| TITLE: INFO: rcu detected stall in snd_seq_write |
| TYPE: HANG |
| |
| [ 599.875361] rcu: INFO: rcu_sched self-detected stall on CPU |
| [ 599.881199] rcu: 0-....: (105000 ticks this GP) idle=2f6/1/0x4000000000000002 softirq=23001/23001 fqs=26239 |
| [ 599.891361] rcu: (t=105008 jiffies g=49145 q=2382) |
| [ 599.896509] NMI backtrace for cpu 0 |
| [ 599.900150] CPU: 0 PID: 8551 Comm: syz-executor7 Not tainted 4.18.0-next-20180824+ #47 |
| [ 599.908198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 |
| [ 599.917548] Call Trace: |
| [ 599.920132] <IRQ> |
| [ 599.922286] dump_stack+0x1c9/0x2b4 |
| [ 599.944682] nmi_cpu_backtrace.cold.3+0x48/0x88 |
| [ 599.954558] nmi_trigger_cpumask_backtrace+0x151/0x192 |
| [ 599.959858] arch_trigger_cpumask_backtrace+0x14/0x20 |
| [ 599.965052] rcu_dump_cpu_stacks+0x175/0x1c2 |
| [ 599.974486] print_cpu_stall.cold.78+0x2fb/0x59c |
| [ 599.995787] rcu_check_callbacks+0xd4a/0x15a0 |
| [ 600.093087] update_process_times+0x2d/0x70 |
| [ 600.097415] tick_sched_handle+0x9f/0x180 |
| [ 600.101564] tick_sched_timer+0x45/0x130 |
| [ 600.105627] __hrtimer_run_queues+0x3eb/0xff0 |
| [ 600.150990] hrtimer_interrupt+0x2f3/0x750 |
| [ 600.155241] smp_apic_timer_interrupt+0x16d/0x6a0 |
| [ 600.207857] apic_timer_interrupt+0xf/0x20 |
| [ 600.212089] </IRQ> |
| [ 600.214345] RIP: 0010:lock_release+0xa2/0x9f0 |
| [ 600.237744] RSP: 0018:ffff8801aa0078c8 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 |
| [ 600.245455] RAX: 2ec5cd2493d34200 RBX: 1ffff10035400f1e RCX: 0000000000000000 |
| [ 600.252724] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8801a9b56bbc |
| [ 600.259994] RBP: ffff8801aa0079f8 R08: 00000000000010df R09: 0000000000000001 |
| [ 600.267263] R10: ffff8801a9b56be8 R11: 737c3e5c87308161 R12: ffff8801aa0079d0 |
| [ 600.274530] R13: ffff8801c778d4c8 R14: ffff8801aa007ae0 R15: ffff8801a9b56380 |
| [ 600.307088] __might_fault+0x19e/0x1e0 |
| [ 600.310986] _copy_from_user+0x30/0x150 |
| [ 600.315053] snd_seq_write+0x472/0x8d0 |
| [ 600.332960] __vfs_write+0x117/0x9d0 |
| [ 600.379161] vfs_write+0x1fc/0x560 |
| [ 600.382717] ksys_write+0x101/0x260 |
| [ 600.390441] __x64_sys_write+0x73/0xb0 |
| [ 600.398306] do_syscall_64+0x1b9/0x820 |
| [ 600.436382] entry_SYSCALL_64_after_hwframe+0x49/0xbe |
| [ 600.441569] RIP: 0033:0x457089 |
| [ 600.463760] RSP: 002b:00007f09af65dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 |
| [ 600.471476] RAX: ffffffffffffffda RBX: 00007f09af65e6d4 RCX: 0000000000457089 |
| [ 600.478757] RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000003 |
| [ 600.486032] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 |
| [ 600.493302] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff |
| [ 600.500573] R13: 00000000004d78a8 R14: 00000000004ca886 R15: 0000000000000000 |
