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

[Christoph Egger <Christoph.Egger@xxxxxxx>]

Hi,

Attached patch fixes hypervisor crashes when xentrace buffer gets initialized.

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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Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
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xen_xentrace.diff
Description: xen_xentrace.diff

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