INFO: task kworker/u4:2:40 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2    state:D
 stack:23792 pid:40    ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 synchronize_rcu_expedited+0x6e6/0x890 kernel/rcu/tree_exp.h:977
 synchronize_net net/core/dev.c:10931 [inline]
 unregister_netdevice_many_notify+0x160c/0x1990 net/core/dev.c:11058
 unregister_netdevice_many net/core/dev.c:11077 [inline]
 unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960
 unregister_netdevice include/linux/netdevice.h:3080 [inline]
 nsim_destroy+0x49/0x150 drivers/net/netdevsim/netdev.c:382
 __nsim_dev_port_del+0x155/0x1c0 drivers/net/netdevsim/dev.c:1433
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1445 [inline]
 nsim_dev_reload_destroy+0x283/0x480 drivers/net/netdevsim/dev.c:1663
 nsim_dev_reload_down+0x86/0xb0 drivers/net/netdevsim/dev.c:968
 devlink_reload+0x202/0x690 net/devlink/leftover.c:4485
 devlink_pernet_pre_exit+0x122/0x280 net/devlink/leftover.c:12534
 ops_pre_exit_list net/core/net_namespace.c:162 [inline]
 cleanup_net+0x58e/0xba0 net/core/net_namespace.c:620
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/1:2:126 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D stack:23632 pid:126   ppid:2      flags:0x00004000
Workqueue: events_power_efficient crda_timeout_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 crda_timeout_work+0x11/0x50 net/wireless/reg.c:539
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/1:5:4318 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:5     state:D
 stack:26336 pid:4318  ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 addrconf_dad_work+0xc4/0x1500 net/ipv6/addrconf.c:4146
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task udevd:4334 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:27312 pid:4334  ppid:3640   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 device_lock include/linux/device.h:885 [inline]
 uevent_show+0x16e/0x320 drivers/base/core.c:2669
 dev_attr_show+0x50/0xb0 drivers/base/core.c:2372
 sysfs_kf_seq_show+0x349/0x4b0 fs/sysfs/file.c:59
 seq_read_iter+0x460/0xc50 fs/seq_file.c:230
 call_read_iter include/linux/fs.h:2265 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x471/0x960 fs/read_write.c:470
 ksys_read+0x14d/0x260 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f29e6ea7407
RSP: 002b:00007ffe78a54310 EFLAGS: 00000202
 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f29e7606880 RCX: 00007f29e6ea7407
RDX: 0000000000001000 RSI: 0000562d0cef0550 RDI: 0000000000000008
RBP: 00007f29e6fefff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007f29e6fefea0 R14: 0000000000000000 R15: 0000562d0ceeebd0
 </TASK>
INFO: task syz-executor:4384 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22896 pid:4384  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2144
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x2c2/0x590 kernel/sched/completion.c:138
 devlink_unregister+0xe1/0x540 net/devlink/leftover.c:9782
 nsim_drv_remove+0x4c/0x170 drivers/net/netdevsim/dev.c:1677
 device_remove drivers/base/dd.c:547 [inline]
 __device_release_driver drivers/base/dd.c:1279 [inline]
 device_release_driver_internal+0x47d/0x7c0 drivers/base/dd.c:1305
 bus_remove_device+0x2dd/0x400 drivers/base/bus.c:531
 device_del+0x63f/0xa80 drivers/base/core.c:3900
 device_unregister+0x1c/0xc0 drivers/base/core.c:3943
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
 del_device_store+0x2b2/0x370 drivers/net/netdevsim/bus.c:219
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcef1f5e98e
RSP: 002b:00007ffdc5c2a998 EFLAGS: 00000246
 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555591bd9500 RCX: 00007fcef1f5e98e
RDX: 0000000000000001 RSI: 00007ffdc5c2aa20 RDI: 0000000000000005
RBP: 00007fcef20358ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdc5c2aa20 R14: 00007fcef2d54620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor:4389 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:22880 pid:4389  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f411575e98e
RSP: 002b:00007ffdf1a32528 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055556a8b1500 RCX: 00007f411575e98e
RDX: 0000000000000001 RSI: 00007ffdf1a325b0 RDI: 0000000000000005
RBP: 00007f41158358ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdf1a325b0 R14: 00007f4116554620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor:4394 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22896 pid:4394  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd1ad35e98e
RSP: 002b:00007fff0355e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555566ffd500 RCX: 00007fd1ad35e98e
RDX: 0000000000000001 RSI: 00007fff0355e210 RDI: 0000000000000005
RBP: 00007fd1ad4358ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff0355e210 R14: 00007fd1ae154620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor:4400 blocked for more than 147 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22896 pid:4400  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa4515e98e
RSP: 002b:00007ffdb73762e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055555a5e0500 RCX: 00007ffa4515e98e
RDX: 0000000000000001 RSI: 00007ffdb7376370 RDI: 0000000000000005
RBP: 00007ffa452358ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdb7376370 R14: 00007ffa45f54620 R15: 0000000000000003
 </TASK>
