INFO: task kworker/u8:0:12 blocked for more than 145 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:0 pid:12 tgid:12 ppid:2 task_flags:0x4208160 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 Showing all locks held in the system: 3 locks held by kworker/0:0/9: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80008e9d7be0 (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/0:1/10: 4 locks held by kworker/u8:0/12: #0: ffff0000c004b940 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80008ea07be0 ((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: ffff0000d4d60780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6645 [inline] #3: ffff0000d4d60780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2454 [inline] #3: ffff0000d4d60780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x14c/0x112c net/wireless/reg.c:2469 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 3 locks held by kworker/u8:2/39: 1 lock held by pr/ttyAMA-1/41: 3 locks held by kworker/u8:8/3465: #0: ffff0000ce785940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff80009b077be0 ((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 2 locks held by kworker/u8:9/3854: 1 lock held by klogd/4291: 2 locks held by udevd/4302: 1 lock held by crond/4433: 2 locks held by getty/4450: #0: ffff0000cef450a0 (&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 4 locks held by kworker/1:4/4779: 2 locks held by syz-executor/5059: 3 locks held by kworker/u8:10/5197: 3 locks held by kworker/u8:12/5199: 3 locks held by kworker/u8:13/5200: 3 locks held by kworker/u8:14/5203: 3 locks held by kworker/u8:15/5204: 3 locks held by kworker/u8:18/5207: 3 locks held by kworker/u8:20/5209: 3 locks held by kworker/u8:21/5210: 3 locks held by kworker/u8:22/5211: 3 locks held by kworker/u8:23/5212: 2 locks held by kworker/u8:24/5213: 3 locks held by kworker/u8:26/5219: 3 locks held by kworker/u8:27/5220: 3 locks held by kworker/u8:28/5221: 4 locks held by kworker/u8:30/5223: #0: ffff0000c004e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x640/0x173c kernel/workqueue.c:3276 #1: ffff800098347be0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x173c kernel/workqueue.c:3276 #2: ffff800089b78428 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x100/0x6b8 net/core/net_namespace.c:673 #3: ffff800089b85900 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:33/5226: 2 locks held by kworker/u8:34/5227: 2 locks held by syz.0.151/5774: #0: ffff0000cab00ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x2c/0xb8 net/bluetooth/hci_core.c:500 #1: ffff0000cab000b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x424/0xd88 net/bluetooth/hci_sync.c:5356 2 locks held by udevd/5924: 1 lock held by syz-executor/6810: 3 locks held by kworker/u8:35/7164: 3 locks held by kworker/u8:36/7167: 6 locks held by kworker/u8:37/7168: 1 lock held by syz-executor/8261: #0: ffff0000ce7e02e0 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_table_lock+0x64/0x3c0 net/netfilter/x_tables.c:1270 3 locks held by dhcpcd-run-hook/8786: 3 locks held by syz-executor/8805: 1 lock held by syz-executor/8806: =============================================