INFO: task syz-executor6:5600 blocked for more than 120 seconds.
      Not tainted 4.4.115-g55a366596 #14
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D ffff8801c5c678c8 28320  5600   3859 0x00000002
 ffff8801c5c678c8 0000000000000000 0000000000000000 0000000000000000
 0000000000000001 ffff8801c5c67800 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8801d9580000 ffff8800acd6c800 0000000000000000
Call Trace:
 [<ffffffff837663ba>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff83766bb3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3386
 [<ffffffff8376b176>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8376b176>] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621
 [<ffffffff82d427da>] odev_release+0x4a/0x70 sound/core/seq/oss/seq_oss.c:151
 [<ffffffff81523693>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81523bb5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b9e4>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f8a>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f8a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
 [<ffffffff81139428>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8115c882>] get_signal+0x4f2/0x1550 kernel/signal.c:2317
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:247
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff83774669>] int_ret_from_sys_call+0x25/0xa3
INFO: lockdep is turned off.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 3631 Comm: rsyslogd Not tainted 4.4.115-g55a366596 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c6cb1800 task.stack: ffff8800ac740000
RIP: 0010:[<ffffffff83765020>]  [<ffffffff83765020>] __schedule+0xb00/0x1ca0 kernel/sched/core.c:3332
RSP: 0018:ffff8800ac747b30  EFLAGS: 00000286
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffff1003b643fc4 RSI: 0000000000000001 RDI: ffff8801db21fe20
RBP: ffff8800ac747b50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff100158e8f1c R12: ffff8801c695a300
R13: ffff8801c695a300 R14: ffff8801db21f4c0 R15: ffffffff847ebc38
FS:  00007fb86d489700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf88a44000 CR3: 00000000b6544000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 dffffc0000000000 0000000000000000 0000000000000fff 0000000000000000
 ffff8800ac747b70 ffffffff837663ba 1ffff100158e8f76 ffff8800ac747bd0
 ffff8800ac747c58 ffffffff81268e52 ffff8801db200000 ffffffff847eb640
Call Trace:
 [<ffffffff837663ba>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff81268e52>] do_syslog+0x592/0xae0 kernel/printk/printk.c:1327
 [<ffffffff8168ef14>] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39
 [<ffffffff81665d1f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff8151cfc3>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151ee63>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff815217a9>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff815217a9>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff837744df>] entry_SYSCALL_64_fastpath+0x1c/0x98
Code: 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 6e 0f 00 00 49 83 be 60 09 00 00 00 0f 85 3b 05 00 00 48 83 c4 50 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 48 8d 79 44 48 b8 00 00 00 00 00 
NMI backtrace for cpu 1
CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.115-g55a366596 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bacbe000 task.stack: ffff8800bb1e0000
RIP: 0010:[<ffffffff810c3eb7>]  [<ffffffff810c3eb7>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3eb7>]  [<ffffffff810c3eb7>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3eb7>]  [<ffffffff810c3eb7>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3eb7>]  [<ffffffff810c3eb7>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb1e7cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a2f2
RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300
RBP: ffff8800bb1e7ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4220c7010 CR3: 00000000b6544000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000
 ffff8801db31bca0 ffff8800bb1e7d00 ffffffff810b99eb ffffffff839f6200
 0000000000000003 ffff8800bb1e7d60 ffffffff81d0ecf4 0000000000000001
Call Trace:
 [<ffffffff810b99eb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0ecf4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9a84>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81368cba>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368cba>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368cba>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368cba>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811907e8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83774905>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 7b 2f 17 00 4c 89 e7 57 9d 0f 1f