INFO: task kworker/u8:5:363 blocked for more than 122 seconds.
      Not tainted 6.16.0-rc3-syzkaller-00233-g35e261cd95dd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5    state:D stack:0     pid:363   tgid:363   ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6878
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6935
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x78f/0x12a0 kernel/locking/mutex.c:747
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1035
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:278
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:80
 rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 addrconf_dad_work+0x10a/0x14a0 net/ipv6/addrconf.c:4198
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d2/0x1040 kernel/workqueue.c:3321
 worker_thread+0xc4e/0x1270 kernel/workqueue.c:3402
 kthread+0x6f7/0x880 kernel/kthread.c:464
 ret_from_fork+0x147/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task kworker/u8:5:363 is blocked on a mutex likely owned by task kworker/u8:0:12.
task:kworker/u8:0    state:R  running task     stack:0     pid:12    tgid:12    ppid:2      task_flags:0x4208060 flags:0x00004008
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6785
 preempt_schedule_common+0x2d/0x60 kernel/sched/core.c:6965
 preempt_schedule+0xae/0xd0 kernel/sched/core.c:6989
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 </TASK>
INFO: task kworker/u8:6:557 blocked for more than 125 seconds.
      Not tainted 6.16.0-rc3-syzkaller-00233-g35e261cd95dd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6    state:D stack:0     pid:557   tgid:557   ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6878
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6935
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x78f/0x12a0 kernel/locking/mutex.c:747
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1035
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:278
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:80
 linkwatch_event+0x12/0x60 net/core/link_watch.c:303
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d2/0x1040 kernel/workqueue.c:3321
 worker_thread+0xc4e/0x1270 kernel/workqueue.c:3402
 kthread+0x6f7/0x880 kernel/kthread.c:464
 ret_from_fork+0x147/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task kworker/u8:6:557 is blocked on a mutex likely owned by task kworker/u8:0:12.
task:kworker/u8:0    state:R  running task     stack:0     pid:12    tgid:12    ppid:2      task_flags:0x4208060 flags:0x00004008
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6785
 preempt_schedule_common+0x2d/0x60 kernel/sched/core.c:6965
 preempt_schedule+0xae/0xd0 kernel/sched/core.c:6989
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __local_bh_enable_ip+0x64/0x80 kernel/softirq.c:414
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 addrconf_ifdown+0x607/0x1940 net/ipv6/addrconf.c:3911
 addrconf_notify+0x17a/0xea0 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x10b/0x2c0 kernel/notifier.c:85
 raw_notifier_call_chain+0x31/0x40 kernel/notifier.c:453
 call_netdevice_notifiers_info net/core/dev.c:2230 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
 call_netdevice_notifiers net/core/dev.c:2282 [inline]
 unregister_netdevice_many_notify+0x1558/0x2350 net/core/dev.c:12077
 unregister_netdevice_many net/core/dev.c:12140 [inline]
 default_device_exit_batch+0x80d/0x890 net/core/dev.c:12644
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x4e2/0x730 net/core/net_namespace.c:253
 cleanup_net+0x484/0x7c0 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d2/0x1040 kernel/workqueue.c:3321
 worker_thread+0xc4e/0x1270 kernel/workqueue.c:3402
 kthread+0x6f7/0x880 kernel/kthread.c:464
 ret_from_fork+0x147/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task syz-executor:563 blocked for more than 130 seconds.
      Not tainted 6.16.0-rc3-syzkaller-00233-g35e261cd95dd #0