INFO: task kworker/1:0:23 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D
 stack:22520 pid:23    tgid:23    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x132a/0x3b00 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0x524/0x1310 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d6/0x200 kernel/locking/rwsem.c:1578
 kernfs_add_one+0x38/0x840 fs/kernfs/dir.c:791
 kernfs_create_dir_ns+0xfc/0x1a0 fs/kernfs/dir.c:1091
 sysfs_create_dir_ns+0x13a/0x2b0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x2c4/0x9b0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x16e/0x240 lib/kobject.c:426
 device_add+0x288/0x1a70 drivers/base/core.c:3604
 usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5535 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task udevd:6232 blocked for more than 144 seconds.
      Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D
 stack:27064 pid:6232  tgid:6232  ppid:2841   task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x132a/0x3b00 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
 device_lock include/linux/device.h:922 [inline]
 uevent_show+0x187/0x3b0 drivers/base/core.c:2730
 dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
 sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
 seq_read_iter+0x506/0x12b0 fs/seq_file.c:230
 kernfs_fop_read_iter+0x422/0x5a0 fs/kernfs/file.c:279
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x8c8/0xc70 fs/read_write.c:570
 ksys_read+0x12a/0x240 fs/read_write.c:713
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa678fffb6a
RSP: 002b:00007ffca5ed2118 EFLAGS: 00000246
 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000556eefc3b920 RCX: 00007fa678fffb6a
RDX: 0000000000001000 RSI: 0000556eefc69f80 RDI: 0000000000000008
RBP: 0000556eefc3b920 R08: 0000000000000008 R09: 0000000000000004
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffca5ed25f8 R15: 000000000000000a
 </TASK>
INFO: task udevd:6232 is blocked on a mutex likely owned by task kworker/0:1:10.
task:kworker/0:1     state:D stack:20952 pid:10    tgid:10    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x132a/0x3b00 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0x524/0x1310 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d6/0x200 kernel/locking/rwsem.c:1578
 kernfs_add_one+0x38/0x840 fs/kernfs/dir.c:791
 kernfs_create_dir_ns+0xfc/0x1a0 fs/kernfs/dir.c:1091
 sysfs_create_dir_ns+0x13a/0x2b0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x2c4/0x9b0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x16e/0x240 lib/kobject.c:426
 class_dir_create_and_add drivers/base/core.c:3209 [inline]
 get_device_parent+0x399/0x4e0 drivers/base/core.c:3260
 device_add+0x1ad/0x1a70 drivers/base/core.c:3590
 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4348
 device_create+0xed/0x130 drivers/base/core.c:4387
 usb_register_dev+0x2f0/0x560 drivers/usb/core/file.c:150
 imon_init_display drivers/media/rc/imon.c:2390 [inline]
 imon_probe+0x1ee4/0x3ac0 drivers/media/rc/imon.c:2474
 usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x23e/0xa90 drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
 bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1a70 drivers/base/core.c:3666
 usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
 usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x23e/0xa90 drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
 bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1a70 drivers/base/core.c:3666
 usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5535 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:0/9:
 #0: ffff888100080d48 ((wq_completion)events){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: 
ffffc9000009fd18 (
kernfs_notify_work){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: 
ffff888100ac4a78 (
&root->kernfs_supers_rwsem){++++}-{4:4}
, at: kernfs_notify_workfn+0xf7/0xb20 fs/kernfs/file.c:913
 #3: 
ffff888100ac4948
 (&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_notify_workfn+0xff/0xb20 fs/kernfs/file.c:914
8 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
 #0: ffffffff890c1a00
 (rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
5 locks held by kworker/u8:2/37:
 #0: ffff888100ac3948
 (
(wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90000277d18
 (net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: 
ffffffff8a39f090
 (pernet_ops_rwsem
){++++}-{4:4}
, at: cleanup_net+0xc9/0xb30 net/core/net_namespace.c:608
 #3: ffffffff8a3b4e68
 (
rtnl_mutex
){+.+.}-{4:4}
, at: cleanup_net+0x50d/0xb30 net/core/net_namespace.c:644
 #4: ffffffff89788b28
 (gdp_mutex
){+.+.}-{4:4}
, at: cleanup_glue_dir drivers/base/core.c:3340 [inline]
, at: cleanup_glue_dir+0xca/0x250 drivers/base/core.c:3332
2 locks held by getty/2899:
 #0: ffff8881092d50a0
