INFO: task syz-executor.5:16292 blocked for more than 143 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26344 16292 14591 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xa8/0x270 kernel/sched/core.c:3944 exp_funnel_lock kernel/rcu/tree_exp.h:308 [inline] synchronize_rcu_expedited+0x544/0x5b0 kernel/rcu/tree_exp.h:816 synchronize_net+0x3b/0x60 net/core/dev.c:9313 packet_release+0x9cf/0xcb0 net/packet/af_packet.c:3033 __sock_release+0x1d5/0x280 net/socket.c:590 sock_release net/socket.c:610 [inline] __sys_socketpair+0x534/0x5d0 net/socket.c:1588 __do_sys_socketpair net/socket.c:1622 [inline] __se_sys_socketpair net/socket.c:1619 [inline] __x64_sys_socketpair+0x97/0xf0 net/socket.c:1619 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8 RSP: 002b:00007fe2f70a5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459879 RDX: 0000000000000002 RSI: 0000000000000003 RDI: 0000000000000011 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 00007fe2f70a66d4 R13: 00000000004c8753 R14: 00000000004df490 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: 00000000d1b38f44 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5256 2 locks held by rsyslogd/8548: #0: 000000001c4aef7f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: 00000000505f4837 (fs_reclaim){+.+.}, at: syslog_print kernel/printk/printk.c:1354 [inline] #1: 00000000505f4837 (fs_reclaim){+.+.}, at: do_syslog kernel/printk/printk.c:1519 [inline] #1: 00000000505f4837 (fs_reclaim){+.+.}, at: do_syslog+0x68e/0x1820 kernel/printk/printk.c:1493 2 locks held by getty/8638: #0: 00000000ba467530 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 000000003929ec95 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8639: #0: 00000000063af49b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 0000000097aa3086 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8640: #0: 00000000d99734b4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000311e6b05 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8641: #0: 00000000ce033316 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000d565de0b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8642: #0: 000000001e0c15cc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 000000008e2d8706 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8643: #0: 000000008d11c1a0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 000000002b8c6a0d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8644: #0: 00000000799e029e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000613eaf30 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc3+ #0 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8719 Comm: kworker/1:4 Not tainted 5.3.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:mark_usage kernel/locking/lockdep.c:3517 [inline] RIP: 0010:__lock_acquire+0x51a/0x4c30 kernel/locking/lockdep.c:3834 Code: ff ff e8 b9 4b 54 00 4c 8b 9d 40 ff ff ff 4c 8b 95 48 ff ff ff 45 8b ab 78 08 00 00 ba 07 00 00 00 45 85 ed 0f 85 d6 0e 00 00 <4c> 89 d6 4c 89 df ba 08 00 00 00 4c 89 95 40 ff ff ff 4c 89 9d 48 RSP: 0018:ffff888068f2faa8 EFLAGS: 00000002 RAX: 000000000000000e RBX: 0000000000000000 RCX: 0000000000060000 RDX: 0000000000000000 RSI: 1ffff1100d1e49bd RDI: ffff888068f24de9 RBP: ffff888068f2fbc0 R08: 0000000000000001 R09: 0000000000000366 R10: ffff888068f24dc8 R11: ffff888068f244c0 R12: 0000000000000366 R13: ffff888068f24dea R14: 0000000000000003 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c4262ed3c0 CR3: 000000008b5a4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4412 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:311 [inline] gc_worker+0x26a/0xde0 net/netfilter/nf_conntrack_core.c:1248 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352