* [Qemu-devel] QMP unix socket randomly returning -EAGAIN
@ 2014-12-12 15:54 Mohammed Gamal
2014-12-15 14:00 ` Luiz Capitulino
0 siblings, 1 reply; 2+ messages in thread
From: Mohammed Gamal @ 2014-12-12 15:54 UTC (permalink / raw)
To: qemu-devel
Cc: Anshul Makkar, Mikhail Sennikovskii, Elmar Gerdes, Eduardo Otubo,
Luiz Capitulino
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Hi,
We are experiencing random errors with communication with VMs with QMP via
unix sockets. At some moment of time the QMP socket keeps on returning
-EAGAIN and never recovering from this state unless the qemu process is
stopped then started. This socket hickup happens specfically when
connecting to the socket or receiving a response from it.
I suspected that this might be caused by the guest hanging on some IO or
being unresponsive for any reason, but the VMs in question were not
unresponsive at these times and could be accessed via VNC or SSH normally.
I've seen this on machines runnnig qemu 1.0,1 1.2.0 and 2.0.0
I am suspecting it might be a bug in the monitor code, but I couldn't reach
anything tangible. Any ideas what might be causing this?
Regards,
Mohammed
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] QMP unix socket randomly returning -EAGAIN
2014-12-12 15:54 [Qemu-devel] QMP unix socket randomly returning -EAGAIN Mohammed Gamal
@ 2014-12-15 14:00 ` Luiz Capitulino
0 siblings, 0 replies; 2+ messages in thread
From: Luiz Capitulino @ 2014-12-15 14:00 UTC (permalink / raw)
To: Mohammed Gamal
Cc: Anshul Makkar, Mikhail Sennikovskii, qemu-devel, Eduardo Otubo,
Elmar Gerdes
On Fri, 12 Dec 2014 16:54:39 +0100
Mohammed Gamal <mohammed.gamal@profitbricks.com> wrote:
> Hi,
>
> We are experiencing random errors with communication with VMs with QMP via
> unix sockets. At some moment of time the QMP socket keeps on returning
> -EAGAIN and never recovering from this state unless the qemu process is
> stopped then started. This socket hickup happens specfically when
> connecting to the socket or receiving a response from it.
>
> I suspected that this might be caused by the guest hanging on some IO or
> being unresponsive for any reason, but the VMs in question were not
> unresponsive at these times and could be accessed via VNC or SSH normally.
> I've seen this on machines runnnig qemu 1.0,1 1.2.0 and 2.0.0
>
> I am suspecting it might be a bug in the monitor code, but I couldn't reach
> anything tangible. Any ideas what might be causing this?
No. Can you provide a reproducer?
^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-12-15 14:00 ` Luiz Capitulino
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