rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
 0-....
 } 2668 jiffies s: 21065 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):

Sending NMI from CPU 1 to CPUs 0:
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
NMI backtrace for cpu 0
CPU: 0 PID: 5181 Comm: kworker/0:4 Not tainted 6.10.0-rc6-syzkaller-00119-gb72749301112 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events line6_startup_work
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 c1 90 0b ff eb a0 e8 4a 91 0b
RSP: 0018:ffffc90000007470 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff829c3035 RDI: ffffffff8d72f9e0
RBP: ffffffff8d72f9a0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff829c2fd0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54845ca440 CR3: 000000000849e000 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:122 [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:2913 [inline]
 console_flush_all+0x53c/0xd70 kernel/printk/printk.c:2979
 console_unlock+0xae/0x290 kernel/printk/printk.c:3048
 vprintk_emit kernel/printk/printk.c:2348 [inline]
 vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2373
 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+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:note_gp_changes+0x171/0x1e0 kernel/rcu/tree.c:1309
Code: 89 ef e8 e2 6d 5c 05 84 db 0f 84 79 ff ff ff 5b 5d 41 5c 41 5d 41 5e e9 1d e7 ff ff e8 98 56 20 00 9c 58 f6 c4 02 75 3d fb 5b <5d> 41 5c 41 5d 41 5e c3 cc cc cc cc e8 ae 54 20 00 e9 98 fe ff ff
RSP: 0018:ffffc90000007df0 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8881f643e640 RCX: 1ffffffff19a402c
RDX: 0000000000000000 RSI: ffffffff86c7d680 RDI: ffffffff86e78a80
RBP: ffffffff886bf380 R08: 0000000000000001 R09: fffffbfff199a9b4
R10: ffffffff8ccd4da7 R11: 0000000000000002 R12: 0000000000000202
R13: 0000000000000200 R14: 0000000000072305 R15: ffff8881f643e652
 rcu_check_quiescent_state kernel/rcu/tree.c:2419 [inline]
 rcu_core+0x141/0x16b0 kernel/rcu/tree.c:2793
 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:__orc_find+0xb5/0x130 arch/x86/kernel/unwind_orc.c:102
Code: 48 01 d0 48 d1 f8 4c 8d 3c 83 4c 89 fa 48 c1 ea 03 42 0f b6 0c 32 4c 89 fa 83 e2 07 83 c2 03 38 ca 7c 04 84 c9 75 73 49 63 17 <4c> 89 e7 4d 8d 2c 17 4c 89 ee e8 8c 14 3e 00 4d 39 ec 73 95 e8 12
RSP: 0018:ffffc90001f0f700 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff89eea098 RCX: 0000000000000000
RDX: fffffffffa3ed532 RSI: ffffffff81152b7a RDI: 0000000000000006
RBP: ffffffff89eea0b0 R08: 0000000000000006 R09: ffffffff842d75ce
R10: ffffffff842d7578 R11: 0000000000000002 R12: ffffffff842d75ce
R13: ffffffff842d7578 R14: dffffc0000000000 R15: ffffffff89eea0a4
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x335/0x23a0 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x14/0x30 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4438 [inline]
 kfree+0x10b/0x380 mm/slub.c:4559
 urb_destroy drivers/usb/core/urb.c:27 [inline]
 kref_put include/linux/kref.h:65 [inline]
 usb_free_urb.part.0+0xaf/0x110 drivers/usb/core/urb.c:97
 usb_free_urb+0x1f/0x30 drivers/usb/core/urb.c:96
 line6_send_raw_message_async_part+0x4a8/0x720 sound/usb/line6/driver.c:190
 line6_send_raw_message_async+0x11f/0x180 sound/usb/line6/driver.c:224
 line6_version_request_async+0x41/0x60 sound/usb/line6/driver.c:241
 pod_startup+0xfe/0x170 sound/usb/line6/pod.c:281
 line6_startup_work+0x46/0x60 sound/usb/line6/driver.c:728
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248
 process_scheduled_works kernel/workqueue.c:3329 [inline]
 worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
 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>
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting
gspca_pac7302 2-1:0.0: URB error -71, resubmitting