[Bug 203906] ZFS lockup, spa_namespace_lock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203906

--- Comment #7 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to emz from comment #6)
A rather wild guess, but I suspect that it may had to do with the hardware.
I see that ZFS was just blocked waiting for I/O.  I do not see intrinsic
problems with it.
Maybe a disk took a nap or a command like TRIM blocked its operation for a long
time or something of that nature.
A suspicious thread:
    0 101671 kernel              zio_free_issue_3_0  _mtx_lock_spin_cookie+0xc1
callout_lock+0xcb callout_reset_sbt_on+0x79 mprsas_action+0xf2d
xpt_run_devq+0x48a xpt_action_default+0x8fc dastart+0x2f3 xpt_run_allocq+0x173
dastrategy+0x8d g_disk_start+0x34f g_io_request+0x2a7 zio_vdev_io_start+0x2ae
zio_execute+0xac zio_nowait+0xcb vdev_raidz_io_start+0x6cc
zio_vdev_io_start+0x2ae zio_execute+0xac zio_nowait+0xcb

Try to examine your system logs, maybe RAID event log too.

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