Re: [Xen-devel] ACPI suspend/resume not failing with (dom0) kernel panic

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 12/23/2016 12:16 PM, Dario Faggioli wrote:
> Hey,
>
> I was trying ACPI suspend/resume for testing some patches to Xen, on a
> box on which I'm 100% sure I've seen it working a few time back.
>
> Right now, suspending seems ok, but upon resuming, this is what I see
> (and after that, everything is just locked):
>
> [  132.790494] smpboot: CPU 15 is now offline
> [  132.797383] ACPI: Low-level resume complete
> [  132.801635] PM: Restoring platform NVS memory
> [  142.805036] Kernel panic - not syncing: DMAR hardware is malfunctioning
> [  142.805036] 
> [  142.813109] CPU: 0 PID: 1386 Comm: pm-suspend Not tainted 4.8.0-2-amd64 #1 
> Debian 4.8.11-1
> [  142.821345] Hardware name: Dell Inc. Precision WorkStation T5500  /0CRH6C, 
> BIOS A09 04/20/2011
> [  142.829928]  0000000000000086 00000000ca1fa4d3 ffffffff8cb269f5 
> ffff89b99d076200
> [  142.837340]  ffff89b99b763d48 ffffffff8c97a6b2 0000000000000008 
> ffff89b99b763d58
> [  142.844751]  ffff89b99b763cf0 00000000ca1fa4d3 0000000000000046 
> 0000000000000002
> [  142.852159] Call Trace:
> [  142.854602]  [<ffffffff8cb269f5>] ? dump_stack+0x5c/0x77
> [  142.859980]  [<ffffffff8c97a6b2>] ? panic+0xe4/0x226
> [  142.865004]  [<ffffffff8cc4b7c8>] ? dmar_disable_qi+0x108/0x110
> [  142.870978]  [<ffffffff8cc4bb1e>] ? dmar_reenable_qi+0x1e/0x30
> [  142.876863]  [<ffffffff8cc5429f>] ? reenable_irq_remapping+0x2f/0x110
> [  142.883358]  [<ffffffff8c850ccd>] ? lapic_resume+0x1ed/0x290
> [  142.889073]  [<ffffffff8cc5fd14>] ? syscore_resume+0x44/0x180
> [  142.894873]  [<ffffffff8c8c86f4>] ? suspend_devices_and_enter+0x654/0x6f0
> [  142.901711]  [<ffffffff8c8c8ab1>] ? pm_suspend+0x321/0x3a0
> [  142.907253]  [<ffffffff8c8c731f>] ? state_store+0x6f/0xd0
> [  142.912707]  [<ffffffff8ca7fa98>] ? kernfs_fop_write+0x118/0x1a0
> [  142.918766]  [<ffffffff8ca02303>] ? vfs_write+0xb3/0x1a0
> [  142.924131]  [<ffffffff8ca036e2>] ? SyS_write+0x52/0xc0
> [  142.929413]  [<ffffffff8cdefa76>] ? system_call_fast_compare_end+0xc/0x96
> [  142.936264] Kernel Offset: 0xb800000 from 0xffffffff81000000 (relocation 
> range: 0xffffffff80000000-0xffffffffbfffffff)
> [  142.947007] ---[ end Kernel panic - not syncing: DMAR hardware is 
> malfunctioning
>
> Does this ring any bell?

Not really.

Does this happen without your patches too? What about other Xen versions
and/or baremetal?

Try also booting Xen with "iommu=debug" and see if something shows up in
the log.

-boris

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