 (&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: 
ffffc900000432f0
 (&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
9 locks held by syz-executor/2942:
1 lock held by syz-executor/2950:
 #0: ffff888100ac4948
 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1160
6 locks held by kworker/0:4/5250:
4 locks held by udevd/6232:
 #0: 
ffff88811e4842f0
 (
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12b0 fs/seq_file.c:182
 #1: 
ffff88812137b088
 (
&of->mutex
#2){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: 
ffff88811e5b6968
 (
kn->active
#5
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff888106aeb198 (
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: uevent_show+0x187/0x3b0 drivers/base/core.c:2730
1 lock held by syz-executor/6443:
 #0: 
ffff888100ac4948 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1178
1 lock held by syz-executor/6444:
 #0: 
ffff888100ac4948 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1178
1 lock held by syz-executor/6445:
 #0: 
ffff888100ac4948
 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1178
1 lock held by syz-executor/6446:
 #0: ffff888100ac4948
 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1178
1 lock held by syz-executor/6447:
 #0: 
ffff888100ac4948
 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1178

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0x11c4/0x15d0 kernel/hung_task.c:437
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2942 Comm: syz-executor Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:416
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 cc cc cc cc e8 81 9e 09 ff eb a0 e8 0a 9f 09
RSP: 0018:ffffc90000007500 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82ce5ab5 RDI: ffffffff938b6820
RBP: ffffffff938b67e0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff938b67e0 R15: ffffffff82ce5a50
FS:  0000000000000000(0000) GS:ffff8882691d3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d0393 CR3: 000000012361c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 serial_port_out include/linux/serial_core.h:796 [inline]
 serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3306 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3378 [inline]
 serial8250_console_write+0xfbc/0x1890 drivers/tty/serial/8250/8250_port.c:3456
 console_emit_next_record kernel/printk/printk.c:3138 [inline]
 console_flush_all+0x7fe/0xc60 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
 dev_vprintk_emit drivers/base/core.c:4891 [inline]
 dev_printk_emit+0xfa/0x140 drivers/base/core.c:4902
 __dev_printk+0xf5/0x270 drivers/base/core.c:4914
 _dev_warn+0xe4/0x120 drivers/base/core.c:4958
 usb_rx_callback_intf0+0x11c/0x1a0 drivers/media/rc/imon.c:1768
 __usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x180e/0x3a20 drivers/usb/gadget/udc/dummy_hcd.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
 handle_softirqs+0x205/0x8d0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5891
Code: 0f c1 05 68 a5 0b 0b 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 bd 69 0b 0b 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41
RSP: 0018:ffffc900017bf598 EFLAGS: 00000206
RAX: d384ae5b0d9a8e00 RBX: ffffffff890c1a00 RCX: ffffc900017bf5a4
RDX: 0000000000000003 RSI: ffffffff88ab3c56 RDI: ffffffff87684ea0
RBP: 00000000ffffffff R08: 0000000000000000 R09: fffffbfff14f0dd2
R10: ffffffff8a786e97 R11: 0000000000000000 R12: ffffffff81da17a7
R13: 0000000000000206 R14: ffff888109b31d40 R15: 0000000000000004
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock+0x1c/0x60 include/linux/rcupdate.h:871
 __folio_mod_stat mm/rmap.c:1412 [inline]
 __folio_remove_rmap mm/rmap.c:1777 [inline]
 folio_remove_rmap_ptes+0xec/0x270 mm/rmap.c:1804
 zap_present_folio_ptes mm/memory.c:1525 [inline]
 zap_present_ptes mm/memory.c:1586 [inline]
 do_zap_pte_range mm/memory.c:1687 [inline]
 zap_pte_range mm/memory.c:1731 [inline]
 zap_pmd_range mm/memory.c:1823 [inline]
 zap_pud_range mm/memory.c:1852 [inline]
 zap_p4d_range mm/memory.c:1873 [inline]
 unmap_page_range+0x1c35/0x3570 mm/memory.c:1894
 unmap_single_vma+0x194/0x2a0 mm/memory.c:1940
 unmap_vmas+0x22c/0x490 mm/memory.c:1984
 exit_mmap+0x1b9/0xb90 mm/mmap.c:1284
 __mmput kernel/fork.c:1379 [inline]
 mmput+0xdb/0x430 kernel/fork.c:1401
 exit_mm kernel/exit.c:589 [inline]
 do_exit+0x9d1/0x2c30 kernel/exit.c:940
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f067449ca61
Code: Unable to access opcode bytes at 0x7f067449ca37.
RSP: 002b:00007ffe298d8820 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffe RBX: 00000000000000b5 RCX: 00007f067449ca61
RDX: 0000000000090800 RSI: 00007f067451ecb0 RDI: 00000000ffffff9c
RBP: 00007ffe298d88cc R08: 000000000000a6f0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000041
R13: 0000000000000000 R14: 00000000000379b7 R15: 00007ffe298d8920
 </TASK>