INFO: task syz-executor0:9342 blocked for more than 140 seconds. Not tainted 4.4.157+ #101 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D ffff8801d72c7d58 28816 9342 2124 0x00000004 ffff8801d72c7d58 0000000000000000 ffff8800a443b848 ffffed0014887708 ffff8800a443af00 ffff8801db71f180 ffff8801db71f1a8 ffff8801db71e898 ffff8801db71e880 ffff8801da6497c0 ffff8800a443af80 0000000000000000 Call Trace: [] schedule+0x7a/0x1b0 kernel/sched/core.c:3355 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x307/0x840 kernel/locking/mutex.c:621 [] evdev_flush+0x72/0x120 drivers/input/evdev.c:350 [] filp_close+0xa7/0x140 fs/open.c:1095 [] __close_fd+0x1a1/0x2b0 fs/file.c:650 [] SYSC_close fs/open.c:1114 [inline] [] SyS_close+0x4c/0x90 fs/open.c:1112 [] entry_SYSCALL_64_fastpath+0x1e/0x9a 1 lock held by syz-executor0/9342: #0: (&evdev->mutex){+.+.+.}, at: [] evdev_flush+0x72/0x120 drivers/input/evdev.c:350 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.157+ #101 task: ffff8801da6c2f80 task.stack: ffff8800001e0000 RIP: 0010:[] [] native_apic_mem_write arch/x86/include/asm/apic.h:93 [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+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0000:ffff8800001e7cc8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300 RBP: ffff8800001e7cf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000003000000 R14: ffffffff82e5f3a0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f17940bd000 CR3: 00000000ba0f4000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff82e5f3a0 ffffffff831a3020 0000000000000007 fffffbfff06344e4 0000000000000008 ffff8800001e7d10 ffffffff81091a11 ffffffff82920920 0000000000000003 ffff8800001e7d68 ffffffff81a604a2 ffffffff813919a5 Call Trace: [] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold.0+0x70/0xae 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.cold.0+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510 Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f2 NMI backtrace for cpu 1 CPU: 1 PID: 9295 Comm: syz-executor4 Not tainted 4.4.157+ #101 task: ffff8800a6ad0000 task.stack: ffff8801c0940000 RIP: 0010:[] [] __read_once_size include/linux/compiler.h:218 [inline] RIP: 0010:[] [] seccomp_run_filters kernel/seccomp.c:184 [inline] RIP: 0010:[] [] __seccomp_phase1_filter kernel/seccomp.c:606 [inline] RIP: 0010:[] [] seccomp_phase1+0x122/0xbf0 kernel/seccomp.c:685 RSP: 0018:ffff8801c0947d48 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: ffff8800a6ad0000 RCX: 1ffff10038128ff3 RDX: 1ffff10014d5a0f9 RSI: ffffffff812f92ee RDI: ffff8800a6ad07c8 RBP: ffff8801c0947e50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffff8801c0947e28 R13: dffffc0000000000 R14: ffff8801c0947ea0 R15: ffff8801c0947f58 FS: 00007fead29a1700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002081b000 CR3: 00000000b69cf000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000000 0000000000000000 0000000000000000 ffff8800a6ad08e8 0000000000000100 0000000000000000 1ffff10038128fb1 000000ca00000000 0000000041b58ab3 ffffffff82c4426e ffffffff812f91f0 00000000c000003e Call Trace: [] syscall_trace_enter_phase1+0x2c8/0x480 arch/x86/entry/common.c:134 [] tracesys+0xd/0x44 Code: 00 00 e8 92 ba ff ff 0f ae e8 65 48 8b 1c 25 80 67 01 00 48 8d bb c8 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 64 08 00 00 48 8b 9b c8 07 00 00 48 85 db 0f