INFO: task syz.4.2653:14176 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc7-syzkaller-00112-gf299cd11f753 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2653      state:D stack:28392 pid:14176 tgid:14175 ppid:2648   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xcda/0x2f80 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 usblp_open+0x5c/0x450 drivers/usb/class/usblp.c:417
 usb_open+0x213/0x2f0 drivers/usb/core/file.c:47
 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414
 do_dentry_open+0x957/0x1490 fs/open.c:959
 vfs_open+0x82/0x3f0 fs/open.c:1089
 do_open fs/namei.c:3727 [inline]
 path_openat+0x2141/0x2d20 fs/namei.c:3886
 do_filp_open+0x1dc/0x430 fs/namei.c:3913
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1442
 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: 0033:0x7f2fd181c890
RSP: 002b:00007f2fd0496b70 EFLAGS: 00000293
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f2fd181c890
RDX: 0000000000000002 RSI: 00007f2fd0496c10 RDI: 00000000ffffff9c
RBP: 00007f2fd0496c10 R08: 0000000000000000 R09: 00007f2fd0496987
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2fd19d5f80 R15: 00007ffc2e8b64d8
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u8:0/11:
 #0: 
ffff888100089148 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
 #1: 
ffffc900000bfd80
 (
(work_completion)(&sub_info->work)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
1 lock held by khungtaskd/30:
 #0: 
ffffffff88ebb660
 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626
2 locks held by getty/2604:
 #0: 
ffff888113a320a0
 (&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+0xfc8/0x1490 drivers/tty/n_tty.c:2211
5 locks held by kworker/1:3/4925:
 #0: 
ffff888105e8ad48
 (
(wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
 #1: 
ffffc900020cfd80
 (
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
 #2: 
ffff8881093fb190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
 #3: 
ffff88812e508190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295
 #4: ffff888109780160
 (&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1292
6 locks held by kworker/1:5/5229:
 #0: 
ffff888105e8ad48
 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
 #1: 
ffffc9000f7bfd80
 ((work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
 #2: 
ffff88810979f190
 (
&dev->mutex){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
 #3: 
ffff888117a9f190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1004
 #4: 
ffff88813b00b160
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1004
 #5: 
ffffffff899b0110 (
minor_rwsem#2
){++++}-{3:3}
, at: usb_register_dev+0x11c/0x550 drivers/usb/core/file.c:134
2 locks held by kworker/u8:1/7739:
 #0: 
ffff888100089148
 (
(wq_completion)events_unbound){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
 #1: 
ffffc9000fd8fd80
 (
(work_completion)(&sub_info->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
1 lock held by syz.1.2646/14162:
 #0: 
ffffffff89a69268
 (usblp_mutex
){+.+.}-{3:3}, at: usblp_release+0x7f/0x310 drivers/usb/class/usblp.c:480
2 locks held by syz.4.2653/14176:
 #0: 
ffffffff899b0110
 (
minor_rwsem#2
){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
 #1: 
ffffffff89a69268
 (
usblp_mutex){+.+.}-{3:3}
, at: usblp_open+0x5c/0x450 drivers/usb/class/usblp.c:417
2 locks held by syz.2.2666/14345:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
 #1: 
ffffffff89a69268
 (
usblp_mutex
){+.+.}-{3:3}
, at: usblp_open+0x5c/0x450 drivers/usb/class/usblp.c:417
2 locks held by syz.0.2673/14473:
 #0: 
ffffffff899b0110 (
minor_rwsem
#2
){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
 #1: 
ffffffff89a69268 (
usblp_mutex
){+.+.}-{3:3}
, at: usblp_open+0x5c/0x450 drivers/usb/class/usblp.c:417
1 lock held by syz.3.2677/14828:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2
){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
2 locks held by kworker/u8:4/14839:
 #0: 
ffff888100089148
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
 #1: 
ffffc90012187d80
 (
(work_completion)(&sub_info->work)
){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
1 lock held by syz.2.2689/16450:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2
){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
1 lock held by syz.0.2707/16955:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
1 lock held by syz.0.2707/16967:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
1 lock held by syz.4.2716/17253:
 #0: 
ffffffff899b0110
 (
minor_rwsem
#2){++++}-{3:3}
, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38
1 lock held by syz.1.2733/18455:
1 lock held by modprobe/18520:
1 lock held by modprobe/18530:
1 lock held by modprobe/18531:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc7-syzkaller-00112-gf299cd11f753 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
 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:
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2639 Comm: syz-executor Not tainted 6.11.0-rc7-syzkaller-00112-gf299cd11f753 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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 61 ed 0e ff eb a0 e8 ea ed 0e
RSP: 0018:ffffc90000007590 EFLAGS: 00000002
RAX: 0000000000000030 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff829bdec5 RDI: ffffffff935cfbc0
RBP: ffffffff935cfb80 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000030 R14: ffffffff829bde60 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8355f87d60 CR3: 000000011aac6000 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+0xce7/0x1090 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:2983 [inline]
 console_flush_all+0x53c/0xd70 kernel/printk/printk.c:3049
 console_unlock+0xae/0x290 kernel/printk/printk.c:3118
 vprintk_emit+0x409/0x600 kernel/printk/printk.c:2348
 dev_vprintk_emit drivers/base/core.c:4912 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4923
 __dev_printk+0xf5/0x270 drivers/base/core.c:4935
 _dev_warn+0xe5/0x120 drivers/base/core.c:4979
 usb_rx_callback_intf0+0x11c/0x1a0 drivers/media/rc/imon.c:1768
 __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+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1988
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1770
 handle_softirqs+0x209/0x8e0 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:1043 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5727
Code: c1 05 7a b0 cf 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000187f750 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200030feec RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8727fcc0 RDI: ffffffff87469a40
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff1f4a3dc
R10: ffffffff8fa51ee7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff88ebb660 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 __lruvec_stat_mod_folio+0xb8/0x450 mm/memcontrol.c:760
 __folio_mod_stat mm/rmap.c:1278 [inline]
 __folio_remove_rmap mm/rmap.c:1572 [inline]
 folio_remove_rmap_ptes+0x316/0x390 mm/rmap.c:1599
 zap_present_folio_ptes mm/memory.c:1517 [inline]
 zap_present_ptes mm/memory.c:1576 [inline]
 zap_pte_range mm/memory.c:1618 [inline]
 zap_pmd_range mm/memory.c:1736 [inline]
 zap_pud_range mm/memory.c:1765 [inline]
 zap_p4d_range mm/memory.c:1786 [inline]
 unmap_page_range+0x10dc/0x3200 mm/memory.c:1807
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1853
 unmap_vmas+0x22f/0x490 mm/memory.c:1897
 exit_mmap+0x1b8/0xb20 mm/mmap.c:3412
 __mmput kernel/fork.c:1345 [inline]
 mmput+0xdb/0x3e0 kernel/fork.c:1367
 exit_mm kernel/exit.c:571 [inline]
 do_exit+0x9bf/0x2b30 kernel/exit.c:869
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
 __do_sys_exit_group kernel/exit.c:1042 [inline]
 __se_sys_exit_group kernel/exit.c:1040 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
 x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f835529def9
Code: Unable to access opcode bytes at 0x7f835529decf.
RSP: 002b:00007ffd00cd2138 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8355325547 RCX: 00007f835529def9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f8355325565 R08: 00007ffd00ccfed7 R09: 0000000000000004
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000009
R13: 0000000000000004 R14: 00007ffd00cd225c R15: 00007ffd00cd22f0
 </TASK>