Bug 12331

Summary:	Server down after 1-2 days, many of processes in state "D".
Product:	Virtualization	Reporter:	Ján ONDREJ (SAL) (ondrejj)
Component:	Xen	Assignee:	virtualization_xen
Status:	CLOSED OBSOLETE
Severity:	normal	CC:	alan
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.27.9-159.fc10.i686	Subsystem:
Regression:	No	Bisected commit-id:

Description Ján ONDREJ (SAL) 2008-12-30 09:14:01 UTC

Latest working kernel version: kernel-xen-2.6.21.7-5.fc8.i686
Earliest failing kernel version: kernel-PAE-2.6.27.7-134.fc10.i686
Distribution: Fedora 10
Hardware Environment: this problematic guest is running on Fedora 8 dom0
Software Environment: kernel-xen-2.6.21.7-5.fc8, xen-3.1.2-5.fc8
Problem Description:
After some time (aprox. 1-2 days) my server has many of processes in state "D".
Mostly they are postfix, dovecot, crond and mysql.
They blocks my server which after some time hangs.
Problem started after upgrade to Fedora 10, on Fedora 8 there was no problems
with same configuration.

Curious, that after reboot all my logged data is gone. This one is a copy
created before reboot of my machine.
Command "sync" also fails after this problem started.

May be something is with xen blk driver. My dom0 is an fully updated Fedora 8.
Guest is an paravirtualized guest on lvm disk storages.
Steps to reproduce:
I can't reproduce this. It only happens every 1-2 days.

Same problems for kernel.x86_64 and kernel-PAE.i386.

This bug has been also reported at redhat bugzilla:
  https://bugzilla.redhat.com/show_bug.cgi?id=478414

Comment 1 Ján ONDREJ (SAL) 2008-12-30 09:15:47 UTC

Forgot to say, that logs are here:
  http://www.salstar.sk/fedora-error/

Before debugging there was nothing special in dmesg or messages.

Comment 2 Ján ONDREJ (SAL) 2009-01-05 04:14:47 UTC

After downgrade to fc8 kernel my system is up more than 3 days.
I think there is something wrong with fc10 kernels.