[Bug 245186] zfs panic despite failmode=continue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245186

            Bug ID: 245186
           Summary: zfs panic despite failmode=continue
           Product: Base System
           Version: 12.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jfc at mit.edu

Created attachment 212861
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212861&action=edit
/var/log/messages around crash

I have a raidz2 ZFS pool with 5 spinning disks encrypted with geli.  One of the
disks is failing.  The system crashed twice in the past day.  One crash left no
record.  The other left a message:

reboot after panic: I/O to pool 'private' appears to be hung on vdev guid
9598894585529158357 at '/dev/da6.eli'.

I have failmode=continue on the pool.  I expect data to be discarded if the
drive returns a write error.  The system should not panic.

Kernel version is r359019.  See attached log for other system details.

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