INFO: task kworker/0:2:895 blocked for more than 430 seconds. Not tainted 5.15.0-rc1-syzkaller-00001-g64a19591a293 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack: 0 pid: 895 ppid: 2 flags:0x00000000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: [] context_switch kernel/sched/core.c:4940 [inline] [] __schedule+0x506/0x1048 kernel/sched/core.c:6287 [] schedule+0x66/0x168 kernel/sched/core.c:6366 [] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:6425 [] __mutex_lock_common kernel/locking/mutex.c:669 [inline] [] __mutex_lock+0x310/0xa60 kernel/locking/mutex.c:729 [] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:743 [] rtnl_lock+0x22/0x2a net/core/rtnetlink.c:72 [] addrconf_verify_work+0x18/0x2c net/ipv6/addrconf.c:4590 [] process_one_work+0x5e4/0xf5c kernel/workqueue.c:2297 [] worker_thread+0x356/0x8e6 kernel/workqueue.c:2444 [] kthread+0x25c/0x2c6 kernel/kthread.c:319 [] ret_from_exception+0x0/0x14 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff83d2b3e8 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x32/0x1fa kernel/locking/lockdep.c:6448 3 locks held by kworker/0:2/895: #0: ffffffe00d4a1d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:633 [inline] #0: ffffffe00d4a1d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffffffe00d4a1d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x4b6/0xf5c kernel/workqueue.c:2268 #1: ffffffe00bb43d40 ((addr_chk_work).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:633 [inline] #1: ffffffe00bb43d40 ((addr_chk_work).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #1: ffffffe00bb43d40 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x4b6/0xf5c kernel/workqueue.c:2268 #2: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:72 1 lock held by klogd/1789: 1 lock held by dhcpcd/1833: #0: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x294/0x90e net/core/rtnetlink.c:5569 2 locks held by getty/1953: #0: ffffffe00da8d098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x48 drivers/tty/tty_ldsem.c:340 #1: ffffffd0107f52e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9a0/0xafa drivers/tty/n_tty.c:2113 3 locks held by kworker/0:3/2338: #0: ffffffe005618d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:633 [inline] #0: ffffffe005618d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffffffe005618d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x4b6/0xf5c kernel/workqueue.c:2268 #1: ffffffe0216d3d40 ((linkwatch_work).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:633 [inline] #1: ffffffe0216d3d40 ((linkwatch_work).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #1: ffffffe0216d3d40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x4b6/0xf5c kernel/workqueue.c:2268 #2: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:72 2 locks held by syz-executor.0/3292: #0: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff83e8c178 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x294/0x90e net/core/rtnetlink.c:5569 #1: ffffffff83d2be68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff83d2be68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x33a/0x3f4 kernel/rcu/tree_exp.h:837 2 locks held by kworker/1:0/3314: =============================================