INFO: task syz-executor.2:25341 blocked for more than 143 seconds. Not tainted 5.2.0+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28928 25341 7605 0x00004006 Call Trace: context_switch kernel/sched/core.c:3252 [inline] __schedule+0x730/0x14d0 kernel/sched/core.c:3878 schedule+0x8c/0x250 kernel/sched/core.c:3942 perf_event_free_task+0x43f/0x630 kernel/events/core.c:11596 copy_process+0x364c/0x64e0 kernel/fork.c:2284 _do_fork+0xec/0xbc0 kernel/fork.c:2370 __do_sys_clone kernel/fork.c:2512 [inline] __se_sys_clone kernel/fork.c:2492 [inline] __x64_sys_clone+0x171/0x230 kernel/fork.c:2492 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: dd fe ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 68 48 83 ec 28 48 89 6c 24 20 48 <8d> 6c 24 20 48 8b 44 24 30 48 89 04 24 48 8b 4c 24 38 48 89 4c 24 RSP: 002b:00007fc9275a1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459829 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000002102001ffe RBP: 000000000075bf20 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc9275a26d4 R13: 00000000004bfce6 R14: 00000000004d17f8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1052: #0: 000000004c1bc5d9 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27e kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/7397: #0: 0000000059ec90d9 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa3/0xc0 fs/file.c:801 2 locks held by getty/7487: #0: 00000000461de154 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008749f352 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7488: #0: 000000007fd039ab (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003306781a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7489: #0: 000000007e16a53f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006e08b81e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7490: #0: 00000000c5d1b7bf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007ca0f08a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7491: #0: 00000000c12382d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c92cc89b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7492: #0: 000000007f53ae3f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000043c4b2b5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 2 locks held by getty/7493: #0: 00000000c5ca67f6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000630d4d67 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1930 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1052 Comm: khungtaskd Not tainted 5.2.0+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x115/0x167 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.8+0x4b/0x84 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16b/0x18d lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x59f/0xb60 kernel/hung_task.c:289 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:mark_held_locks+0x25/0x130 kernel/locking/lockdep.c:3273 Code: 00 00 00 00 00 55 48 8d 87 48 08 00 00 41 89 f0 48 89 e5 48 89 c2 41 57 41 56 48 c1 ea 03 49 89 fe 41 55 41 54 53 48 83 ec 18 <48> 89 45 c8 48 b8 00 00 00 00 00 fc ff df 0f b6 04 02 84 c0 74 08 RSP: 0018:ffff8880a9877bc0 EFLAGS: 00000086 RAX: ffff8880a985e988 RBX: ffff8880a985e140 RCX: 0000000000000002 RDX: 1ffff1101530bd31 RSI: 0000000000000006 RDI: ffff8880a985e140 RBP: ffff8880a9877c00 R08: 0000000000000006 R09: fffffbfff1340569 R10: fffffbfff1340568 R11: ffffffff89a02b47 R12: ffffffff855f0fc2 R13: ffff8880aea34bc0 R14: ffff8880a985e140 R15: ffffffff8a898180 FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000244aff8 CR3: 00000000a1598000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:3314 [inline] lockdep_hardirqs_on+0x424/0x5c0 kernel/locking/lockdep.c:3359 trace_hardirqs_on+0x28/0x1a0 kernel/trace/trace_preemptirq.c:31 seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:305 [inline] gc_worker+0x732/0xae0 net/netfilter/nf_conntrack_core.c:1248 process_one_work+0x856/0x1610 kernel/workqueue.c:2269 worker_thread+0x85/0xb60 kernel/workqueue.c:2415 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352