame 0xfffffe0091cb8a40
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe0091cb8a70
fork_exit() at fork_exit+0x84/frame 0xfffffe0091cb8ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0091cb8ab0
--- trap 0, ripe = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 0 tid 100477 ]
Stopped at      kdb_enter+0x3b: movq      $0,kdb_why
db>

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