INFO: task syz-executor:16028 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc4-syzkaller-00066-gbf373d2919d9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:24064 pid:16028 tgid:16028 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x124/0x330 kernel/locking/rwsem.c:1526
 kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
 d_revalidate fs/namei.c:868 [inline]
 d_revalidate fs/namei.c:865 [inline]
 lookup_fast+0x239/0x540 fs/namei.c:1693
 walk_component+0x5b/0x5b0 fs/namei.c:2049
 link_path_walk.part.0.constprop.0+0x669/0xd40 fs/namei.c:2418
 link_path_walk fs/namei.c:2350 [inline]
 path_openat+0x228/0x2d60 fs/namei.c:3929
 do_filp_open+0x1dc/0x430 fs/namei.c:3960
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a74a4e011
RSP: 002b:00007ffd3beef5c0 EFLAGS: 00000287
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000336 RCX: 00007f6a74a4e011
RDX: 0000000000090800 RSI: 00007f6a74ac164e RDI: 00000000ffffff9c
RBP: 00007ffd3beef65c R08: 000000000005a87e R09: 00007f6a7573f080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 00000000001d19d4 R14: 00000000001d1560 R15: 00007ffd3beef6b0
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:1/9:
1 lock held by khungtaskd/30:
 #0: ffffffff88ebb140 (rcu_read_lock){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
6 locks held by udevd/2861:
2 locks held by getty/2919:
 #0: 
ffff8881120d40a0
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: 
ffffc900000432f0 (
&ldata->atomic_read_lock){+.+.}-{3:3}
, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:7/15387:
1 lock held by syz-executor/17660:
 #0: 
ffffffff88ec6a38
 (
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329
5 locks held by kworker/1:2/18868:
 #0: ffff8881062bad48
 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: 
ffffc900049dfd80
 (
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff88810ab4b190
 (&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1014 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
 #3: 
ffff8881390a8190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1014 [inline]
, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295
 #4: 
ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_find_and_get_ns+0x71/0xc0 fs/kernfs/dir.c:918
1 lock held by udevd/19306:
 #0: ffff888100abc148
 (&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by udevd/19307:
 #0: 
ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by udevd/19308:
1 lock held by udevd/19310:
 #0: ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by udevd/19315:
 #0: 
ffff888100abc148
 (
&root->kernfs_rwsem){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by udevd/19568:
 #0: 
ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by udevd/19588:
1 lock held by udevd/21012:
1 lock held by syz.3.4401/23256:
 #0: 
ffff888100abc148 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_add_one+0xb1/0x520 fs/kernfs/dir.c:778
1 lock held by syz.0.4405/23267:
 #0: ffff888100abc148 (&root->kernfs_rwsem){++++}-{3:3}
, at: kernfs_remove_by_name_ns+0x87/0x130 fs/kernfs/dir.c:1689
1 lock held by syz.2.4406/23270:
 #0: ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_add_one+0xb1/0x520 fs/kernfs/dir.c:778
1 lock held by syz.2.4406/23271:
 #0: 
ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_add_one+0xb1/0x520 fs/kernfs/dir.c:778
1 lock held by syz.4.4407/23273:
 #0: 
ffff888100abc148 (
&root->kernfs_rwsem){++++}-{3:3}
, at: kernfs_remove_by_name_ns+0x87/0x130 fs/kernfs/dir.c:1689
1 lock held by syz-executor/23275:
 #0: ffff888100abc148 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by syz-executor/23276:
 #0: ffff888100abc148
 (
&root->kernfs_rwsem){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by syz-executor/23277:
1 lock held by syz-executor/23278:
 #0: ffff888100abc148
 (
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
1 lock held by syz-executor/23279:
1 lock held by udevd/23281:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc4-syzkaller-00066-gbf373d2919d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xf0c/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
gspca_pac7302 4-1:0.183: URB error -71, resubmitting
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 23279 Comm: syz-executor Not tainted 6.12.0-rc4-syzkaller-00066-gbf373d2919d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:413
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 31 f0 0d ff eb a0 e8 ba f0 0d
RSP: 0018:ffffc90000007680 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82a08975 RDI: ffffffff93637660
RBP: ffffffff93637620 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff82a08910 R15: 0000000000000000
FS:  0000555569131500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005606941a572e CR3: 000000011fb02000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:142 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3322 [inline]
 serial8250_console_write+0xf9e/0x17c0 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:3092 [inline]
 console_flush_all+0x800/0xc60 kernel/printk/printk.c:3180
 __console_flush_and_unlock kernel/printk/printk.c:3239 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3279
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2407
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:68
 _printk+0xc8/0x100 kernel/printk/printk.c:2432
 int_irq+0x1b7/0x270 drivers/media/usb/gspca/gspca.c:104
 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x17f0/0x3930 drivers/usb/gadget/udc/dummy_hcd.c:1993
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772
 handle_softirqs+0x206/0x8d0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xac/0x110 kernel/softirq.c:649
 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_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5790
Code: b8 ff ff ff ff 65 0f c1 05 50 1f cf 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffffc90004b37b20 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 1ffff92000966f65 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8727f520 RDI: ffffffff8746ebc0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff1f561b6
R10: ffffffff8fab0db7 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8903e4c0 R14: 0000000000000000 R15: 0000000000000000
 __fs_reclaim_acquire mm/page_alloc.c:3834 [inline]
 fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3848
 might_alloc include/linux/sched/mm.h:318 [inline]
 slab_pre_alloc_hook mm/slub.c:4036 [inline]
 slab_alloc_node mm/slub.c:4114 [inline]
 __kmalloc_cache_node_noprof+0x52/0x300 mm/slub.c:4303
 kmalloc_node_noprof include/linux/slab.h:901 [inline]
 __get_vm_area_node+0xe1/0x2d0 mm/vmalloc.c:3106
 __vmalloc_node_range_noprof+0x26a/0x15a0 mm/vmalloc.c:3788
 vmalloc_user_noprof+0x6b/0x90 mm/vmalloc.c:3982
 kcov_ioctl+0x4c/0x730 kernel/kcov.c:716
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7ea84e31b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffe9b272400 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007fe7ea84e31b
RDX: 0000000000040000 RSI: ffffffff80086301 RDI: 00000000000000d8
RBP: 00007fe7eaa06018 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>