INFO: task kworker/u4:0:20038 blocked for more than 143 seconds.
      Not tainted 6.1.0-syzkaller-13031-g77856d911a8c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D stack:23672 pid:20038 ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x9d1/0xe40 kernel/sched/core.c:6555
 schedule+0xcb/0x190 kernel/sched/core.c:6631
 rxrpc_destroy_all_calls+0x585/0x680 net/rxrpc/call_object.c:733
 rxrpc_exit_net+0x6a/0xc0 net/rxrpc/net_ns.c:125
 ops_exit_list net/core/net_namespace.c:169 [inline]
 cleanup_net+0x758/0xc60 net/core/net_namespace.c:606
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d3238d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d3240d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: ffffffff8d323700 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4734:
 #0: ffff88802cd31098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177
3 locks held by kworker/u4:25/16565:
3 locks held by kworker/u4:0/20038:
 #0: ffff8880129cb138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: ffffc9000387fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: ffffffff8e456410 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:568
1 lock held by syz-executor.1/866:
 #0: ffff88801dcfa458 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff88801dcfa458 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x2e2/0xcb0 arch/x86/mm/fault.c:1369

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-syzkaller-13031-g77856d911a8c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:377
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 31652 Comm: kworker/u4:8 Not tainted 6.1.0-syzkaller-13031-g77856d911a8c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: phy30 ieee80211_iface_work
RIP: 0010:debug_object_activate+0xef/0x6e0 lib/debugobjects.c:667
Code: c6 48 85 db 74 45 48 8d 6b 18 49 89 ec 49 c1 ec 03 43 80 3c 2c 00 74 08 48 89 ef e8 1b 26 9c fd 4c 39 7d 00 0f 84 ad 00 00 00 <48> 89 d8 48 c1 e8 03 42 80 3c 28 00 74 c3 48 89 df e8 fb 25 9c fd
RSP: 0018:ffffc9000471f0e8 EFLAGS: 00000083
RAX: 1ffff11015b0b0fc RBX: ffff888080606070 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc9000471efc0
RBP: ffff888080606088 R08: dffffc0000000000 R09: fffff520008e3df8
R10: fffff520008e3df9 R11: 1ffff920008e3df8 R12: 1ffff110100c0c11
R13: dffffc0000000000 R14: 000000000000000a R15: ffff8880450d6e80
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3074ad56be CR3: 000000000d08e000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 debug_rcu_head_queue kernel/rcu/rcu.h:189 [inline]
 kvfree_call_rcu+0xb4/0x8c0 kernel/rcu/tree.c:3365
 cfg80211_update_known_bss+0x16a/0x9e0
 cfg80211_bss_update+0x175/0x20b0 net/wireless/scan.c:1728
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2492 [inline]
 cfg80211_inform_bss_frame_data+0xc42/0x21e0 net/wireless/scan.c:2525
 ieee80211_bss_info_update+0x74f/0x1030 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x19a8/0x2d00 net/mac80211/ibss.c:1638
 ieee80211_iface_process_skb net/mac80211/iface.c:1581 [inline]
 ieee80211_iface_work+0x773/0xcf0 net/mac80211/iface.c:1635
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>