INFO: task kworker/u8:3:40 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:3 state:D stack:0 pid:40 tgid:40 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events_power_efficient reg_check_chans_work Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5387 [inline] __schedule+0x1b74/0x2d24 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0xa4/0x140 kernel/sched/core.c:7282 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7339 __mutex_lock_common+0x98c/0x20f4 kernel/locking/mutex.c:726 __mutex_lock kernel/locking/mutex.c:820 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:873 class_wiphy_constructor include/net/cfg80211.h:6645 [inline] reg_leave_invalid_chans net/wireless/reg.c:2454 [inline] reg_check_chans_work+0x14c/0x112c net/wireless/reg.c:2469 process_one_work+0x78c/0x173c kernel/workqueue.c:3302 process_scheduled_works+0xdc/0x13c kernel/workqueue.c:3385 worker_thread+0x770/0xbd0 kernel/workqueue.c:3466 kthread+0x2f0/0x3c0 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 INFO: task kworker/u8:21:5351 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:21 state:D stack:0 pid:5351 tgid:5351 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: ipv6_addrconf addrconf_verify_work Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5387 [inline] __schedule+0x1b74/0x2d24 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0xa4/0x140 kernel/sched/core.c:7282 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7339 __mutex_lock_common+0x98c/0x20f4 kernel/locking/mutex.c:726 __mutex_lock kernel/locking/mutex.c:820 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:873 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_verify_work+0x20/0x3c net/ipv6/addrconf.c:4746 process_one_work+0x78c/0x173c kernel/workqueue.c:3302 process_scheduled_works+0xdc/0x13c kernel/workqueue.c:3385 worker_thread+0x770/0xbd0 kernel/workqueue.c:3466 kthread+0x2f0/0x3c0 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Showing all locks held in the system: 2 locks held by kworker/0:1/10: 3 locks held by kworker/u8:0/12: 2 locks held by kworker/u8:1/14: 2 locks held by kworker/1:0/24: 2 locks held by kworker/1:1/26: 1 lock held by khungtaskd/31: #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] #0: ffff800088ac66e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3869 1 lock held by khugepaged/36: 4 locks held by kworker/u8:3/40: #0: ffff0000c004b940 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80008efe7be0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x173c kernel/workqueue.c:3276 #2: ffff800089b85900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000f32d0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6645 [inline] #3: ffff0000f32d0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2454 [inline] #3: ffff0000f32d0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x14c/0x112c net/wireless/reg.c:2469 3 locks held by pr/ttyAMA-1/41: 3 locks held by kworker/u8:4/1104: 3 locks held by kworker/u8:6/1310: 2 locks held by kworker/u8:7/3266: 3 locks held by kworker/u8:8/3440: 2 locks held by kworker/u8:9/3582: 3 locks held by kworker/u8:10/3650: 2 locks held by kworker/u8:11/3694: 2 locks held by kworker/u8:12/3862: 1 lock held by klogd/4294: 3 locks held by udevd/4305: 2 locks held by dhcpcd/4360: 3 locks held by dhcpcd/4361: 1 lock held by crond/4436: 2 locks held by getty/4455: #0: ffff0000cf49c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009228b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x354/0xf84 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/4672: 1 lock held by syz-executor/4673: #0: ffff800088acbce8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #0: ffff800088acbce8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x34c/0x67c kernel/rcu/tree_exp.h:961 2 locks held by syz-executor/4675: 3 locks held by kworker/1:3/4683: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80009c717be0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x173c kernel/workqueue.c:3276 #2: ffff800089b85900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 4 locks held by kworker/1:5/4762: 2 locks held by kworker/1:6/4769: 4 locks held by kworker/u8:13/5176: 3 locks held by kworker/u8:17/5346: 2 locks held by kworker/u8:19/5349: 3 locks held by kworker/u8:21/5351: #0: ffff0000ce9ac940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80009d857be0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x173c kernel/workqueue.c:3276 #2: ffff800089b85900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz.0.250/5721: #0: ffff800089b85900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:22/8200: 2 locks held by syz-executor/8201: =============================================