From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Paolo Bonzini <pbonzini@redhat.com>, qemu-block@nongnu.org
Cc: qemu-devel <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] strange crash in tracked_request_begin
Date: Mon, 7 Mar 2016 14:40:05 +0100 [thread overview]
Message-ID: <56DD84B5.8010206@de.ibm.com> (raw)
In-Reply-To: <56DD8399.1000504@redhat.com>
On 03/07/2016 02:35 PM, Paolo Bonzini wrote:
>
>
> On 07/03/2016 13:29, Christian Borntraeger wrote:
>> Folks,
>>
>> I had a crash of a qemu guest in tracked_request_begin.
>> The testcase was a guest with ramdisk/kernel that reboots in a
>> loop. (about 10 times per second) with a single null-co disk
>> attached.
>
> Does it use a separate iothread?
yes
libvirt kludge (why is there no null-co/null-aio in libvirt?) looks like
<qemu:commandline>
<qemu:arg value='-drive'/>
<qemu:arg value='driver=null-co,id=null8,if=none,size=100G'/>
<qemu:arg value='-device'/>
<qemu:arg value='virtio-blk-ccw,scsi=off,drive=null8,serial=null8,iothread=iothread1'/>
</qemu:commandline>
next prev parent reply other threads:[~2016-03-07 13:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-07 12:29 [Qemu-devel] strange crash in tracked_request_begin Christian Borntraeger
2016-03-07 13:35 ` Paolo Bonzini
2016-03-07 13:40 ` Christian Borntraeger [this message]
2016-03-07 17:01 ` Stefan Hajnoczi
2016-03-07 19:00 ` Christian Borntraeger
2016-03-08 10:06 ` Stefan Hajnoczi
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