INFO: task syz-executor0:10151 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc2-next-20180904+ #55
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D24952 10151   4264 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575
 __mutex_lock_common kernel/locking/mutex.c:1003 [inline]
 __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
 snd_seq_ioctl+0x221/0x440 sound/core/seq/seq_clientmgr.c:2137
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572a9
Code: 2c 00 00 e9 49 ff ff ff cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 29 48 83 ec 10 48 89 6c 24 08 48 <8d> 6c 24 08 48 8b 42 08 48 8b 40 08 48 89 04 24 e8 02 d3 fc ff 48
RSP: 002b:00007f48ccde6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f48ccde76d4 RCX: 00000000004572a9
RDX: 00000000200000c0 RSI: 00000000c08c5332 RDI: 000000000000000b
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d0b98 R14: 00000000004bf3e0 R15: 0000000000000001
INFO: task syz-executor0:10153 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc2-next-20180904+ #55
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D25896 10153   4264 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575
 __mutex_lock_common kernel/locking/mutex.c:1003 [inline]
 __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
 snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021
 __vfs_write+0x117/0x9d0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572a9
Code: 2c 00 00 e9 49 ff ff ff cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 29 48 83 ec 10 48 89 6c 24 08 48 <8d> 6c 24 08 48 8b 42 08 48 8b 40 08 48 89 04 24 e8 02 d3 fc ff 48
RSP: 002b:00007f48ccdc5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48ccdc66d4 RCX: 00000000004572a9
RDX: 0000000000000020 RSI: 0000000020000440 RDI: 0000000000000005
RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d8218 R14: 00000000004c1c98 R15: 0000000000000002
INFO: task syz-executor0:10157 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc2-next-20180904+ #55
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D25896 10157   4264 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575
 __mutex_lock_common kernel/locking/mutex.c:1003 [inline]
 __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
 snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021
 __vfs_write+0x117/0x9d0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572a9
Code: 2c 00 00 e9 49 ff ff ff cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 29 48 83 ec 10 48 89 6c 24 08 48 <8d> 6c 24 08 48 8b 42 08 48 8b 40 08 48 89 04 24 e8 02 d3 fc ff 48
RSP: 002b:00007f48ccda4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48ccda56d4 RCX: 00000000004572a9
RDX: 0000000000000010 RSI: 0000000020000540 RDI: 0000000000000005
RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d8398 R14: 00000000004c1e78 R15: 0000000000000003
INFO: task syz-executor0:10167 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc2-next-20180904+ #55
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D25408 10167   4264 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575
 __mutex_lock_common kernel/locking/mutex.c:1003 [inline]
 __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
 snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021
 __vfs_write+0x117/0x9d0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572a9
Code: 2c 00 00 e9 49 ff ff ff cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 29 48 83 ec 10 48 89 6c 24 08 48 <8d> 6c 24 08 48 8b 42 08 48 8b 40 08 48 89 04 24 e8 02 d3 fc ff 48
RSP: 002b:00007f48ccd62c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48ccd636d4 RCX: 00000000004572a9
RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 000000000000000b
RBP: 00000000009303c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d8680 R14: 00000000004cb10e R15: 0000000000000005

Showing all locks held in the system:
1 lock held by khungtaskd/791:
 #0: 0000000052cc7661 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436
1 lock held by rsyslogd/4129:
2 locks held by getty/4220:
 #0: 00000000c5422ca5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000004b5ce205 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4221:
 #0: 00000000d7be13c8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000063a07518 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4222:
