From: Paolo Bonzini <pbonzini@redhat.com>
To: Jim Minter <jminter@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
Hannes Reinecke <hare@suse.de>
Subject: Re: [Qemu-devel] sda abort with virtio-scsi
Date: Thu, 4 Feb 2016 11:23:48 +0100 [thread overview]
Message-ID: <56B326B4.1020407@redhat.com> (raw)
In-Reply-To: <56B28E8B.1030107@redhat.com>
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)
next prev parent reply other threads:[~2016-02-04 10:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 21:46 [Qemu-devel] sda abort with virtio-scsi Jim Minter
2016-02-03 23:19 ` Paolo Bonzini
2016-02-03 23:34 ` Jim Minter
2016-02-04 10:23 ` Paolo Bonzini [this message]
2016-02-04 11:00 ` Denis V. Lunev
2016-02-04 13:41 ` Jim Minter
2016-02-04 13:54 ` Hannes Reinecke
2016-02-04 15:03 ` Paolo Bonzini
2016-02-04 15:11 ` Hannes Reinecke
2016-02-08 20:02 ` Jim Minter
2016-02-04 6:59 ` Hannes Reinecke
2016-02-04 11:27 ` Paolo Bonzini
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