INFO: task kworker/u4:23:15964 blocked for more than 146 seconds. Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:23 state:D stack:20472 pid:15964 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x9d1/0xe40 kernel/sched/core.c:6555 schedule+0xcb/0x190 kernel/sched/core.c:6631 rxrpc_destroy_all_calls+0x585/0x680 net/rxrpc/call_object.c:733 rxrpc_exit_net+0x6a/0xc0 net/rxrpc/net_ns.c:125 ops_exit_list net/core/net_namespace.c:169 [inline] cleanup_net+0x758/0xc60 net/core/net_namespace.c:606 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d3238d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d3240d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d323700 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4741: #0: ffff888027868098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177 3 locks held by kworker/0:20/10074: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc90014fcfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 #2: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:277 3 locks held by kworker/u4:23/15964: #0: ffff8880129cb138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc900168f7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 #2: ffffffff8e456350 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:568 2 locks held by kworker/u4:25/15976: 3 locks held by kworker/0:5/19895: 3 locks held by kworker/0:10/19904: #0: ffff888028026538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc9000502fd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 #2: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4624 2 locks held by kworker/0:12/19906: #0: ffff888012866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc9000505fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 2 locks held by syz-executor.5/29111: 1 lock held by syz-executor.1/29125: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.1/29129: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.1/29133: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.1/29135: #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:75 [inline] #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x773/0xec0 net/core/rtnetlink.c:6138 1 lock held by syz-executor.0/29126: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.0/29130: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.0/29134: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.0/29136: #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:75 [inline] #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x773/0xec0 net/core/rtnetlink.c:6138 1 lock held by syz-executor.4/29124: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.4/29128: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.4/29132: #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:75 [inline] #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x773/0xec0 net/core/rtnetlink.c:6138 3 locks held by syz-executor.2/29123: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 #1: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: vlan_ioctl_handler+0x112/0x970 net/8021q/vlan.c:553 #2: ffffffff8d328d38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #2: ffffffff8d328d38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46f/0x890 kernel/rcu/tree_exp.h:946 1 lock held by syz-executor.2/29127: #0: ffffffff8e4488c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x525/0x770 net/socket.c:1248 1 lock held by syz-executor.2/29131: #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:75 [inline] #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x773/0xec0 net/core/rtnetlink.c:6138 1 lock held by syz-executor.3/29138: #0: ffffffff8e462708 (rtnl_mutex){+.+.}-{3:3}, at: __netlink_dump_start+0x124/0x710 net/netlink/af_netlink.c:2355 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xcd5/0xd20 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 29142 Comm: syz-executor.5 Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:lock_release+0x5d5/0x870 kernel/locking/lockdep.c:5692 Code: 3c 23 00 74 08 4c 89 f7 e8 c8 a9 77 00 f6 84 24 91 00 00 00 02 75 68 41 f7 c5 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 4b c7 44 3c 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc9000476f840 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920008edf1a RCX: ffffc9000476f803 RDX: 0000000000000000 RSI: ffffffff8aeda9e0 RDI: ffffffff8b4975c0 RBP: ffffc9000476f968 R08: dffffc0000000000 R09: fffffbfff1d20096 R10: fffffbfff1d20096 R11: 1ffffffff1d20095 R12: dffffc0000000000 R13: 0000000000000246 R14: ffffc9000476f8d0 R15: 1ffff920008edf14 FS: 00007f3e1fc09700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000201a3030 CR3: 000000003ddc2000 CR4: 00000000003506e0 Call Trace: _copy_from_user+0x26/0x160 lib/usercopy.c:13 copy_from_user include/linux/uaccess.h:161 [inline] copy_msghdr_from_user net/socket.c:2407 [inline] recvmsg_copy_msghdr+0xc1/0x6a0 net/socket.c:2661 ___sys_recvmsg net/socket.c:2733 [inline] do_recvmmsg+0x42d/0xb20 net/socket.c:2831 __sys_recvmmsg net/socket.c:2910 [inline] __do_sys_recvmmsg net/socket.c:2933 [inline] __se_sys_recvmmsg net/socket.c:2926 [inline] __x64_sys_recvmmsg+0x195/0x240 net/socket.c:2926 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f3e1ee8c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e1fc09168 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f3e1efac050 RCX: 00007f3e1ee8c0d9 RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f3e1eee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9a86a85f R14: 00007f3e1fc09300 R15: 0000000000022000