Re: [Xen-devel] [PATCH] xen: fix hypervisor crash with xentrace

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 04/06/11 16:32, Christoph Egger wrote:
> Hi,
>
> Attached patch fixes hypervisor crashes when xentrace buffer gets initialized.
Forgot to mention this regression was introduced in c/s 
23134:f5d33782a57b by Jan Beulich.
> The xen backtraces I have seen are:
>
> (XEN) Xen call trace:
> (XEN)    [<ffff82c48025cf70>] early_stack+0x0/0x48
> (XEN)    [<ffff82c4801278d0>] tb_control+0x182/0x278
> (XEN)    [<ffff82c480124aac>] do_sysctl+0x1fc/0xa40
> (XEN)    [<ffff82c480213248>] syscall_enter+0xc8/0x122
> (XEN)
> (XEN) Pagetable walk from ffff82c48025cf70:
> (XEN)  L4[0x105] = 00000000cfcaa027 5555555555555555
> (XEN)  L3[0x112] = 00000000cfcab027 5555555555555555
> (XEN)  L2[0x001] = 000000022f27b063 5555555555555555
> (XEN)  L1[0x05c] = 00000000cfc5c262 5555555555555555
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) FATAL PAGE FAULT
> (XEN) [error_code=0010]
> (XEN) Faulting linear address: ffff82c48025cf70
> (XEN) ****************************************
>
>
> (XEN) Xen call trace:
> (XEN)    [<ffff82c48025d852>] notifier_chain_register+0x0/0x35
> (XEN)    [<ffff82c4801275b2>] alloc_trace_bufs+0x5cd/0x7a9
> (XEN)    [<ffff82c480127910>] tb_control+0x182/0x278
> (XEN)    [<ffff82c480124aec>] do_sysctl+0x1fc/0xa40
> (XEN)    [<ffff82c480213288>] syscall_enter+0xc8/0x122
> (XEN)
> (XEN) Pagetable walk from ffff82c48025d852:
> (XEN)  L4[0x105] = 00000000cfcaa027 5555555555555555
> (XEN)  L3[0x112] = 00000000cfcab027 5555555555555555
> (XEN)  L2[0x001] = 000000022f27b063 5555555555555555
> (XEN)  L1[0x05d] = 00000000cfc5d262 5555555555555555
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 1:
> (XEN) FATAL PAGE FAULT
> (XEN) [error_code=0010]
> (XEN) Faulting linear address: ffff82c48025d852
> (XEN) ****************************************
>
>
> Signed-off-by: Christoph Egger<Christoph.Egger@xxxxxxx>

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