capability: warning: `syz-executor0' uses 32-bit capabilities (legacy support in use)
INFO: task syz-executor7:5692 blocked for more than 120 seconds.
      Not tainted 4.4.116-g17c7c49 #17
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D ffff8800b1017768 28360  5692   3741 0x00000004
 ffff8800b1017768 0000000000000000 0000000000000000 0000000000000000
 0000000000000001 ffff8800b1017700 ffff8801db21fdb8 ffff8801db21fde0
 ffff8801db21f4d8 ffff8800b76f4800 ffff8801c4523000 0000000000000000
Call Trace:
 [<ffffffff837668ca>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff837670c3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3386
 [<ffffffff8376b686>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8376b686>] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621
 [<ffffffff82d42a7f>] odev_open+0x5f/0x90 sound/core/seq/oss/seq_oss.c:136
 [<ffffffff82ca1a01>] soundcore_open+0x321/0x630 sound/sound_core.c:639
 [<ffffffff81529d8b>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:388
 [<ffffffff81517f5b>] do_dentry_open+0x59b/0xba0 fs/open.c:749
 [<ffffffff8151b820>] vfs_open+0x110/0x210 fs/open.c:862
 [<ffffffff8154ca83>] do_last fs/namei.c:3217 [inline]
 [<ffffffff8154ca83>] path_openat+0x923/0x3940 fs/namei.c:3353
 [<ffffffff81552727>] do_filp_open+0x197/0x290 fs/namei.c:3388
 [<ffffffff8151c1f9>] do_sys_open+0x369/0x660 fs/open.c:1038
 [<ffffffff8151c560>] SYSC_openat fs/open.c:1065 [inline]
 [<ffffffff8151c560>] SyS_openat+0x30/0x40 fs/open.c:1059
 [<ffffffff83774a1f>] entry_SYSCALL_64_fastpath+0x1c/0x98
INFO: lockdep is turned off.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.116-g17c7c49 #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84217840 task.stack: ffffffff84200000
RIP: 0010:[<ffffffff810d232b>]  [<ffffffff810d232b>] rdtsc arch/x86/include/asm/msr.h:124 [inline]
RIP: 0010:[<ffffffff810d232b>]  [<ffffffff810d232b>] rdtsc_ordered arch/x86/include/asm/msr.h:152 [inline]
RIP: 0010:[<ffffffff810d232b>]  [<ffffffff810d232b>] pvclock_get_nsec_offset arch/x86/include/asm/pvclock.h:74 [inline]
RIP: 0010:[<ffffffff810d232b>]  [<ffffffff810d232b>] __pvclock_read_cycles arch/x86/include/asm/pvclock.h:91 [inline]
RIP: 0010:[<ffffffff810d232b>]  [<ffffffff810d232b>] pvclock_clocksource_read+0xcb/0x4a0 arch/x86/kernel/pvclock.c:84
RSP: 0018:ffffffff84207b48  EFLAGS: 00000086
RAX: 00000000f8b142f0 RBX: ffff88021fffd000 RCX: ffff88021fffd01b
RDX: 0000000000000082 RSI: ffffffff839fe320 RDI: ffff88021fffd01c
RBP: ffffffff84207bd0 R08: ffff88021fffd018 R09: 0000000000000006
R10: ffffed0043fffa01 R11: ffff88021fffd017 R12: dffffc0000000000
R13: ffff88021fffd003 R14: ffff88021fffd01d R15: ffff88021fffd010
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3be3ce6000 CR3: 00000000af836000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 0000000000000000 0000000000000002 0000000000000001
 ffffffff84207bf0 0000000000000046 ffff88021fffd017 ffff88021fffd01b
 ffff88021fffd00f ffffed0043fffa03 ffff88021fffd01c ffff88021fffd008
Call Trace:
 [<ffffffff810d00e3>] kvm_clock_read+0x23/0x40 arch/x86/kernel/kvmclock.c:91
 [<ffffffff810d0109>] kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:98
 [<ffffffff812c01ba>] tk_clock_read kernel/time/timekeeping.c:140 [inline]
 [<ffffffff812c01ba>] timekeeping_get_delta kernel/time/timekeeping.c:234 [inline]
 [<ffffffff812c01ba>] timekeeping_get_ns kernel/time/timekeeping.c:340 [inline]
 [<ffffffff812c01ba>] ktime_get+0xea/0x1d0 kernel/time/timekeeping.c:756
 [<ffffffff812cfd15>] clockevents_program_event+0x1a5/0x350 kernel/time/clockevents.c:331
 [<ffffffff812d4c88>] tick_program_event+0xa8/0x110 kernel/time/tick-oneshot.c:47
 [<ffffffff812ac746>] hrtimer_force_reprogram kernel/time/hrtimer.c:601 [inline]
 [<ffffffff812ac746>] __remove_hrtimer+0x1f6/0x250 kernel/time/hrtimer.c:929
 [<ffffffff812ad173>] remove_hrtimer kernel/time/hrtimer.c:958 [inline]
 [<ffffffff812ad173>] hrtimer_try_to_cancel+0x2b3/0x660 kernel/time/hrtimer.c:1059
 [<ffffffff812ad542>] hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1079
 [<ffffffff812d583e>] tick_nohz_restart+0x1e/0x190 kernel/time/tick-sched.c:559
 [<ffffffff812d7897>] tick_nohz_restart_sched_tick kernel/time/tick-sched.c:726 [inline]
 [<ffffffff812d7897>] tick_nohz_idle_exit+0x247/0x3d0 kernel/time/tick-sched.c:946
 [<ffffffff81221875>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81221875>] cpu_startup_entry+0x2a5/0x8f0 kernel/sched/idle.c:301
 [<ffffffff83761959>] rest_init+0x189/0x190 init/main.c:410
 [<ffffffff84821811>] start_kernel+0x6b9/0x6ee init/main.c:682
 [<ffffffff84820312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84820454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185
Code: 5b 17 48 c1 e8 03 48 89 4d b0 4c 8d 43 18 4c 01 e0 4c 89 5d a8 4c 8d 7b 10 48 89 45 c0 4c 8d 73 1d eb 03 41 89 d1 0f ae e8 0f 31 <48> c1 e2 20 48 8b 7d b8 48 8b 75 d0 48 09 d0 41 0f b6 12 48 89 
NMI backtrace for cpu 1
CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.116-g17c7c49 #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb1ae000 task.stack: ffff8800bb030000
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:ffff8800bb037cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a2f2
RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300
RBP: ffff8800bb037ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffbfff0ad7e24 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa02a383000 CR3: 00000000af836000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f3e0 ffffffff847ef800 fffffbfff08fd9b4 dffffc0000000000
 ffff8801db31bca0 ffff8800bb037d00 ffffffff810b99eb ffffffff839f61c0
 0000000000000003 ffff8800bb037d60 ffffffff81d0eed4 0000000000000001
Call Trace:
 [<ffffffff810b99eb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0eed4>] 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
 [<ffffffff81368caa>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368caa>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368caa>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368caa>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811907e8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83774e45>] 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