On 11/13/2014 03:49 PM, Chris Mason wrote:
On Thu, Nov 13, 2014 at 8:32 AM, Patrick Schmid <schmid@xxxxxxxxxxxx>
wrote:
Hi all,
we run a > 500 TiB backup system on iSCSI targets using 19 BTRFS
filesystems (the biggest of which is 110 TiB) on Ubuntu 14.04 LTS and
various kernel versions. Btrfs-Progs v3.17.1. The hardware is a 24
core
Xeon E5-2620 on an Intel S2600GZ board with 128 GiB RAM.
Since btrfs has changed to kworkers (I think in 3.15) the frontend
server somewhat randomly crashes with soft lockups (see attachment).
The
system is rock solid with the 3.14.22 kernel.
The lockups happen during the nightly cron-controlled rsync backups
and
occur at random times during this process.
We are totally aware of the fact that this tends to be one of
those “it doesn’t work†bug reports, but
it’s really hard to pin
down the source of the problem other than it seems to be related to
the
kworkers. We’d love to provide any feedback we can, please let
us know
what you need.
Hi,
This may actually be related to a different btrfs change in the 3.15
kernel. Do you see more than one soft lockup? After the softlockup,
does the box recover or is it stuck forever?
-chris
Hi Chris
"Normaly" are there more than one soft lockup and the load goes up to
sky and the server stuck forever until hard reset.
If you want, i send you tomorrow morning the whole kernel log?
regards
Patrick
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