Re: Bug in timer interrupt crashed dom0

[Jon Mason <jdmason@us.ibm.com>]

I was seeing nearly the same error on my dual opteron system running
Last Tuesday's build (09/06).  My only change to Xen was a slight
change (addition of some printks) to swiotlb.c.

Monday's build (09/12), which includes Xin's patch, does not reproduce
the problem.  Great job.

Thanks,
Jon

On Sat, Sep 10, 2005 at 01:10:59PM +0800, Li, Xin B wrote:
> Hi Keir, I encountered a timer interrupt issue while running VMX guest,
> this causes xen0 crash as following:
> 
> Timer ISR/6: Time went backwards: delta=-2277754 cpu_delta=42704729
> shadow=597009701164 off=793003739 processed=597804982483
> cpu_processed=597760000000
>  0: 597794982483
>  1: 596930000000
>  2: 597790000000
>  3: 597800000000
>  4: 597800000000
>  5: 596920000000
>  6: 597760000000
>  7: 597800000000
> Unable to handle kernel paging request at virtual address 327d2332
>  printing eip:
> c010c2e2
> *pde = ma 00000000 pa 55555000
> Oops: 0002 [#1]
> PREEMPT SMP 
> Modules linked in: video thermal processor fan button battery ac
> CPU:    6
> EIP:    0061:[<c010c2e2>]    Not tainted VLI
> EFLAGS: 00010203   (2.6.12-xen0) 
> EIP is at timer_interrupt+0x162/0x2c0
> eax: 327d2332   ebx: 00000008   ecx: 00000000   edx: 00010000
> esi: c05cb3c0   edi: 01f308d9   ebp: 00000000   esp: c00cde6c
> ds: 007b   es: 007b   ss: 0069
> Process swapper (pid: 0, threadinfo=c00cc000 task=c00b7a40)
> Stack: c05d9ae0 00000008 2fa81a00 0000008b 028b9f59 00000000 008d192c
> 0000008b 
>        2f4446db 00000000 2ff420d3 0000008b 2d45c000 0000008b 2f4446db
> 00000000 
>        c1436320 c05cb3c0 000000a8 c05cb3c0 ffdd3e86 ffffffff c00fad00
> 00000117 
> Call Trace:
>  [<c0142684>] handle_IRQ_event+0x84/0xe0
>  [<c01427bc>] __do_IRQ+0xdc/0x140
>  [<c010e3dd>] do_IRQ+0x1d/0x30
>  [<c01049e0>] evtchn_do_upcall+0x90/0x100
>  [<c0109740>] hypervisor_callback+0x2c/0x34
>  [<c0107001>] xen_idle+0x51/0xc0
>  [<c01070c7>] cpu_idle+0x57/0x70
>  [<c045ee9d>] preempt_schedule+0x4d/0x70
> Code: c0 e8 13 42 35 00 85 ed 7c 69 7e 7b be c0 b3 5c c0 90 8d b4 26 00
> 00 00 00 8b 04 9d 20 f0 5c c0 81 c7 80 69 67 ff 83 d5 ff 01 f0 <81> 00
> 80 96 98 00 83 50 04 00 31 c0 8b 54 24 74 f6 42 32 02 75 
>  <0>Kernel panic - not syncing: Fatal exception in interrupt
>  stop_this_cpu disable_local_APIC
> stop_this_cpu disable_local_APIC
> stop_this_cpu disable_local_APIC
> stop_this_cpu disable_local_APIC
> Timer ISR/1: Time went backwards: delta=-1313332 cpu_delta=873669151
> shadow=597009338050 off=794331480 processed=597804982483
> cpu_processed=596930000000
>  0: 597794982483
>  1: 596930000000
>  2: 597790000000
>  3: 597800000000
> Timer ISR/5: Time went backwards: delta=-1329261 cpu_delta=883653222
> shadow=597009051468 off=794601976 processed=597804982483
> cpu_processed=596920000000
>  0: 597794982483
>  1: 596930000000
>  2: 597790000000
>  3: 597800000000
> Timer ISR/2: Time went backwards: delta=-1314723 cpu_delta=13667760
> shadow=597008910970 off=794756988 processed=597804982483
> cpu_processed=597790000000
>  0: 597794982483
>  1: 596930000000
>  2: 597790000000
>  3: 597800000000
> stop_this_cpu disable_local_APIC
> stop_this_cpu disable_local_APIC
> stop_this_cpu disable_local_APIC
> smp_send_stop disable_local_APIC
> (XEN) Domain 0 shutdown: rebooting machine.
> 
> -Xin
> 
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