[32142] 0 32142 18146 8714 24 3 0 0 syz-executor1 [32178] 0 32178 18146 13203 31 3 0 0 syz-executor3 [32247] 0 32247 18146 13203 31 3 0 0 syz-executor3 [32306] 0 32306 18146 13203 31 3 0 0 syz-executor3 [32363] 0 32363 18146 13203 31 3 0 0 syz-executor3 INFO: task syz-executor4:19880 blocked for more than 140 seconds. Not tainted 4.14.94+ #12 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [32417] 0 32417 18179 8715 25 3 0 1000 syz-executor4 syz-executor4 D29968 19880 1859 0x00000000 Call Trace: [32419] 0 32419 18146 13203 31 3 0 0 syz-executor3 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [32420] 0 32420 18179 8715 25 3 0 1000 syz-executor4 [32477] 0 32477 18146 13203 31 3 0 0 syz-executor3 lock_sock_nested+0xe1/0x100 net/core/sock.c:2761 lock_sock include/net/sock.h:1456 [inline] packet_setsockopt+0x592/0x2830 net/packet/af_packet.c:3746 [32532] 0 32532 18146 13203 31 3 0 0 syz-executor3 [32605] 0 32605 18146 13203 31 3 0 0 syz-executor3 INFO: task syz-executor4:19882 blocked for more than 140 seconds. Not tainted 4.14.94+ #12 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [32653] 0 32653 18146 13203 31 3 0 0 syz-executor3 syz-executor4 D29968 19882 1859 0x00000000 Call Trace: [32701] 0 32701 18146 13203 31 3 0 0 syz-executor3 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [32762] 0 32762 18146 13203 31 3 0 0 syz-executor3 lock_sock_nested+0xe1/0x100 net/core/sock.c:2761 lock_sock include/net/sock.h:1456 [inline] packet_setsockopt+0x592/0x2830 net/packet/af_packet.c:3746 [ 359] 0 359 18146 13203 31 3 0 0 syz-executor3 [ 402] 0 402 18146 13203 31 3 0 0 syz-executor3 [ 480] 0 480 18146 13203 31 3 0 0 syz-executor3 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1755: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 [ 532] 0 532 18146 13203 31 3 0 0 syz-executor3 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by kworker/u4:7/17940: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 ============================================= [ 592] 0 592 18146 13203 31 3 0 0 syz-executor3 [ 623] 0 623 18146 8714 24 3 0 0 syz-executor1 [ 647] 0 647 18146 13203 31 3 0 0 syz-executor3 NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.94+ #12 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1 Comm: init Not tainted 4.14.94+ #12 task: ffff8881da9d0000 task.stack: ffff8881da9d8000 RIP: 0010:check_preemption_disabled+0x42/0x1f0 lib/smp_processor_id.c:53 RSP: 0000:ffff8881da9def68 EFLAGS: 00000097 RAX: 0000000000000000 RBX: 0000000000033128 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffffb3f4ffc0 RDI: ffffffffb3f50000 RBP: ffff8881da9df048 R08: 000000000000289b R09: 0000000000000000 R10: ffff8881da9d08a8 R11: 0000000000000001 R12: 1ffff1103b53bdf4 R13: 0000000000000000 R14: ffffffffb44bffc0 R15: ffff8881da9df020 FS: 00007f41118e67a0(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000040432e CR3: 00000001d5be4005 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: perf_trace_lock+0x11e/0x4e0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4d8/0x730 kernel/locking/lockdep.c:4009 ? 0xffffffffb2000000 Code: 8b 25 13 ef 48 4d 65 8b 05 2c 4c 49 4d a9 ff ff ff 7f 74 18 e8 10 fd 77 ff e8 0b fd 77 ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f e8 f8 fc 77 ff 9c 58 0f 1f 44 00 00 f6 c4 02 74 dc e8 e7 fc [ 662] 0 662 18212 8720 24 3 0 0 syz-executor1 [ 741] 0 741 18146 13203 31 3 0 0 syz-executor3 [ 797] 0 797 18146 13203 31 3 0 0 syz-executor3