[Bug 229694] [zfs] unkillable "zpool scrub" in [tx->tx_sync_done_cv] state for damaged data

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229694

            Bug ID: 229694
           Summary: [zfs] unkillable "zpool scrub" in
                    [tx->tx_sync_done_cv] state for damaged data
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: stable at FreeBSD.org
          Reporter: eugen at freebsd.org
                CC: fs at FreeBSD.org

Hi!

"zpool scrub" may hang in an uninterruptable disk i/o state in case of damaged
pool data for 11.2-STABLE/amd64 r335757. This is easily reproduceable using
file-backed ZFS pool when files reside on another ("real") pool:

cd dir # resides on ZFS
size=100
rm -f vdev1 vdev2
truncate -s ${size}m vdev1 vdev2
zpool create ztest $(realpath vdev1)
zpool add ztest $(realpath vdev2)
# simulate data corruption
dd if=/dev/urandom of=vdev2 bs=1m count=${size}
zpool scrub ztest

The last command "zpool scrub" always hangs here:

load: 0.53  cmd: zpool 2130 [tx->tx_sync_done_cv] 34.59r 0.00u 0.00s 0% 3692k

"kill -9" cannot kill it.

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