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Subjectsound: BUG: unable to handle kernel irq event stamp: 2013419
Hi all,

I got the following kernel panic when running the trinity fuzzer in a
KVM tool guest, using today's linux-next.

Please note that the guest doesn't have anything which even remotely
reminds a multimedia device of any sort, although most of the drivers
are compiled into the kernel.

[ 145.747790] BUG: unable to handle kernel irq event stamp: 2013419
[ 145.744076] hardirqs last enabled at (2013419):
[<ffffffff811582d8>] __call_rcu+0x128/0x2c0
[ 145.744076] hardirqs last disabled at (2013418):
[<ffffffff81158247>] __call_rcu+0x97/0x2c0
[ 145.744076] softirqs last enabled at (2013156):
[<ffffffff810b9a93>] __do_softirq+0x133/0x180
[ 145.744076] softirqs last disabled at (2013139):
[<ffffffff8270c96c>] call_softirq+0x1c/0x30
[ 145.748761] paging request at ffffc9000279e000
[ 145.748761] IP: [<ffffffff821474cb>] midi_poll+0x6b/0x180
[ 145.748761] PGD 3c9bc067 PUD 3c9bd067 PMD 36b5c067 PTE 0
[ 145.748761] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 145.748761] CPU 0
[ 145.748761] Pid: 3129, comm: trinity Tainted: G W
3.3.0-rc7-next-20120315-sasha-00002-g91cfd71 #51
[ 145.748761] RIP: 0010:[<ffffffff821474cb>] [<ffffffff821474cb>]
midi_poll+0x6b/0x180
[ 145.784811] RSP: 0018:ffff88003d603dc0 EFLAGS: 00010086
[ 145.784811] RAX: 0000000000000000 RBX: 0000000000000282 RCX: ffffc9000279e000
[ 145.792008] RDX: ffff880034ad0000 RSI: 0000000000000000 RDI: 0000000000000001
[ 145.792008] RBP: ffff88003d603df0 R08: 0000000000000001 R09: 0000000000000000
[ 145.792008] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[ 145.792008] R13: 0000000010624dd3 R14: 0000000000000001 R15: 0000000000000000
[ 145.792008] FS: 00007f2af88d0700(0000) GS:ffff88003d600000(0000)
knlGS:0000000000000000
[ 145.792008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 145.792008] CR2: ffffc9000279e000 CR3: 0000000035195000 CR4: 00000000000406f0
[ 145.792008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 145.792008] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 145.792008] Process trinity (pid: 3129, threadinfo
ffff880034aca000, task ffff880034ad0000)
[ 145.792008] Stack:
[ 145.792008] ffff880034ad0000 ffff880034acbfd8 ffff88003d603e10
0000000000000102
[ 145.792008] ffffffff82147460 0000000000000000 ffff88003d603e70
ffffffff810c0c2a
[ 145.792008] ffffffff810c0ba0 ffff88003d603ea0 ffffffff8300abec
ffffffff83d2e370
[ 145.792008] Call Trace:
[ 145.792008] <IRQ>
[ 145.792008] [<ffffffff82147460>] ? midi_input_intr+0xb0/0xb0
[ 145.792008] [<ffffffff810c0c2a>] call_timer_fn.clone.11+0x8a/0x110
[ 145.792008] [<ffffffff810c0ba0>] ? process_timeout+0x10/0x10
[ 145.792008] [<ffffffff82147460>] ? midi_input_intr+0xb0/0xb0
[ 145.792008] [<ffffffff810c0efa>] run_timer_softirq+0x13a/0x220
[ 145.792008] [<ffffffff810b9a28>] __do_softirq+0xc8/0x180
[ 145.792008] [<ffffffff811fce9d>] ? dput+0x13d/0x1d0
[ 145.792008] [<ffffffff8270c96c>] call_softirq+0x1c/0x30
[ 145.792008] [<ffffffff8104fc05>] do_softirq+0xc5/0x100
[ 145.792008] [<ffffffff810b9e9e>] irq_exit+0xae/0xe0
[ 145.792008] [<ffffffff810719e8>] smp_apic_timer_interrupt+0x68/0xa0
[ 145.792008] [<ffffffff8270bf6f>] apic_timer_interrupt+0x6f/0x80
[ 145.792008] <EOI>
[ 145.792008] [<ffffffff8270a9f4>] ? retint_restore_args+0x13/0x13
[ 145.792008] [<ffffffff81119528>] ? lock_release+0x98/0xc0
[ 145.792008] [<ffffffff82709b6e>] _raw_spin_unlock+0x1e/0x60
[ 145.792008] [<ffffffff811fce9d>] dput+0x13d/0x1d0
[ 145.792008] [<ffffffff811f35e1>] do_last+0x461/0x790
[ 145.792008] [<ffffffff811f39e7>] path_openat+0xd7/0x500
[ 145.792008] [<ffffffff810ec458>] ? sched_clock_cpu+0xc8/0x140
[ 145.792008] [<ffffffff811f3e54>] do_filp_open+0x44/0xa0
[ 145.792008] [<ffffffff82709b80>] ? _raw_spin_unlock+0x30/0x60
[ 145.792008] [<ffffffff81203a36>] ? alloc_fd+0x176/0x240
[ 145.792008] [<ffffffff811e2c8d>] do_sys_open+0xfd/0x1d0
[ 145.792008] [<ffffffff811e2d7c>] sys_open+0x1c/0x20
[ 145.792008] [<ffffffff8270b2bd>] system_call_fastpath+0x1a/0x1f
[ 145.792008] Code: bd d3 4d 62 10 0f 1f 00 4d 63 f4 4a 83 3c f5 e0
32 90 84 00 0f 84 ad 00 00 00 4a 8b 0c f5 a0 5b 90 84 48 85 c9 0f 84
9c 00 00 00 <8b> 01 85 c0 0f 84 e3 00 00 00 8b 51 04 eb 3d 66 0f 1f 44
00 00
[ 145.792008] RIP [<ffffffff821474cb>] midi_poll+0x6b/0x180
[ 145.792008] RSP <ffff88003d603dc0>
[ 145.792008] CR2: ffffc9000279e000
[ 145.792008] ---[ end trace 31f7a567e17c1567 ]---
[ 145.792008] Kernel panic - not syncing: Fatal exception in interrupt
[ 145.792008] Rebooting in 1 seconds..\

Thanks!


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