Re: [Xen-users] QEMU backend initialization failure.

[Paulina Szubarczyk <paulinaszubarczyk@xxxxxxxxx>]

Thank you, that actually works.

Paulina

On 07/19/2016 12:24 AM, Mark Pryor wrote:
> https://lists.xen.org/archives/html/xen-devel/2016-07/msg01745.html
> they posted a patch to qemu-xen in xen-devel. I've not tried it.
> PryMar56
>
>
>
> On Monday, July 18, 2016 1:08 PM, Paulina Szubarczyk
> <paulinaszubarczyk@xxxxxxxxx> wrote:
>
>
> Hi,
>
> I encountered today a problem with starting the qemu device model during
> creation of a PVHVM domain.
>
> qemu-log:
> xen be core: xen be core: xen be: watching backend path
> (backend/console/21) failed
> xen be: watching backend path (backend/console/21) failed
> xen be core: xen be core: xen be: watching backend path
> (backend/vkbd/21) failed
> xen be: watching backend path (backend/vkbd/21) failed
> xen be core: xen be core: xen be: watching backend path
> (backend/qdisk/21) failed
> xen be: watching backend path (backend/qdisk/21) failed
>
> my current system configuration:
> release                : 4.6.2-040602-generic
> xen_version            : 4.8-unstable
> qemu              : 2.6.50
>
> I looked for the cause of it and on my machine the problem comes from
> creating a new posix thread. More specifically the setting of the stack
> size for a thread causes a failure of creation of the thread with the
> value EINVAL - Invalid argument.
>
> In the tools/xenstore/xs.c:xs_watch the function
> pthread_attr_setstacksize(&attr, DEFAULT_THREAD_STACKSIZE) is called.
> The DEFAULT_THREAD_STACKSIZE cannot be less then PTHREAD_STACK_MIN that
> resolves to 16 KB and this is also the default value set by the
> toolstack. But setting the stack to that value causes the EINVAL. A
> default value for the stack is 8MB. I played with the parameter
> DEFAULT_THREAD_STACKSIZE and the problem does not exist for the value
> above or equal 20KB in my case.
>
> I saw that there was a similar raport on the list recently.
> https://lists.xenproject.org/archives/html/xen-users/2016-07/msg00021.html
>
> Paulina
>
>
>
>
>
>
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