INFO: task kworker/0:2:5221 blocked for more than 143 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:22136 pid:5221 tgid:5221 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4144 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa01/0x1770 kernel/workqueue.c:3335 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 INFO: task kworker/1:6:8245 blocked for more than 143 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:6 state:D stack:23280 pid:8245 tgid:8245 ppid:2 flags:0x00004000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa01/0x1770 kernel/workqueue.c:3335 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 INFO: task syz-executor.2:25600 blocked for more than 143 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:20592 pid:25600 tgid:25600 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 tun_detach drivers/net/tun.c:698 [inline] tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3506 __fput+0x42b/0x8a0 fs/file_table.c:423 task_work_run+0x250/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1a/0x27d0 kernel/exit.c:878 do_group_exit+0x206/0x2c0 kernel/exit.c:1027 get_signal+0x176d/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x360 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f67f727fa9c RSP: 002b:00007ffec586b030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: 0000000000000040 RBX: 00007f67f7ed4620 RCX: 00007f67f727fa9c RDX: 0000000000000040 RSI: 00007f67f7ed4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffec586b084 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f67f7ed4670 R15: 0000000000000000 INFO: task syz-executor.5:25666 blocked for more than 144 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:20848 pid:25666 tgid:25666 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f6c3dc7fa9c RSP: 002b:00007ffd189b9e30 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6c3e8d4620 RCX: 00007f6c3dc7fa9c RDX: 0000000000000028 RSI: 00007f6c3e8d4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd189b9e84 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f6c3e8d4670 R15: 0000000000000000 INFO: task syz-executor.4:26030 blocked for more than 144 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:20720 pid:26030 tgid:26030 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f8e4987fa9c RSP: 002b:00007ffd8d4c7ff0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8e4a4d4620 RCX: 00007f8e4987fa9c RDX: 0000000000000028 RSI: 00007f8e4a4d4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd8d4c8044 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f8e4a4d4670 R15: 0000000000000000 INFO: task kworker/0:0:26436 blocked for more than 145 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:25720 pid:26436 tgid:26436 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 linkwatch_event+0xe/0x60 net/core/link_watch.c:281 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa01/0x1770 kernel/workqueue.c:3335 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 INFO: task kworker/1:0:26489 blocked for more than 145 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23896 pid:26489 tgid:26489 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4144 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa01/0x1770 kernel/workqueue.c:3335 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 INFO: task syz-executor.1:26542 blocked for more than 145 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26288 pid:26542 tgid:26539 ppid:5099 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f493227fa9c RSP: 002b:00007f49330d7f60 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f49330d8050 RCX: 00007f493227fa9c RDX: 0000000000000024 RSI: 00007f49330d80a0 RDI: 0000000000000007 RBP: 0000000000000000 R08: 00007f49330d7fb4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000007 R13: 00007f49330d8008 R14: 00007f49330d80a0 R15: 0000000000000000 INFO: task syz-executor.1:26545 blocked for more than 146 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26768 pid:26545 tgid:26539 ppid:5099 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f493227dda9 RSP: 002b:00007f49330b80c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f49323ac050 RCX: 00007f493227dda9 RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000006 RBP: 00007f49322ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f49323ac050 R15: 00007ffcfaad4138 INFO: task syz-executor.1:26546 blocked for more than 146 seconds. Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26768 pid:26546 tgid:26539 ppid:5099 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6738 __schedule_loop kernel/sched/core.c:6815 [inline] schedule+0x14a/0x320 kernel/sched/core.c:6830 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6887 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f493227dda9 RSP: 002b:00007f49330970c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f49323ac120 RCX: 00007f493227dda9 RDX: 0000000000000000 RSI: 0000000020005840 RDI: 0000000000000005 RBP: 00007f49322ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f49323ac120 R15: 00007ffcfaad4138 Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e131020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e131020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e131020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4821: #0: ffff88802a7240a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 2 locks held by kworker/u8:2/18112: 5 locks held by kworker/u8:11/18113: #0: ffff888015ac5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888015ac5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8df/0x1770 kernel/workqueue.c:3335 #1: ffffc90016a7fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90016a7fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x91a/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f36b110 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf5/0xb90 net/core/net_namespace.c:580 #3: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe8/0x9d0 net/core/dev.c:11612 #4: ffffffff8e1363b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #4: ffffffff8e1363b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x39a/0x820 kernel/rcu/tree_exp.h:939 3 locks held by kworker/0:2/5221: #0: ffff888029c89948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888029c89948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8df/0x1770 kernel/workqueue.c:3335 #1: ffffc900185efd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900185efd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91a/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4144 3 locks held by kworker/1:6/8245: #0: ffff888014c74948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888014c74948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8df/0x1770 kernel/workqueue.c:3335 #1: ffffc900170e7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900170e7d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x91a/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by syz-executor.2/25600: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3506 1 lock held by syz-executor.5/25666: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.4/26030: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 3 locks held by kworker/0:0/26436: #0: ffff888014c74948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888014c74948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8df/0x1770 kernel/workqueue.c:3335 #1: ffffc9000fc77d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc9000fc77d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x91a/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:281 3 locks held by kworker/1:0/26489: #0: ffff888029c89948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888029c89948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8df/0x1770 kernel/workqueue.c:3335 #1: ffffc9000fdf7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc9000fdf7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91a/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4144 1 lock held by syz-executor.1/26542: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.1/26545: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.1/26546: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.1/26554: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 2 locks held by kworker/u8:24/26578: 2 locks held by syz-executor.0/26635: #0: ffffffff8f35cbe8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x664/0x8e0 net/socket.c:1303 #1: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: vlan_ioctl_handler+0x112/0x9d0 net/8021q/vlan.c:553 2 locks held by syz-executor.3/26663: #0: ffffffff8f35cb28 (br_ioctl_mutex){+.+.}-{3:3}, at: br_ioctl_call net/socket.c:1193 [inline] #0: ffffffff8f35cb28 (br_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x5c6/0x8e0 net/socket.c:1295 #1: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: br_ioctl_stub+0xa4/0xb00 net/bridge/br_ioctl.c:402 1 lock held by syz-executor.2/26666: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.5/26669: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.4/26674: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.1/26675: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.0/26687: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.3/26692: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.2/26698: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.5/26703: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.4/26706: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.1/26709: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.0/26712: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 1 lock held by syz-executor.3/26717: #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f377688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6614 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 18297 Comm: kworker/u8:14 Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: bat_events batadv_mcast_mla_update RIP: 0010:look_up_lock_class+0x2/0x160 kernel/locking/lockdep.c:883 Code: 41 f7 c4 00 02 00 00 75 af eb ae e8 98 fa ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 53 48 83 ec 10 89 f3 65 48 8b 04 25 28 00 00 00 48 89 44 24 RSP: 0018:ffffc90017467870 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffffff9448e403 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90017467d00 RBP: ffffc90017467960 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f0b0ae R12: ffffc90017467d00 R13: ffffc90017467d00 R14: 0000000000000000 R15: 1ffff92002e8cf18 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c004f65a58 CR3: 000000000df32000 CR4: 0000000000350ef0 Call Trace: register_lock_class+0x102/0x980 kernel/locking/lockdep.c:1284 __lock_acquire+0xd9/0x1fd0 kernel/locking/lockdep.c:5014 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 process_one_work kernel/workqueue.c:3230 [inline] process_scheduled_works+0x938/0x1770 kernel/workqueue.c:3335 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243