 #0: 000000004de0dec1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000663d3eb5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4223:
 #0: 000000007b251c25 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000066c31041 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4224:
 #0: 00000000bfd09c12 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000e571e6fe (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4225:
 #0: 0000000003b9d4e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000b3abd13f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4226:
 #0: 000000005b8f603e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000008b4c2d72 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
1 lock held by syz-executor0/10143:
1 lock held by syz-executor0/10151:
 #0: 0000000090cae0bb (&client->ioctl_mutex){+.+.}, at: snd_seq_ioctl+0x221/0x440 sound/core/seq/seq_clientmgr.c:2137
1 lock held by syz-executor0/10153:
 #0: 0000000090cae0bb (&client->ioctl_mutex){+.+.}, at: snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021
1 lock held by syz-executor0/10157:
 #0: 0000000090cae0bb (&client->ioctl_mutex){+.+.}, at: snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021
1 lock held by syz-executor0/10167:
 #0: 0000000090cae0bb (&client->ioctl_mutex){+.+.}, at: snd_seq_write+0x1f1/0x8d0 sound/core/seq/seq_clientmgr.c:1021

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 791 Comm: khungtaskd Not tainted 4.19.0-rc2-next-20180904+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb39/0x1040 kernel/hung_task.c:265
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.133 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 10143 Comm: syz-executor0 Not tainted 4.19.0-rc2-next-20180904+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_release kernel/locking/lockdep.c:3671 [inline]
RIP: 0010:lock_release+0x29a/0x9f0 kernel/locking/lockdep.c:3920
Code: 05 6b 19 56 08 0f 84 88 04 00 00 44 89 da 4c 89 f9 4c 89 ee 4c 89 f7 44 89 9d d8 fe ff ff e8 cd 15 ff ff 44 8b 9d d8 fe ff ff <48> 85 c0 0f 84 b9 04 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78
RSP: 0018:ffff8801db007930 EFLAGS: 00000082
RAX: ffff880188c309d0 RBX: 1ffff1003b600f2b RCX: ffff8801db007978
RDX: 1ffff1003b600f2f RSI: 0000000000000000 RDI: ffff880188c309e0
RBP: ffff8801db007a60 R08: 0000000000000000 R09: fffffbfff13962e1
R10: ffffffff89b5c820 R11: 0000000000000003 R12: ffff8801db007a38
R13: ffffffff89cb1720 R14: ffff880188c30140 R15: ffff8801db007978
FS:  00007f48cce08700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a00000 CR3: 00000001cf458000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_unlock_irqrestore+0x1f/0xc0 kernel/locking/spinlock.c:184
 debug_object_deactivate+0x2eb/0x450 lib/debugobjects.c:569
 debug_hrtimer_deactivate kernel/time/hrtimer.c:421 [inline]
 debug_deactivate kernel/time/hrtimer.c:471 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1368 [inline]
 __hrtimer_run_queues+0x2b6/0xff0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x16d/0x6a0 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184
Code: 68 be 11 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 21 48 83 3d 3e da 3a 01 00 74 0e 48 89 df 57 9d <0f> 1f 44 00 00 eb bb 0f 0b 0f 0b e8 0f 0e e5 fa eb 97 e8 08 0e e5
RSP: 0018:ffff880190fbf878 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 1ffff10031186134
RDX: 1ffffffff10237cd RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff880190fbf888 R08: ffff880188c30980 R09: 0000000000000006
R10: ffff880188c30140 R11: 0000000000000000 R12: ffff8801d60ca198
R13: 0000000000000000 R14: ffff8801d60ca198 R15: 0000000000000286
 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline]
 snd_seq_prioq_cell_out+0x1e3/0x350 sound/core/seq/seq_prioq.c:253
 snd_seq_check_queue.part.4+0x11e/0x360 sound/core/seq/seq_queue.c:271
 snd_seq_check_queue sound/core/seq/seq_queue.c:255 [inline]
 snd_seq_enqueue_event+0x346/0x4d0 sound/core/seq/seq_queue.c:343
 snd_seq_client_enqueue_event+0x2a5/0x510 sound/core/seq/seq_clientmgr.c:957
 snd_seq_write+0x3f1/0x8d0 sound/core/seq/seq_clientmgr.c:1074
 __vfs_write+0x117/0x9d0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572a9
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f48cce07c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48cce086d4 RCX: 00000000004572a9
RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d8680 R14: 00000000004cb10e R15: 0000000000000000