Comment 0 for bug 1061070

Reproduced on:

Linux version 3.2.0-30-highbank (buildd@chort) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #48-Ubuntu SMP PREEMPT Fri Aug 24 20:04:03 UTC 2012 (Ubuntu 3.2.0-30.48-highbank 3.2.27)
Linux version 3.2.0-32-highbank (buildd@musimon) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #51-Ubuntu SMP PREEMPT Thu Sep 27 00:36:21 UTC 2012 (Ubuntu 3.2.0-32.51-highbank 3.2.30)

Evidently does not affect:

Linux version 3.5.0-16-highbank (buildd@shedir) (gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) ) #25-Ubuntu SMP PREEMPT Sat Sep 29 01:44:21 UTC 2012 (Ubuntu 3.5.0-16.25-highbank 3.5.4)

When I use busybox's reboot command, I usually get:

Freeing init memory: 176K
pre-reboot
sd 2:0:0:0: [sda] Synchronizing SCSI cache
Restarting system.

U-Boot 2012.07 (Sep 21 2012 - 14:54:04)

Instead, sometimes I get:

Freeing init memory: 176K
pre-reboot
sd 2:0:0:0: [sda] Synchronizing SCSI cache
Restarting system.
Reboot failed -- System halted

To reproduce, I created an initrd that just has busybox and a simple /init sh script that just reboots. I set a node to persistently boot "pxe", and constantly served the same kernel and initrd, for a constantly cycling test. On affected kernels, this reproduces within around five reboots.

Impact: when this strikes, MAAS fails to deploy nodes. MAAS needs three reboots to fully deploy nodes, so the MAAS failure probability is higher than a single reboot failure. This will cause great difficulty when using nodes at scale.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-highbank 3.2.0.32.35
ProcVersionSignature: User Name 3.2.0-31.50-highbank 3.2.28
Uname: Linux 3.2.0-31-highbank armv7l
AcpiTables:

AlsaDevices:
 total 0
 crw-rw---T 1 root audio 116, 1 Oct 3 12:20 seq
 crw-rw---T 1 root audio 116, 33 Oct 3 12:20 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.0.1-0ubuntu13
Architecture: armhf
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
CurrentDmesg: eth0: no IPv6 routers present
Date: Wed Oct 3 12:23:30 2012
HibernationDevice: RESUME=UUID=c9ff4c94-9a06-45db-9517-811db708d878
IwConfig: Error: [Errno 2] No such file or directory
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
PciMultimedia:

ProcFB:

ProcKernelCmdLine: console=ttyAMA0 root=UUID=cd7e02ed-5dad-4dff-ba5d-a5afe52991c1 nosplash
ProcModules:

RelatedPackageVersions:
 linux-restricted-modules-3.2.0-31-highbank N/A
 linux-backports-modules-3.2.0-31-highbank N/A
 linux-firmware 1.79.1
RfKill: Error: [Errno 2] No such file or directory
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)