Re: [Xen-devel] Dom 0 crash

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.11.13 at 12:58, Ian Murray <murrayie@xxxxxxxxxxx> wrote:
> I have a recurring crash using Xen 4.3.1-RC2 and Ubuntu 12.04 as Dom0 
> (3.2.0-55-generic). I have software RAID 5 with LVM's. DomU (also 12.04 
> Ubuntu 3.2.0-55 kernel) has a dedicated logical volume, which is being backed 
> up shutting down the DomU, an LVM snapshot being created, restart of DomU and 
> then the snapshot dd'ed to another logical volume. The snapshot is then 
> removed and the second LV is dd'ed to gzip and onto DAT tape.
> 
> I currently have this running every hour (unless its already running) for 
> testing purposes. After 6-12 runs of this, the Dom0 kernel crashes with he 
> below output.
> 
> When I preform this booting into the same kernel standalone, the problem 
> does not occur.

Likely because the action that triggers this doesn't get performed
in that case?

> Can anyone please suggest what I am doing wrong or identify if it is bug?

Considering that exception address ...

> RIP: e030:[<ffffffff8142655d>]  [<ffffffff8142655d>] 
> scsi_dispatch_cmd+0x6d/0x2e0

... and call stack ...

> [24149.786311] Call Trace:
> [24149.786315]  <IRQ> 
> [24149.786323]  [<ffffffff8142da62>] scsi_request_fn+0x3a2/0x470
> [24149.786333]  [<ffffffff812f1a28>] blk_run_queue+0x38/0x60
> [24149.786339]  [<ffffffff8142c416>] scsi_run_queue+0xd6/0x1b0
> [24149.786347]  [<ffffffff8142e822>] scsi_next_command+0x42/0x60
> [24149.786354]  [<ffffffff8142ea52>] scsi_io_completion+0x1b2/0x630 
> [24149.786363]  [<ffffffff816611fe>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
> [24149.786371]  [<ffffffff81424b5c>] scsi_finish_command+0xcc/0x130 
> [24149.786378]  [<ffffffff8142e7ae>] scsi_softirq_done+0x13e/0x150 
> [24149.786386]  [<ffffffff812fb6b3>] blk_done_softirq+0x83/0xa0
> [24149.786394]  [<ffffffff8106fa38>] __do_softirq+0xa8/0x210
> [24149.786402]  [<ffffffff8166ba6c>] call_softirq+0x1c/0x30
> [24149.786410]  [<ffffffff810162f5>] do_softirq+0x65/0xa0
> [24149.786416]  [<ffffffff8106fe1e>] irq_exit+0x8e/0xb0
> [24149.786428]  [<ffffffff813aecd5>] xen_evtchn_do_upcall+0x35/0x50 
> [24149.786436]  [<ffffffff8166babe>] xen_do_hypervisor_callback+0x1e/0x30 
> [24149.786441]  <EOI> 
> [24149.786449]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
> [24149.786456]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
> [24149.786464]  [<ffffffff8100a500>] ? xen_safe_halt+0x10/0x20
> [24149.786472]  [<ffffffff8101c913>] ? default_idle+0x53/0x1d0
> [24149.786478]  [<ffffffff81013236>] ? cpu_idle+0xd6/0x120

... point into the SCSI subsystem, this is likely the wrong list to
ask for help on.

Jan


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