INFO: task khidpd_4c4a4155:4437 blocked for more than 147 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:khidpd_4c4a4155 state:D stack:28592 pid:4437  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2144
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x2c2/0x590 kernel/sched/completion.c:138
 __flush_work+0x938/0xac0 kernel/workqueue.c:3076
 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163
 hidp_session_remove+0xaa/0x2a0 net/bluetooth/hidp/core.c:1199
 l2cap_unregister_user+0x180/0x1a0 net/bluetooth/l2cap_core.c:1786
 hidp_session_thread+0x18d2/0x1960 net/bluetooth/hidp/core.c:1335
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task syz.3.51:4497 blocked for more than 148 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.51        state:D stack:27664 pid:4497  ppid:4390   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
 l2cap_chan_connect+0xfb/0xe20 net/bluetooth/l2cap_core.c:7308
 l2cap_sock_connect+0x576/0x750 net/bluetooth/l2cap_sock.c:257
 __sys_connect_file net/socket.c:2011 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:2028
 __do_sys_connect net/socket.c:2038 [inline]
 __se_sys_connect net/socket.c:2035 [inline]
 __x64_sys_connect+0x76/0x80 net/socket.c:2035
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9a5d39e159
RSP: 002b:00007f9a5e215028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f9a5d625fa0 RCX: 00007f9a5d39e159
RDX: 000000000000000e RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007f9a5d43506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a5d626038 R14: 00007f9a5d625fa0 R15: 00007ffe489d3358
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: 
ffffffff8cb2e230
 (
rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cb2ea50 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
6 locks held by kworker/0:1/14:
1 lock held by khungtaskd/27:
 #0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
3 locks held by kworker/1:1/32:
 #0: ffff888017471938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90000a8fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x82/0xd40 net/wireless/reg.c:2499
6 locks held by kworker/u4:2/40:
 #0: 
ffff88801761e938
 (
(wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90000b17d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8dd49ed0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:594
 #3: ffff88805d34b2f8 (&devlink->lock_key){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x104/0x280 net/devlink/leftover.c:12533
 #4: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x3b/0x150 drivers/net/netdevsim/netdev.c:381
 #5: ffffffff8cb33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #5: ffffffff8cb33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
3 locks held by kworker/1:2/126:
 #0: ffff888017471938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90002e77d00 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: crda_timeout_work+0x11/0x50 net/wireless/reg.c:539
2 locks held by getty/4029:
 #0: ffff88814de18098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
3 locks held by kworker/1:5/4318:
 #0: ffff88802f026938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004317d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1500 net/ipv6/addrconf.c:4146
4 locks held by udevd/4334:
 #0: ffff888028aea418 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x9d/0xc50 fs/seq_file.c:182
 #1: ffff88805ed72888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x59/0x410 fs/kernfs/file.c:172
 #2: ffff88807887d490 (kn->active#5){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff88807887d490 (kn->active#5){.+.+}-{0:0}, at: kernfs_seq_start+0xae/0x410 fs/kernfs/file.c:173
 #3: 
ffff88805bc31a20 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
ffff88805bc31a20 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16e/0x320 drivers/base/core.c:2669
5 locks held by syz-executor/4384:
 #0: 
ffff88806a6c2460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #1: 
ffff88807cefe488
 (
&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #2: ffff888144bb3da0 (kn->active#59){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff888144bb3da0 (kn->active#59){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #3: ffffffff8d66b008 (nsim_bus_dev_list_lock){+.+.}-{3:3}
, at: del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
 #4: 
ffff88805d34a0e8
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:885 [inline]
, at: __device_driver_lock drivers/base/dd.c:1099 [inline]
, at: device_release_driver_internal+0xb1/0x7c0 drivers/base/dd.c:1302
4 locks held by syz-executor/4389:
 #0: 
ffff88806a6c2460
 (
sb_writers
#8){.+.+}-{0:0}, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #1: 
ffff88802ee66488
 (
&of->mutex
){+.+.}-{3:3}
, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #2: 
ffff888144bb3da0
 (
kn->active
#59
){.+.+}-{0:0}
, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #3: 
ffffffff8d66b008
 (
nsim_bus_dev_list_lock
){+.+.}-{3:3}
, at: del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
4 locks held by syz-executor/4394:
 #0: 
ffff88806a6c2460
 (
sb_writers
#8
){.+.+}-{0:0}
, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #1: 
ffff88802fda7488
 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #2: 
ffff888144bb3da0
 (
kn->active
#59
){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #3: 
ffffffff8d66b008 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
