Date: Fri, 5 Nov 2021 17:39:35 +0100 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-fs@freebsd.org Subject: Re: ZFS operations hanging, but no visible errors? Message-ID: <20211105173935.7aa53269@fabiankeil.de> In-Reply-To: <B28E52F4-F475-4CF6-BE0C-F5C803AD5757@distal.com>
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Chris Ross <cross+freebsd@distal.com> wrote on 2021-11-05:
> Hey there. I have a server running FreeBSD 13.0-RELEASE,
> with a large ZFS zpool. I have a UFS mirror on hardware
> raid, then a bunch of JBOD disks in a pool. I recently
> added a new vdev to this pool, which may or may not be related.
>
> Today, I started an rsync of a large (100GB) file from
> the pool to another host. After a while (7%), it seemed
> no progres was being made. I tried to kill the rsync,
> which didn’t exit, or suspend. Now anything that touches
> the pool seems to hang. But, the system is otherwise
> functional, console shows no issues, the controller
> (via out-of-band management interface) shows all disks
> as having no errors or issues.
>
> Any idea what I should be looking for, and if there’s
> any way to recover it without reboot?
You can check with "procstat -kk" where the hanging
processes are stuck.
The output of:
dtrace -qn 'zfs-dbgmsg {printf("%Y: %s\n", walltimestamp, stringof(arg0))}'
could be useful as well.
Fabian
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