I've got a Thunder K8SRE with two dual core Opteron processors and
eight 1 GB SDRAM sticks in it.
Booting in to SMP mode resulted in this:
May 16 00:43:37 weebl kernel: Timer ISR/3: Time went backwards:
delta=-12967620 delta_cpu=217015619 shadow=46263756493 off=423276508
processed=46700000000 cpu_processed=46470016761
May 16 00:43:37 weebl kernel: 0: 46680000000
May 16 00:43:37 weebl kernel: 1: 46700016761
May 16 00:43:37 weebl kernel: 2: 45670016761
May 16 00:43:37 weebl kernel: 3: 46470016761
The only time I've seen this is on a system that was overheating and
bouncing in and out of thermal throttling. Any chance that could be
happening here?
May 16 06:28:35 weebl kernel: Call Trace:
<ffffffff8011a275>{mm_unpin+427}
<ffffffff8011a4a4>{_arch_exit_mmap+476}
May 16 06:28:35 weebl kernel:
<ffffffff8014fedd>{generic_file_aio_read+52}
<ffffffff801724a6>{do_sync_read+199}
May 16 06:28:35 weebl kernel: <ffffffff801612d2>{exit_mmap+34}
<ffffffff80128e05>{mmput+40}
May 16 06:28:35 weebl kernel:
That's a nasty crash. There were some cleanups in this area in Xen 3.1,
but I don't think it was to address a specific crash like this. Might be
worth trying 3.1 on the machine.
Best,
Ian
8 messages in com.xensource.lists.xen-develRE: [Xen-devel] Timer going backwards...