----- Original Message ----- From: "Steve Wills" <swi...@freebsd.org>
To: "Andriy Gapon" <a...@freebsd.org>
Cc: <curr...@freebsd.org>; <f...@freebsd.org>
Sent: Friday, October 10, 2014 2:27 AM
Subject: Re: zfs hang

On Wed, Oct 08, 2014 at 08:55:26AM +0300, Andriy Gapon wrote:
On 08/10/2014 03:40, Steve Wills wrote:
> Hi,
> > Not sure which thread this belongs to, but I have a zfs hang on one of my boxes
> running r272152. Running procstat -kka looks like:
> > http://pastebin.com/szZZP8Tf > > My zpool commands seem to be hung in spa_errlog_lock while others are hung in
> zfs_lookup. Suggestions?

There are several threads in zio_wait.  If this is their permanent state then
there is some problem with I/O somewhere below ZFS.

Thanks for the feedback. It seems one of my disks is dying, I rebooted and it
came up OK, but today I got:

 panic: I/O to pool 'rpool' appears to be hung on vdev guid ..... at 

I have screenshots and backtrace if anyone is interested. Dying drives
shouldn't cause panic, right?

Its the deadman timer kicking in so yes, thats expected.

The following sysctls control this behaviour if you want to try and recover:
vfs.zfs.deadman_synctime_ms: 1000000
vfs.zfs.deadman_checktime_ms: 5000
vfs.zfs.deadman_enabled: 1


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