INFO: task syz-executor7:5683 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-executor7 D ffff8800afc878c8 28264 5683 3848 0x00000002 ffff8800afc878c8 0000000000000000 0000000000000000 0000000000000000 0000000000000001 ffff8800afc87800 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8 ffff8801d9b49800 ffff8800b60e1800 0000000000000000 Call Trace: [] schedule+0x7a/0x1b0 kernel/sched/core.c:3353 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3386 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621 [] odev_release+0x4a/0x70 sound/core/seq/oss/seq_oss.c:151 [] __fput+0x233/0x6d0 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x104/0x180 kernel/task_work.c:115 [] exit_task_work include/linux/task_work.h:21 [inline] [] do_exit+0x82a/0x2a10 kernel/exit.c:755 [] do_group_exit+0x108/0x320 kernel/exit.c:885 [] get_signal+0x4f2/0x1550 kernel/signal.c:2317 [] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:247 [] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347 [] 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: 486 Comm: khungtaskd Not tainted 4.4.115-g55a366596 #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bac64800 task.stack: ffff8800bb3d0000 RIP: 0010:[] [] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline] RIP: 0010:[] [] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline] RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800bb3d7cb8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a2f2 RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300 RBP: ffff8800bb3d7ce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246 R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c422e61000 CR3: 00000000ac0c6000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000 ffff8801db31bca0 ffff8800bb3d7d00 ffffffff810b99eb ffffffff839f6200 0000000000000003 ffff8800bb3d7d60 ffffffff81d0ecf4 0000000000000001 Call Trace: [] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6fa/0xae0 kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] 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 NMI backtrace for cpu 1 CPU: 1 PID: 3633 Comm: rsyslogd Not tainted 4.4.115-g55a366596 #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800ad38b000 task.stack: ffff8800ac268000 RIP: 0010:[] [] __list_add+0xfc/0x1c0 lib/list_debug.c:41 RSP: 0018:ffff8800ac26fab0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8800ac26fbd0 RCX: ffff8800ac26fbe8 RDX: 1ffffffff0856f3f RSI: ffffffff842b79f8 RDI: ffff8800ac26fbf0 RBP: ffff8800ac26fac0 R08: ffffffff842b79f8 R09: 0000000000000001 R10: ffffffff83844400 R11: 1ffff1001584df20 R12: 1ffff1001584df5d R13: ffffffff842b79f8 R14: ffffffff842b7a00 R15: 0000000000000001 FS: 00007f9b2aa04700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a35a5c000 CR3: 00000000ac0c6000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8800ac26fb48 ffffffff842b79c0 ffff8800ac26fb70 ffffffff81220a73 ffffffff83764fe8 0000000000000001 0000000000000292 0000000041b58ab3 ffffffff83fa9d44 ffffffff81220810 ffff8801db31fdb8 ffff8801db31fde0 Call Trace: [] list_add include/linux/list.h:63 [inline] [] __add_wait_queue include/linux/wait.h:116 [inline] [] prepare_to_wait_event+0x263/0x420 kernel/sched/wait.c:214 [] do_syslog+0x5ab/0xae0 kernel/printk/printk.c:1327 [] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39 [] proc_reg_read+0xef/0x170 fs/proc/inode.c:202 [] __vfs_read+0x103/0x440 fs/read_write.c:432 [] vfs_read+0x123/0x3a0 fs/read_write.c:454 [] SYSC_read fs/read_write.c:569 [inline] [] SyS_read+0xd9/0x1b0 fs/read_write.c:562 [] entry_SYSCALL_64_fastpath+0x1c/0x98 Code: 85 bf 00 00 00 4c 89 e2 4c 89 63 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 93 00 00 00 49 89 1c 24 5b 41 5c <41> 5d 41 5e 5d c3 4d 89 e9 4c 89 e1 48 c7 c2 20 e5 9f 83 be 1d