INFO: task kworker/u8:3:42 blocked for more than 147 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:0     pid:42    tgid:42    ppid:2      task_flags:0x4208060 flags:0x00000010
Workqueue: events_power_efficient reg_check_chans_work
Call trace:
 __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T)
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x13b0/0x2864 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:7026
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7083
 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:676
 __mutex_lock kernel/locking/mutex.c:760 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
 class_wiphy_constructor include/net/cfg80211.h:6358 [inline]
 reg_leave_invalid_chans net/wireless/reg.c:2441 [inline]
 reg_check_chans_work+0x12c/0xdc8 net/wireless/reg.c:2456
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3427
 kthread+0x5fc/0x75c kernel/kthread.c:463
 r
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
2 locks held by kworker/u8:1/14:
1 lock held by khungtaskd/32:
 #0: ffff80008f76b6a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
3 locks held by kworker/u8:2/41:
4 locks held by kworker/u8:3/42:
 #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237
 #1: ffff8000990c7be0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237
 #2: ffff8000928577e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
 #3: ffff0000d2b80788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6358 [inline]
 #3: ffff0000d2b80788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2441 [inline]
 #3: ffff0000d2b80788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x12c/0xdc8 net/wireless/reg.c:2456
2 locks held by pr/ttyAMA-1/43:
3 locks held by kworker/R-ipv6_/4232:
 #0: ffff0000d2d01148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237
 #1: ffff8000a1c17bc0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237
 #2: ffff8000928577e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
3 locks held by kworker/u8:6/5262:
1 lock held by klogd/6179:
4 locks held by udevd/6190:
1 lock held by dhcpcd/6244:
3 locks held by dhcpcd/6245:
2 locks held by getty/6335:
 #0: ffff0000d345d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009bb2e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/6538:
4 locks held by udevd/6542:
1 lock held by syz-executor/6549:
1 lock held by syz-executor/6550:
1 lock held by syz-executor/6551:
2 locks held by syz-executor/6555:
3 locks held by kworker/1:5/6657:
 #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237
 #1: ffff80009e187be0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237
 #2: ffff8000928577e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
1 lock held by syz.0.1709/10583:
 #0: ffff8000928577e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
2 locks held by kworker/u8:8/16530:
3 locks held by kworker/u8:11/17211:
2 locks held by kworker/0:8/17214:
3 locks held by kworker/u8:14/17217:
2 locks held by syz-executor/17218:
3 locks held by kworker/u8:15/17219:
3 locks held by kworker/u8:16/17220:

=============================================