[Bug 229614] ZFS lockup in zil_commit_impl

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229614

--- Comment #34 from Andreas Sommer <andreas.sommer87 at googlemail.com> ---
Here's a different stack trace I found:

$ sudo procstat -kk 92301
  PID    TID COMM                TDNAME              KSTACK
92301 100454 sync                -                   mi_switch+0xe6
critical_exit+0x6d xen_intr_handle_upcall+0x1b7 Xxen_intr_upcall+0xa5
vputx+0x2ea zfs_zget+0x1aa zfs_get_data+0x3c zil_commit_impl+0xa9a
zfs_sync+0xa6 sys_sync+0x116 amd64_syscall+0xa38 fast_syscall_common+0x101

This sync process hung (I'm running find, sync and other stuff in a loop to
trigger the issue faster). Later I seemingly couldn't run procstat on (the
still existing) PID 92301 anymore... `procstat` hangs after outputting column
headers and my SSH connection goes away i.e. instance has crashed.

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