INFO: task syz-executor3:12269 blocked for more than 140 seconds. Not tainted 4.19.0+ #213 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D24976 12269 1249 0x20020004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 schedule+0xfe/0x460 kernel/sched/core.c:3524 exp_funnel_lock kernel/rcu/tree_exp.h:319 [inline] _synchronize_rcu_expedited.constprop.58+0x8df/0x9d0 kernel/rcu/tree_exp.h:620 synchronize_rcu_expedited+0x27/0xa0 kernel/rcu/tree_exp.h:758 synchronize_rcu.part.53+0x84/0x120 kernel/rcu/tree_plugin.h:857 synchronize_rcu+0x27/0xa0 kernel/rcu/tree_plugin.h:860 synchronize_net+0x4d/0x60 net/core/dev.c:9064 __unregister_prot_hook+0x2b8/0x340 net/packet/af_packet.c:349 packet_do_bind+0x78c/0xdb0 net/packet/af_packet.c:3085 packet_bind+0x15d/0x1b0 net/packet/af_packet.c:3168 __sys_bind+0x331/0x440 net/socket.c:1483 __do_sys_bind net/socket.c:1494 [inline] __se_sys_bind net/socket.c:1492 [inline] __ia32_sys_bind+0x72/0xb0 net/socket.c:1492 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f24a29 Code: Bad RIP value. RSP: 002b:00000000f5eff0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000169 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000205a2000 RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1008: #0: 0000000036286521 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/5549: #0: 00000000663333dd (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5639: #0: 0000000099868263 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000030ff3316 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5640: #0: 00000000f562e5e9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000022c07441 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5641: #0: 00000000aa16dcfb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000468cb85a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5642: #0: 00000000b4c2a0e8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000005c96a0b3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5643: #0: 000000007767d8d6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000007ba2d266 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5644: #0: 00000000457a6052 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000009fa5f0fd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5645: #0: 0000000036488d53 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000006d175a67 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 1 lock held by syz-executor3/12269: #0: 00000000beb6a1e8 (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1492 [inline] #0: 00000000beb6a1e8 (sk_lock-AF_PACKET){+.+.}, at: packet_do_bind+0x9c/0xdb0 net/packet/af_packet.c:3047 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1008 Comm: khungtaskd Not tainted 4.19.0+ #213 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+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.1+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb3e/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11566 Comm: kworker/1:0 Not tainted 4.19.0+ #213 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:validate_chain kernel/locking/lockdep.c:2317 [inline] RIP: 0010:__lock_acquire+0x835/0x4c20 kernel/locking/lockdep.c:3341 Code: ff ff ff 4c 89 9c 24 90 00 00 00 e8 75 55 ff ff 4c 8b 9c 24 90 00 00 00 85 c0 0f 84 4d 09 00 00 48 b8 00 00 00 00 00 fc ff df <48> 8b 54 24 70 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 7e RSP: 0018:ffff8801bff77040 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000033a29f9e RCX: ffff880198534e80 RDX: 000000002202241b RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8801bff773c8 R08: ffff880198534f18 R09: 0000000000000008 R10: 0000000000000078 R11: ffff880198534600 R12: 0000000000000000 R13: 00000000ee5f847d R14: ebad240b2202241b R15: ffff880198534ef8 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001aa61e8 CR3: 00000001bcf1c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 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:302 [inline] gc_worker+0x2b3/0x1130 net/netfilter/nf_conntrack_core.c:1157 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350