[Xen-devel] crash in trace.c with large extra_data

[Olaf Hering <olaf@xxxxxxxxx>]

I just ran into the crash below, and I wonder why the ASSERT in
__trace_var() is there anyway? Shouldnt the value of extra_word just
be truncated to TRACE_EXTRA_MAX without crashing the hypervisor??

Olaf


(XEN) Assertion 'extra_word <= TRACE_EXTRA_MAX' failed at trace.c:687
(XEN) Debugging connection not set up.
(XEN) ----[ Xen-4.2.23658-20110711.092126  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    1
(XEN) RIP:    e008:[<ffff82c480128783>] __trace_var+0x4d/0x3b8
(XEN) RFLAGS: 0000000000010006   CONTEXT: hypervisor
(XEN) rax: 0000000000000000   rbx: ffff83083ffbfcc8   rcx: ffff83083ffbfc58
(XEN) rdx: 0000000000000028   rsi: 0000000000000001   rdi: 0000000000802006
(XEN) rbp: ffff83083ffbfc48   rsp: ffff83083ffbfbe8   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: ffffffff801b5760
(XEN) r12: 000000000000000a   r13: 0000000000802006   r14: 0000000000000001
(XEN) r15: ffff83083ffbfc58   cr0: 000000008005003b   cr4: 00000000000026f0
(XEN) cr3: 000000084ea89000   cr2: ffff882f64213db0
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e008
(XEN) Xen stack trace from rsp=ffff83083ffbfbe8:
(XEN)    ffff82c480127959 0000000000000086 0000000000000000 ffff83083ffbfd10
(XEN)    01ff82c4802d7f80 0000000000028004 ffff832da72db000 ffff83083ffbfcc8
(XEN)    0000000000000022 0000000000000002 0000000000000068 ffff830839c02090
(XEN)    ffff83083ffbfc88 ffff82c480162172 0000002200000068 0000000020000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 ffff82c4803063e8
(XEN)    ffff83083ffbfd18 ffff82c4801631ae ffff82c480128a9b ffff82c480306360
(XEN)    ffff82c480306360 ffff83083ffbfcc8 0000001d00000098 ffff83083ffbfdf8
(XEN)    0000000020000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000002 0000000000000068 0000000000000002 ffff83083ffbfdf8
(XEN)    ffff830839806880 0000000000000000 ffff83083ffbfd88 ffff82c48015d813
(XEN)    ffff832da72db000 ffff830839c02090 ffff832daaea3000 0000000000000246
(XEN)    ffff83083ffe06e0 ffff83083ffbfd60 ffff82c480122a11 ffff830839806880
(XEN)    ffff830843621390 ffff8308398068e0 ffff83083ffbff18 0000000000000000
(XEN)    ffff83083ffbfde8 ffff82c480160708 ffff830839c02090 000000000000000c
(XEN)    000000000020f101 0000000000000018 ffff83083ffbfe68 ffff830839806880
(XEN)    0000000000000068 ffff8308398068e0 ffff83083ffbff18 0000000000000000
(XEN)    ffff83083ffbfe38 ffff82c480162938 0000000020000000 0000000000000000
(XEN)    0000000000000000 0000000000000000 ffff83083ffbff18 ffff830839806880
(XEN)    0000000000000068 0000000000000068 ffff83083ffbfe58 ffff82c4801629a7
(XEN)    0000000000000068 0000000000006800 ffff83083ffbfe88 ffff82c48015d969
(XEN) Xen call trace:
(XEN)    [<ffff82c480128783>] __trace_var+0x4d/0x3b8
(XEN)    [<ffff82c480162172>] trace_irq_mask+0x49/0x4b
(XEN)    [<ffff82c4801631ae>] __assign_irq_vector+0x241/0x374
(XEN)    [<ffff82c48015d813>] set_desc_affinity+0x5d/0xd4
(XEN)    [<ffff82c480160708>] set_msi_affinity+0x44/0x1c1
(XEN)    [<ffff82c480162938>] move_masked_irq+0x9c/0xcd
(XEN)    [<ffff82c4801629a7>] move_native_irq+0x3e/0x53
(XEN)    [<ffff82c48015d969>] ack_msi_irq+0x2c/0x6e
(XEN)    [<ffff82c4801622e3>] do_IRQ+0x16f/0x66d
(XEN)
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 1:
(XEN) Assertion 'extra_word <= TRACE_EXTRA_MAX' failed at trace.c:687
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...
(XEN) Debugging connection not set up.


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