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Bug 813271

Summary: intermittent appliance boot failures (divide_error)
Product: Red Hat Enterprise Linux 6 Reporter: Pádraig Brady <pbrady>
Component: qemu-kvmAssignee: Virtualization Maintenance <virt-maint>
Status: CLOSED WONTFIX QA Contact: Virtualization Bugs <virt-bugs>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.3CC: acathrow, areis, bsarathy, dyasny, juzhang, leiwang, mkenneth, moli, qguan, qwan, tburke, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 813413 (view as bug list) Environment:
Last Closed: 2012-11-26 23:37:30 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 813413, 814231, 1005011    
Bug Blocks:    
Attachments:
Description Flags
guestmount debug output
none
guestfish messages from failed boot none

Description Pádraig Brady 2012-04-17 11:32:36 UTC 
libguestfs-1.16.18-2.el6.x86_64

Easy to reproduce here.
Just boot a VM with:

http://download.devel.redhat.com/rel-eng/RHEL-6-Alpha-2.0/6.3/Live/RHEL6.3-20120329.0-Workstation-x86_64-Live.iso
      https://bugzilla.redhat.com/show_bug.cgi?id=808935 # to fix anaconda bug
And these repos:
    http://download.devel.redhat.com/rel-eng/RHEL-6-Alpha-2.0/6.3/Workstation/x86_64/os/
    http://people.redhat.com/~rjones/libguestfs-RHEL-6.3-preview/

truncate -s 100MB file.t
mkfs.ext2 -F file.t
while true; do date; LIBGUESTFS_DEBUG=1 guestmount -m /dev/sda -a file.t t >>gmount.out 2>&1 && { cd t; cd ..; umount t; } || echo "mount failed"; done

gmount.out is attached
Comment 1 Pádraig Brady 2012-04-17 11:34:16 UTC 
Created attachment 578003 [details]
guestmount debug output
Comment 3 Richard W.M. Jones 2012-04-17 12:13:54 UTC 
Does this fail?

while guestfish -a /dev/null run -v > /tmp/fish.out 2>&1 ; do echo -n . ; done
Comment 4 Richard W.M. Jones 2012-04-17 14:38:09 UTC 
(In reply to comment #3)
> Does this fail?
> 
> while guestfish -a /dev/null run -v > /tmp/fish.out 2>&1 ; do echo -n . ; done

In answer, Pádraig tried it and yes it does fail after a few
iterations ("fewer than 6" according to Pádraig).

I tried it on 6.2 (but on baremetal) and it ran for hundreds of
iterations, so this could be a kernel regression, but I still
need to check I can reproduce the issue on 6.3 beta 1 + baremetal.
Comment 5 Richard W.M. Jones 2012-04-17 17:06:08 UTC 
Created attachment 578109 [details]
guestfish messages from failed boot

Seems to only happen in a nested VM, and rather easy to trigger.

libguestfs-tools-c-1.16.18-2.el6.x86_64
qemu-kvm-0.12.1.2-2.272.el6.x86_64
kernel 2.6.32-262.el6.x86_64
Comment 6 RHEL Program Management 2012-05-03 05:16:02 UTC 
Since RHEL 6.3 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.
Comment 7 Richard W.M. Jones 2012-09-28 12:33:30 UTC 
Still seeing this one with:
kernel-2.6.32-309.el6.x86_64
qemu-kvm-0.12.1.2-2.316.el6.x86_64
although it took me 200 iterations to hit it.

I'm going to try adding noapic to the command line.
Comment 8 Richard W.M. Jones 2012-09-28 13:13:29 UTC 
Crashes with noapic too, in a different way!
Comment 9 Richard W.M. Jones 2012-10-11 09:15:33 UTC 
As I don't have a way to fix this, or even to reproduce
it reliably, and the evidence points to an obscure timing
issue within qemu, I'm afraid all I can do is defer this
to RHEL 6.5 and reassign it to qemu.
Comment 10 Dor Laor 2012-11-13 16:49:25 UTC 
Is that important enough not to close it?
Comment 11 Ademar Reis 2012-11-26 23:37:30 UTC 
(In reply to comment #10)
> Is that important enough not to close it?

+1

I'm closing it, please reopen if you believe it's actually important and can be reproduced in a non-nested environment.