Re: [Qemu-devel] sda abort with virtio-scsi

[Jim Minter <jminter@redhat.com>]

FWIW, I've now done:

echo 300 >/sys/block/sda/device/timeout

Not entirely sure whether it would help or not, but so far I haven't had 
a recurrence.

Cheers,

Jim

-- 
Jim Minter
Principal Solution Architect, Red Hat UK
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On 04/02/16 10:23, Paolo Bonzini wrote:
>
>
> On 04/02/2016 00:34, Jim Minter wrote:
>> I was worried there was
>> some way in which the contention could cause an abort and perhaps thence
>> the lockup (which does not seem to recover when the host load goes down).
>
> I don't know... It's not the most tested code, but it is not very
> complicated either.
>
> The certain points that can be extracted from the kernel messages are:
> 1) there was a cancellation request that took a long time, >20 seconds;
> 2) despite taking a long time, it _did_ recover sooner or later because
> otherwise you'd not have the lockup splat either.
>
> Paolo
>
>>> Firing the NMI watchdog is fixed in more recent QEMU, which has
>>> asynchronous cancellation, assuming you're running RHEL's QEMU 1.5.3
>>> (try /usr/libexec/qemu-kvm --version, or rpm -qf /usr/libexec/qemu-kvm).
>>
>> /usr/libexec/qemu-kvm --version reports QEMU emulator version 1.5.3
>> (qemu-kvm-1.5.3-105.el7_2.3)