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xen-devel
RE: [Xen-devel] Re: Xen crash during boot with debug=y
Kay, Allen M wrote:
> There is a known debug=y problem caused by cs# 19602. We will be
> submitting a patch shortly for it.
>
> Are you using a NHM system?
Allen,
George has solved the his issue. It's not related to cs # 19602. Pls search his
mail in mailing list.
cs# 19602 with debug=y causes the spinlock panic only when you enable VT-d with
interrupt remapping, because it calls xmalloc with interrupt disabled. I will
fix it soon.
Regards,
Weidong
>
> Allen
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of George
> Dunlap Sent: Tuesday, June 02, 2009 10:20 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Re: Xen crash during boot with debug=y
>
> Hm, I added some code to the check_lock() to print whenever it was
> initializing, and found that the lock in pci.c was initialized to
> zero.
>
> So I added some code to double-check the lock, modifying the layout of
> pci.c slightly, and the problem went away.
>
> Which likely means that there's a buffer overflow somewhere clobbering
> the spinlock debug value. Fun, fun, fun...
>
> -George
>
> On Tue, Jun 2, 2009 at 4:09 PM, George Dunlap
> <George.Dunlap@xxxxxxxxxxxxx> wrote:
>> I'm getting the following panic in Xen with tip when building with
>> debug=y. It seems to be something with the spinlock/irq
>> sanity-checking code; but it doesn't make any sense, because the lock
>> in question is defined statically in xen/arch/x86/pci.c, and only
>> used
>> two places in that file, with irqsave/irqrestore both times. Any
>> ideas?
>>
>> -George
>>
>> (XEN) Freed 140kB init memory.
>> (XEN) Xen BUG at spinlock.c:24
>> (XEN) ----[ Xen-3.5-unstable x86_64 debug=y Tainted: C ]----
>> (XEN) CPU: 0 (XEN) RIP: e008:[<ffff828c8011b7b7>]
>> check_lock+0x3d/0x49 (XEN) RFLAGS: 0000000000010046 CONTEXT:
>> hypervisor (XEN) rax: 0000000000000000 rbx: ffff828c8020fa68
>> rcx: 0000000000000001 (XEN) rdx: 0000000000000000 rsi:
>> 0000000000000001 rdi: ffff828c8020fa6c (XEN) rbp: ffff828c8028fd38
>> rsp: ffff828c8028fd38 r8: 0000000000000000 (XEN) r9:
>> ffff828c8028fee4 r10: 0000000000cfbb00 r11: 000000000000ffff
>> (XEN) r12: 0000000000000286 r13: 0000000000000004 r14:
>> 0000000000000000 (XEN) r15: 0000000000000000 cr0: 000000008005003b
>> cr4: 00000000000026f0 (XEN) cr3: 000000012ffae000 cr2:
>> 00000000c1013fe8 (XEN) ds: e021 es: e021 fs: 0000 gs: 0000
>> ss: 0000 cs: e008 (XEN) Xen stack trace from rsp=ffff828c8028fd38:
>> (XEN) ffff828c8028fd58 ffff828c8011ba2f 0000000000000004
>> 0000000080000008 (XEN) 0000000000000000 ffff828c80161187
>> 0000000000000004 ffff828c8028fdb8 (XEN) 0000000000000cfc
>> ffff828c80167ba2 ffff8300cf2fa000 0000000000000000 (XEN)
>> 0000000000000cfc ffff828c8028fe88 ffff828c8028ff28 0000000000000000
>> (XEN) ffff828c8028ff18 ffff828c8016b11c ffff83010000f800
>> ffff8300cf2fa000 (XEN) ffff828c8028fe78 ffff828c8015e527
>> ffff828c8028fe28 0000000000000282 (XEN) 0000000000000282
>> 0000000000000286 000000008028fe58 ffff83012ffc6308 (XEN)
>> ffff83012feb9a80 0000000000000006 00000000ff750000 ffff8300cf2fa000
>> (XEN) ffff828c8028fe78 ffff828c80162f66 000000000000e021
>> ffff828402000020 (XEN) ffff83012feb9a80 0000000000000006
>> 00000004025fd720 0000000400000004 (XEN) 00000000c0603d87
>> ffff828c8015ebf6 828c801db970b948 c390ed90d1ffffff (XEN)
>> 00000000ff750000 000000008011d687 000000012feb9067 ffff83012ffcc0e0
>> (XEN) ffff828c8028ffed 00000000ffffffff 0000000000000000
>> ffff8300cf2fa000 (XEN) 0000000000000000 00c0bb0000000000
>> 0000000000000000 ffff8300cf2fa000 (XEN) 0000000000000000
>> 0000000000000000 0000000000000000 0000000000000000 (XEN)
>> 00007d737fd700b7 ffff828c801db6db 0000000000000000 0000000000000000
>> (XEN) 0000000000000000 0000000000000000 00000000c05f3f34
>> 0000000000000cfc (XEN) 0000000000000000 0000000000000000
>> 0000000000000000 0000000000000000 (XEN) 0000000000000000
>> 0000000000000000 0000000000000cfc 0000000000000000 (XEN)
>> 0000000000000000 0000000d00000000 00000000c0603d86 000000000000e019
>> (XEN) Xen call trace: (XEN) [<ffff828c8011b7b7>]
>> check_lock+0x3d/0x49 (XEN) [<ffff828c8011ba2f>]
>> _spin_lock_irqsave+0x21/0x53 (XEN) [<ffff828c80161187>]
>> pci_conf_read+0x37/0xd0 (XEN) (XEN) (XEN)
>> **************************************** (XEN) Panic on CPU 0: (XEN)
>> Xen BUG at spinlock.c:24 (XEN)
>> **************************************** (XEN) (XEN) Reboot in five
>> seconds...
>>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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