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[Xen-devel] Guest serial console hangs

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Guest serial console hangs
From: Andre Przywara <andre.przywara@xxxxxxx>
Date: Thu, 9 Sep 2010 14:07:49 +0200
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for some weeks now I experience strange hangs in the HVM guest's serial console. I use serial="pty" or serial="file:foo" to redirect an HVM Linux guest's output (with console=ttyS0,115200n8 on the guest kernel cmdline). This usually works, but about half of the time the output (and it seems the guest, too) stops somewhere. I can continue guest operation by pressing a key in the guest's console (of course not in the file: case). Beside that it looks like it is one key behind, so to see the result of an ls for instance I have to press Enter twice.
Has anyone an idea what could cause it or how to debug this?


P.S. I am using a (fairly) recent -unstable HV (about two weeks old), latest unstable xl tool set and a Dom0 kernel.

Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12

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