INFO: task syz-executor2:14202 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D28424 14202 1847 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 evdev_flush+0x6d/0x120 drivers/input/evdev.c:350 filp_close+0x9f/0x130 fs/open.c:1148 __close_fd+0x14a/0x220 fs/file.c:638 SYSC_close fs/open.c:1167 [inline] SyS_close+0x46/0x80 fs/open.c:1165 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x411151 RSP: 002b:00007fffb0e73210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000411151 RDX: 0000000000000000 RSI: 0000000000730bf0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000000000a0 R09: ffffffffffffffff R10: 000000000072bfa0 R11: 0000000000000293 R12: 000000000000000c R13: 00000000000739c8 R14: 0000000000000139 R15: badc0ffeebadface Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.?}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1761: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 1 lock held by syz-executor2/14202: #0: (&evdev->mutex){+.+.}, at: [] evdev_flush+0x6d/0x120 drivers/input/evdev.c:350 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.71+ #8 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6252 Comm: syz-executor5 Not tainted 4.14.71+ #8 task: ffff8801c8a6c680 task.stack: ffff8801a1080000 RIP: 0010:__sanitizer_cov_trace_pc+0x1d/0x60 kernel/kcov.c:65 RSP: 0018:ffff8801a10879a8 EFLAGS: 00000246 RAX: ffff8801c8a6c680 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff10034210f63 RDI: ffffc90000046039 RBP: ffff8801a1087ae0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa8a95960 R13: 1ffff10034210f3d R14: ffffed0034210f62 R15: ffffc90000046040 FS: 00007f2bc2445700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000206f7000 CR3: 00000001c43fe004 CR4: 00000000001606b0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: ___bpf_prog_run+0x91/0x5c70 kernel/bpf/core.c:885 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 de 01 00 48 85 c0 74 1a 65 8b 15 2b 25 11 59 81 e2 00 01 1f 00 75 0b <8b> 90 a8 11 00 00 83 fa 01 74 01 c3 48 c7 c2 00 00 00 81 48 81