ZFS deadlock report

[Walter Heukels]

Hello,

we are seeing occasional zfs hangs on our file servers.  The symptoms are these:

- no NFS response
- ‘zpool status’ works and shows no errors, but ‘zfs list’ hangs
- ls on the mounted filesystems hangs as well
- kernel version is FreeBSD 10.0-STABLE #0 r265916, GENERIC

According to https://wiki.freebsd.org/AvgZfsDeadlockDebug this looks like a possible deadlock.

Running processes: https://www.badexample.net/tmp/ps-aux.txt
procstat -kk -a output: https://www.badexample.net/tmp/procstat.txt

Kind regards,
Walter Heukels
CloudVPS