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TITLE: BUG: soft lockup in snd_rawmidi_write
TYPE: HANG
[ 352.504666] watchdog: BUG: soft lockup - CPU#1 stuck for 134s! [syz-executor2:10431]
[ 352.512610] Modules linked in:
[ 352.515804] irq event stamp: 35856
[ 352.519353] hardirqs last enabled at (35855): [<ffffffff874a1734>] _raw_spin_unlock_irqrestore+0x74/0xc0
[ 352.529060] hardirqs last disabled at (35856): [<ffffffff87600901>] interrupt_entry+0xb1/0xf0
[ 352.537731] softirqs last enabled at (162): [<ffffffff87800778>] __do_softirq+0x778/0xaf5
[ 352.546142] softirqs last disabled at (95): [<ffffffff81467a61>] irq_exit+0x1d1/0x200
[ 352.554114] CPU: 1 PID: 10431 Comm: syz-executor2 Not tainted 4.16.0+ #4
[ 352.561560] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 352.570920] RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0
[ 352.576631] RSP: 0018:ffff880184db7780 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 352.584344] RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000
[ 352.591613] RDX: 1ffffffff1162e55 RSI: 0000000000000001 RDI: 0000000000000282
[ 352.598881] RBP: ffff880184db7790 R08: ffffed0035d21962 R09: 0000000000000000
[ 352.606150] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ae90cb08
[ 352.613418] R13: ffff880184db7810 R14: 0000000000000001 R15: ffff8801cb9a5880
[ 352.620696] FS: 00007fc943ad8700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
[ 352.628921] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 352.634800] CR2: 00007fc943ad7db8 CR3: 00000001b070d000 CR4: 00000000001406e0
[ 352.642074] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 352.649346] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 352.656610] Call Trace:
[ 352.659210] snd_virmidi_output_trigger+0x522/0x6c0
[ 352.674379] snd_rawmidi_kernel_write1+0x519/0x700
[ 352.679328] snd_rawmidi_write+0x2e2/0xdc0
[ 352.703684] __vfs_write+0x10b/0x880
[ 352.751248] vfs_write+0x1f8/0x560
[ 352.754805] ksys_write+0xf9/0x250
[ 352.770317] SyS_write+0x24/0x30
[ 352.777491] do_syscall_64+0x29e/0x9d0
[ 352.810491] entry_SYSCALL_64_after_hwframe+0x42/0xb7
[ 352.815683] RIP: 0033:0x455259
[ 352.818870] RSP: 002b:00007fc943ad7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 352.826582] RAX: ffffffffffffffda RBX: 00007fc943ad86d4 RCX: 0000000000455259
[ 352.833855] RDX: 00000000e78e624c RSI: 0000000020000040 RDI: 0000000000000014
[ 352.841123] RBP: 000000000072c010 R08: 0000000000000000 R09: 0000000000000000
[ 352.848390] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[ 352.855661] R13: 00000000000006ca R14: 00000000006fd390 R15: 0000000000000002
[ 352.882430] Kernel panic - not syncing: softlockup: hung tasks
[ 352.888409] CPU: 1 PID: 10431 Comm: syz-executor2 Tainted: G L 4.16.0+ #4
[ 352.896551] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 352.905898] Call Trace:
[ 352.908475] <IRQ>
[ 352.910636] dump_stack+0x1b9/0x294
[ 352.927344] panic+0x22f/0x4de
[ 352.953918] watchdog_timer_fn.cold.5+0xf3/0x126
[ 352.958685] __hrtimer_run_queues+0x3e3/0x10a0
[ 353.006124] hrtimer_interrupt+0x286/0x650
[ 353.010381] smp_apic_timer_interrupt+0x15d/0x710
[ 353.027757] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 353.029387] 1-....: (1 GPs behind) idle=7a2/1/4611686018427387906 softirq=35919/35920 fqs=20
[ 353.034918] apic_timer_interrupt+0xf/0x20
[ 353.034924] </IRQ>
[ 353.034937] RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0
[ 353.039231]
[ 353.047962] RSP: 0018:ffff880184db7780 EFLAGS: 00000282
[ 353.051471] (detected by 0, t=125014 jiffies, g=19098, c=19097, q=977)
[ 353.051482] Sending NMI from CPU 0 to CPUs 1:
[ 353.056298] ORIG_RAX: ffffffffffffff13
[ 353.056309] RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000
[ 353.062594] NMI backtrace for cpu 1
[ 353.062600] CPU: 1 PID: 10431 Comm: syz-executor2 Tainted: G L 4.16.0+ #4
[ 353.062606] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 353.062611] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 353.062616] RSP: 0018:ffff8801db107080 EFLAGS: 00000006
[ 353.062623] RAX: 0000000000010003 RBX: ffff8801db1071aa RCX: ffffffff87462c86
[ 353.062629] RDX: 0000000000000003 RSI: 0000000000000009 RDI: 0000000000000005
[ 353.062634] RBP: ffff8801db107080 R08: ffff8801894c8440 R09: fffffbfff148ee7c
[ 353.062639] R10: fffffbfff148ee7c R11: ffffffff8a4773e0 R12: 0000000000000003
