From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH] xen: fix hypervisor crash with xentrace
Date: Wed, 06 Apr 2011 15:54:12 +0100
Message-ID: <C9C23D24.15F07%keir.xen@gmail.com>
References: <201104061632.02099.Christoph.Egger@amd.com>
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On 06/04/2011 15:32, "Christoph Egger" <Christoph.Egger@amd.com> wrote:

> 
> Hi,
> 
> Attached patch fixes hypervisor crashes when xentrace buffer gets initialized.

Should be fixed by c/s 23173. Thanks!

 -- Keir

> 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@amd.com>
>