4 locks held by syz-executor/4400:
 #0: 
ffff88806a6c2460
 (
sb_writers#8
){.+.+}-{0:0}
, at: vfs_write+0x270/0x9a0 fs/read_write.c:580
 #1: ffff88807e794888 (&of->mutex){+.+.}-{3:3}
, at: kernfs_fop_write_iter+0x1d8/0x520 fs/kernfs/file.c:343
 #2: ffff888144bb3da0 (kn->active#59){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff888144bb3da0 (kn->active#59){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x520 fs/kernfs/file.c:344
 #3: ffffffff8d66b008 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd3/0x370 drivers/net/netdevsim/bus.c:209
2 locks held by khidpd_4c4a4155/4437:
 #0: ffff88807aa50428
 (
&hdev->lock
){+.+.}-{3:3}, at: l2cap_unregister_user+0x67/0x1a0 net/bluetooth/l2cap_core.c:1780
 #1: ffffffff8dee0db0 (hidp_session_sem){++++}-{3:3}, at: hidp_session_remove+0x28/0x2a0 net/bluetooth/hidp/core.c:1186
1 lock held by syz.3.51/4497:
 #0: ffff88807aa50428 (&hdev->lock){+.+.}-{3:3}, at: l2cap_chan_connect+0xfb/0xe20 net/bluetooth/l2cap_core.c:7308
1 lock held by syz-executor/4500:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
2 locks held by dhcpcd/4502:
 #0: ffff888076858130 (sk_lock-AF_PACKET){+.+.}-{0:0}
, at: lock_sock include/net/sock.h:1805 [inline]
, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
 #1: 
ffffffff8cb33578
 (rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
, at: synchronize_rcu_expedited+0x3c0/0x890 kernel/rcu/tree_exp.h:962
1 lock held by dhcpcd/4503:
 #0: ffff888023c7e130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
 #0: ffff888023c7e130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
1 lock held by dhcpcd/4504:
 #0: ffff88801f33a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
 #0: ffff88801f33a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
1 lock held by dhcpcd/4505:
 #0: ffff88814005a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
 #0: ffff88814005a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
1 lock held by dhcpcd/4506:
 #0: 
ffff888023e90130
 (
sk_lock-AF_PACKET
){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
1 lock held by dhcpcd/4507:
 #0: 
ffff888024f2a130
 (
sk_lock-AF_PACKET
){+.+.}-{0:0}
, at: lock_sock include/net/sock.h:1805 [inline]
, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3285
1 lock held by syz-executor/4512:
 #0: 
ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4513:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4514:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4515:
 #0: 
ffffffff8dd56d68
 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4522:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4527:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4530:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4531:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4534:
 #0: 
ffffffff8dd56d68
 (
rtnl_mutex
){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
1 lock held by syz-executor/4537:
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 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+0xf0e/0xf50 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events hidp_session_dev_work
RIP: 0010:put_dec_trunc8+0x12b/0x340 lib/vsprintf.c:238
Code: f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 99 01 00 00 45 0f b7 36 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 9e 01 00 00 <66> 44 89 73 02 4c 8d 73 04 bf 40 42 0f 00 89 ee e8 70 09 5d f7 81
RSP: 0018:ffffc90000136ac8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000136b80 RCX: ffff88813fec1e00
RDX: 0000000000000000 RSI: 0000000000000062 RDI: 0000000000000064
RBP: 000000000007ee89 R08: ffffc90000136b97 R09: ffffc90000136b80
R10: dffffc0000000000 R11: fffff52000026d73 R12: dffffc0000000000
R13: 0000000000000033 R14: 0000000000003938 R15: ffffc90000136b82
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8879d55000 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 number+0x321/0xef0 lib/vsprintf.c:508
 vsnprintf+0x12d3/0x1c20 lib/vsprintf.c:2871
 sprintf+0xe4/0x140 lib/vsprintf.c:3009
 print_time kernel/printk/printk.c:1274 [inline]
 info_print_prefix+0x168/0x360 kernel/printk/printk.c:1300
 record_print_text+0x17e/0x4a0 kernel/printk/printk.c:1349
 console_emit_next_record+0x5a4/0xb50 kernel/printk/printk.c:2760
 console_flush_all kernel/printk/printk.c:-1 [inline]
 console_unlock+0x223/0x630 kernel/printk/printk.c:2906
 vprintk_emit+0x4b3/0x6a0 kernel/printk/printk.c:2303
 dev_vprintk_emit+0x32c/0x3de drivers/base/core.c:4948
 dev_printk_emit+0xeb/0x139 drivers/base/core.c:4959
 _dev_warn+0x11b/0x16c drivers/base/core.c:5015
 hid_parser_main+0x7d3/0xb80 drivers/hid/hid-core.c:643
 hid_open_report+0x84c/0xed0 drivers/hid/hid-core.c:1287
 hid_parse include/linux/hid.h:1135 [inline]
 hid_generic_probe+0x39/0x80 drivers/hid/hid-generic.c:63
 __hid_device_probe drivers/hid/hid-core.c:2678 [inline]
 hid_device_probe+0x2b8/0x520 drivers/hid/hid-core.c:2717
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834
 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034
 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
 device_add+0xbcf/0x1050 drivers/base/core.c:3712
 hid_add_device+0x361/0x500 drivers/hid/hid-core.c:2863
 hidp_session_dev_add net/bluetooth/hidp/core.c:876 [inline]
 hidp_session_dev_work+0x41/0x150 net/bluetooth/hidp/core.c:915
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>