From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57470) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XzSYg-0005YG-1T for qemu-devel@nongnu.org; Fri, 12 Dec 2014 10:55:16 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XzSYX-0001y2-4O for qemu-devel@nongnu.org; Fri, 12 Dec 2014 10:55:09 -0500 Received: from mail-wi0-f175.google.com ([209.85.212.175]:52095) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XzSYW-0001xt-UE for qemu-devel@nongnu.org; Fri, 12 Dec 2014 10:55:01 -0500 Received: by mail-wi0-f175.google.com with SMTP id l15so2958969wiw.2 for ; Fri, 12 Dec 2014 07:54:59 -0800 (PST) MIME-Version: 1.0 From: Mohammed Gamal Date: Fri, 12 Dec 2014 16:54:39 +0100 Message-ID: Content-Type: multipart/alternative; boundary=047d7b3a83463f7294050a06ea50 Subject: [Qemu-devel] QMP unix socket randomly returning -EAGAIN List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Anshul Makkar , Mikhail Sennikovskii , Elmar Gerdes , Eduardo Otubo , Luiz Capitulino --047d7b3a83463f7294050a06ea50 Content-Type: text/plain; charset=UTF-8 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 --047d7b3a83463f7294050a06ea50 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi,

We are experiencing random errors w= ith communication with VMs with QMP via unix sockets. At some moment of tim= e the QMP socket keeps on returning -EAGAIN and never recovering from this = state unless the qemu process is stopped then started. This socket hickup h= appens specfically when connecting to the socket or receiving a response fr= om it.

I suspected that this might be caused by th= e guest hanging on some IO or being unresponsive for any reason, =C2=A0but = the VMs in question were not unresponsive at these times and could be acces= sed 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 id= eas what might be causing this?

Regards,
Mohammed
--047d7b3a83463f7294050a06ea50--