[ 353.062644] R13: 0000000000003033 R14: 000000000000000a R15: ffffffff8a4773e1
[ 353.062650] FS: 00007fc943ad8700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
[ 353.062654] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 353.062659] CR2: 00007fc943ad7db8 CR3: 00000001b070d000 CR4: 00000000001406e0
[ 353.062665] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 353.062670] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 353.062673] Call Trace:
[ 353.062675] <IRQ>
[ 353.062679] put_dec_trunc8+0x266/0x300
[ 353.062682] put_dec+0x3b/0xf0
[ 353.062686] number+0xb94/0xc90
[ 353.062704] vsnprintf+0x13a5/0x1b40
[ 353.062711] sprintf+0xa7/0xd0
[ 353.062718] print_prefix+0x26a/0x3f0
[ 353.062721] msg_print_text+0xca/0x1c0
[ 353.062725] console_unlock+0x4f5/0x1100
[ 353.062751] vprintk_emit+0x6ad/0xdd0
[ 353.062773] vprintk_default+0x28/0x30
[ 353.062777] vprintk_func+0x7a/0xe7
[ 353.062780] printk+0x9e/0xba
[ 353.062791] __show_regs.cold.7+0x86/0x54a
[ 353.062799] show_regs_if_on_stack.constprop.7+0x36/0x39
[ 353.062803] show_trace_log_lvl+0x120/0x25c
[ 353.062811] show_stack+0x38/0x3a
[ 353.062814] dump_stack+0x1b9/0x294
[ 353.062829] panic+0x22f/0x4de
[ 353.062853] watchdog_timer_fn.cold.5+0xf3/0x126
[ 353.062857] __hrtimer_run_queues+0x3e3/0x10a0
[ 353.062898] hrtimer_interrupt+0x286/0x650
[ 353.062903] smp_apic_timer_interrupt+0x15d/0x710
[ 353.062930] apic_timer_interrupt+0xf/0x20
[ 353.062932] </IRQ>
[ 353.062937] RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0
[ 353.062941] RSP: 0018:ffff880184db7780 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 353.062950] RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000
[ 353.062955] RDX: 1ffffffff1162e55 RSI: 0000000000000001 RDI: 0000000000000282
[ 353.062960] RBP: ffff880184db7790 R08: ffffed0035d21962 R09: 0000000000000000
[ 353.062965] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ae90cb08
[ 353.062971] R13: ffff880184db7810 R14: 0000000000000001 R15: ffff8801cb9a5880
[ 353.062975] snd_virmidi_output_trigger+0x522/0x6c0
[ 353.062987] snd_rawmidi_kernel_write1+0x519/0x700
[ 353.062991] snd_rawmidi_write+0x2e2/0xdc0
[ 353.063017] __vfs_write+0x10b/0x880
[ 353.063059] vfs_write+0x1f8/0x560
[ 353.063062] ksys_write+0xf9/0x250
[ 353.063076] SyS_write+0x24/0x30
[ 353.063084] do_syscall_64+0x29e/0x9d0
[ 353.063112] entry_SYSCALL_64_after_hwframe+0x42/0xb7
[ 353.063115] RIP: 0033:0x455259
[ 353.063119] RSP: 002b:00007fc943ad7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 353.063128] RAX: ffffffffffffffda RBX: 00007fc943ad86d4 RCX: 0000000000455259
[ 353.063134] RDX: 00000000e78e624c RSI: 0000000020000040 RDI: 0000000000000014
[ 353.063139] RBP: 000000000072c010 R08: 0000000000000000 R09: 0000000000000000
[ 353.063144] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[ 353.063149] R13: 00000000000006ca R14: 00000000006fd390 R15: 0000000000000002
[ 353.765584] RDX: 1ffffffff1162e55 RSI: 0000000000000001 RDI: 0000000000000282
[ 353.772854] RBP: ffff880184db7790 R08: ffffed0035d21962 R09: 0000000000000000
[ 353.780122] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ae90cb08
[ 353.787390] R13: ffff880184db7810 R14: 0000000000000001 R15: ffff8801cb9a5880
[ 353.794699] snd_virmidi_output_trigger+0x522/0x6c0
[ 353.809878] snd_rawmidi_kernel_write1+0x519/0x700
[ 353.814825] snd_rawmidi_write+0x2e2/0xdc0
[ 353.839166] __vfs_write+0x10b/0x880
[ 353.886693] vfs_write+0x1f8/0x560
[ 353.890241] ksys_write+0xf9/0x250
[ 353.905722] SyS_write+0x24/0x30
[ 353.912894] do_syscall_64+0x29e/0x9d0
[ 353.945884] entry_SYSCALL_64_after_hwframe+0x42/0xb7
[ 353.951072] RIP: 0033:0x455259
[ 353.954261] RSP: 002b:00007fc943ad7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 353.961976] RAX: ffffffffffffffda RBX: 00007fc943ad86d4 RCX: 0000000000455259
[ 353.969244] RDX: 00000000e78e624c RSI: 0000000020000040 RDI: 0000000000000014
[ 353.976513] RBP: 000000000072c010 R08: 0000000000000000 R09: 0000000000000000
[ 353.983779] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[ 353.991051] R13: 00000000000006ca R14: 00000000006fd390 R15: 0000000000000002
[ 354.000710] Dumping ftrace buffer:
[ 354.004343] (ftrace buffer empty)
[ 354.008034] Kernel Offset: disabled
[ 354.011650] Rebooting in 86400 seconds..
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