[Bug 203906] ZFS lockup, spa_namespace_lock

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

--- Comment #9 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to emz from comment #8)
Run kgdb and check what thread owns spa_namespace_lock.
The switch to that thread and get its backtrace.
That's in addition to capturing procstat -kk -a.

If you can afford some down time, it may also be useful to trigger a kernel
panic and save a crash dump.  The crash dump is most useful when you have
debugging symbols for the kernel and modules.

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