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xen-devel
RE: [Xen-devel] Re: Xen crash during boot with debug=y
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
-----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...
>
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