On Tue, 20 May 2014 23:24:36 +0200 christian.schwarz@xxxxxxxxx wrote:
> Hello,
>
> I have an issue with stalling writes that within a few seconds
> ultimately lead to a full system freeze. Since all writes fail once the
> condition has been triggered, there is no log output. Also dmesg remains
> without errors.
>
> My setup is as follows:
>
> md127 : active raid10 sda1[0] sdd1[3] sdc1[2] sdb1[1]
> 3907023872 blocks super 1.2 512K chunks 2 near-copies [4/4]
> [UUUU]
>
> Linux 3.14.2-hardened-r1 #4 SMP PREEMPT
Fixed by upstream commit
commit cc13b1d1500656a20e41960668f3392dda9fa6e2
Author: NeilBrown <neilb@xxxxxxx>
Date: Mon May 5 13:34:37 2014 +1000
md/raid10: call wait_barrier() for each request submitted.
which will be in 3.15, and hopefully will appear in the next 3.14.y release
(it isn't in 3.14.4).
NeilBrown
>
> Dell Poweredge T20 Server
>
>
> To trigger this condition, a resync of the array has to be running and
> high disk IO needs to be performed in addition. The condition is
> triggered regardless of the resync speed (tested with 1, 10 and 100
> MB/s). I also tried different io schedulers and a non-preempt kernel.
>
>
> Someone else over at Fedora reported a similiar problem:
> http://www.spinics.net/linux/fedora/fedora-kernel/msg05163.html
>
>
> How can I help with providing additional information so you can locate
> the problem?
>
>
> Thanks,
>
> Christian
>
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