INFO: task syz-executor.1:12532 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28864 pid:12532 ppid: 8472 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 isotp_init+0x452/0x530 net/can/isotp.c:1380 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socket+0xef/0x200 net/socket.c:1499 __do_sys_socket net/socket.c:1508 [inline] __se_sys_socket net/socket.c:1506 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1506 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f4a62a4bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000006 RSI: 0000000000000002 RDI: 000000000000001d RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc2a17258f R14: 00007f4a62a4c9c0 R15: 000000000119bf8c INFO: task syz-executor.1:12534 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:29656 pid:12534 ppid: 8472 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 isotp_init+0x452/0x530 net/can/isotp.c:1380 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socket+0xef/0x200 net/socket.c:1499 __do_sys_socket net/socket.c:1508 [inline] __se_sys_socket net/socket.c:1506 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1506 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f4a62a2ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000006 RSI: 0000000000000002 RDI: 000000000000001d RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffc2a17258f R14: 00007f4a62a2b9c0 R15: 000000000119c034 Showing all locks held in the system: 3 locks held by kworker/u4:3/150: 1 lock held by khungtaskd/1658: #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8316: #0: ffff88801c5bd770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by agetty/8379: #0: ffff888022421098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f5c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1aa0 drivers/tty/n_tty.c:2158 1 lock held by syz-executor.1/12532: #0: ffffffff8ca45590 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 1 lock held by syz-executor.1/12534: #0: ffffffff8ca45590 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd43/0xfa0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 150 Comm: kworker/u4:3 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:preempt_count_add+0x4a/0x140 kernel/sched/core.c:4722 Code: c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 e1 00 00 00 8b 15 a8 53 be 0d 65 01 1d 01 5d b4 7e 85 d2 75 11 65 8b 05 f6 5c b4 7e <0f> b6 c0 3d f4 00 00 00 7f 64 65 8b 05 e5 5c b4 7e 25 ff ff ff 7f RSP: 0018:ffffc900014cfb70 EFLAGS: 00000246 RAX: 0000000080000201 RBX: 0000000000000001 RCX: 1ffffffff1e17ccc RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffffff8b06db40 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8736ff82 R11: 0000000000000000 R12: ffffffff8b06db40 R13: 0000000000003e42 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec37979000 CR3: 000000001501d000 CR4: 0000000000350ef0 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_lock+0xe/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] nf_conntrack_lock net/netfilter/nf_conntrack_core.c:91 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2199 [inline] nf_ct_iterate_cleanup+0x183/0x400 net/netfilter/nf_conntrack_core.c:2244 nf_conntrack_cleanup_net_list+0x81/0x250 net/netfilter/nf_conntrack_core.c:2431 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:190 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:604 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296