https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239566

--- Comment #1 from Andriy Gapon <a...@freebsd.org> ---
Some debugging information for the crash:
Unread portion of the kernel message buffer:
panic: solaris assert: avl_find(&scn->scn_queue, sds, &where) == ((void *)0)
(0xfffff80f108a1ac0 == 0x0), file:
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c, line: 1029
cpuid = 6
time = 1565487588
KDB: stack backtrace:
#0 0xffffffff80be7967 at kdb_backtrace+0x67
#1 0xffffffff80b9b543 at vpanic+0x1a3
#2 0xffffffff80b9b393 at panic+0x43
#3 0xffffffff829fe22c at assfail3+0x2c
#4 0xffffffff826cafbb at dsl_scan_ds_clone_swapped+0x1db
#5 0xffffffff826ba4e5 at dsl_dataset_clone_swap_sync_impl+0x8c5
#6 0xffffffff826a0de0 at dmu_recv_end_sync+0x310
#7 0xffffffff826c369e at dsl_sync_task_sync+0xae
#8 0xffffffff826c204b at dsl_pool_sync+0x3cb
#9 0xffffffff826eb635 at spa_sync+0xab5
#10 0xffffffff826f8f98 at txg_sync_thread+0x208
#11 0xffffffff80b5bf13 at fork_exit+0x83
#12 0xffffffff810506ae at fork_trampoline+0xe
Uptime: 14h3m53s
netdump: overwriting mbuf zone pointers
netdump in progress. searching for server...
netdumping to 10.10.5.2 (ac:1f:6b:48:3a:ac)
Dumping 21259 out of 196556
MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at ./machine/pcpu.h:234
234             struct thread *td;
(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:234
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:366
#2  0xffffffff80b9b12b in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:446
#3  0xffffffff80b9b5a3 in vpanic (fmt=<optimized out>, ap=0xfffffe0171b705c0)
at /usr/src/sys/kern/kern_shutdown.c:872
#4  0xffffffff80b9b393 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:799
#5  0xffffffff829fe22c in assfail3 (a=<unavailable>, lv=<unavailable>,
op=<unavailable>, rv=<unavailable>, f=<unavailable>, l=<optimized out>) at
/usr/src/sys/cddl/compat/opensolaris/kern/opensolaris_cmn_err.c:91
#6  0xffffffff826cafbb in scan_ds_queue_insert (scn=<optimized out>,
dsobj=85951, txg=1) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c:1029
#7  dsl_scan_ds_clone_swapped (ds1=<optimized out>, ds2=<optimized out>,
tx=0xfffff8013b108b00) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c:2036
#8  0xffffffff826ba4e5 in dsl_dataset_clone_swap_sync_impl
(clone=0xfffff8186d34f800, origin_head=0xfffff80bf0b90800, tx=<optimized out>)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c:3663
#9  0xffffffff826a0de0 in dmu_recv_end_sync (arg=0xfffffe0171b93510,
tx=0xfffff8013b108b00) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c:3302
#10 0xffffffff826c369e in dsl_sync_task_sync (dst=0xfffffe0171b932e8,
tx=0xfffff8013b108b00) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_synctask.c:234
#11 0xffffffff826c204b in dsl_pool_sync (dp=<optimized out>, txg=<optimized
out>) at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c:819
#12 0xffffffff826eb635 in spa_sync (spa=<optimized out>, txg=<optimized out>)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c:8088
#13 0xffffffff826f8f98 in txg_sync_thread (arg=0xfffff80106632800) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c:543
#14 0xffffffff80b5bf13 in fork_exit (callout=0xffffffff826f8d90
<txg_sync_thread>, arg=0xfffff80106632800, frame=0xfffffe0171b70c00) at
/usr/src/sys/kern/kern_fork.c:1057
#15 <signal handler called>
(kgdb) fr 8
#8  0xffffffff826ba4e5 in dsl_dataset_clone_swap_sync_impl
(clone=0xfffff8186d34f800, origin_head=0xfffff80bf0b90800, tx=<optimized out>)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c:3663
(kgdb) p clone->ds_object
$1 = 85951
(kgdb) p origin_head->ds_object
$2 = 85918

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