syzbot

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
 0-...D } 2677 jiffies s: 21405 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):

Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4935 Comm: kworker/0:4 Not tainted 6.12.0-rc3-syzkaller-00035-g7b5a58952fc3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: mm_percpu_wq vmstat_update
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 b1 ef 0d ff eb a0 e8 3a f0 0d
RSP: 0018:ffffc90000006f60 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82a06b75 RDI: ffffffff93635660
RBP: ffffffff93635620 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff82a06b10 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dc1fffc CR3: 0000000116670000 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
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x1b7/0x3d0 arch/x86/kernel/dumpstack.c:285
 sched_show_task kernel/sched/core.c:7589 [inline]
 sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7564
 show_state_filter+0xee/0x320 kernel/sched/core.c:7634
 k_spec drivers/tty/vt/keyboard.c:667 [inline]
 k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
 kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
 kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1541
 input_handler_events_default+0x116/0x1b0 drivers/input/input.c:2549
 input_pass_values+0x777/0x8e0 drivers/input/input.c:126
 input_event_dispose drivers/input/input.c:352 [inline]
 input_handle_event+0xb30/0x14d0 drivers/input/input.c:369
 input_event drivers/input/input.c:398 [inline]
 input_event+0x83/0xa0 drivers/input/input.c:390
 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1719
 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540
 hid_input_array_field+0x535/0x710 drivers/hid/hid-core.c:1652
 hid_process_report drivers/hid/hid-core.c:1694 [inline]
 hid_report_raw_event+0xa02/0x11c0 drivers/hid/hid-core.c:2040
 __hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2110
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:285
 __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: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:1037 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1037
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x70 kernel/kcov.c:217
Code: 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 d4 e4 ad 7e 65 8b 05 d5 e4 ad 7e <a9> 00 01 ff 00 48 8b 34 24 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75
RSP: 0018:ffffc900029efc28 EFLAGS: 00000206
RAX: 0000000080000000 RBX: ffffffffffffffa6 RCX: ffffffff8142e6a9
RDX: ffff88811dcc57c0 RSI: ffffffff8142e6b3 RDI: 0000000000000007
RBP: 000000000000005a R08: 0000000000000007 R09: 0000000000000000
R10: ffffffffffffffa6 R11: 0000000000043200 R12: 000000000000005a
R13: 0000000000000000 R14: 1ffff9200053df86 R15: 00000001000094e2
 round_jiffies_relative+0x101/0x150 kernel/time/timer.c:482
 vmstat_update mm/vmstat.c:2006 [inline]
 vmstat_update+0x32/0xb0 mm/vmstat.c:1998
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 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>
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246
 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07866410 R08: 0000000000000007 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca07861000
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:udevd           state:S stack:27312 pid:10252 tgid:10252 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07867c10 R08: 0000000000000000 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca0786b600
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:udevd           state:S stack:24064 pid:10269 tgid:10269 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca0785d550 R08: 0000000000000007 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca07898020
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:udevd           state:S stack:26016 pid:10270 tgid:10270 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07866410 R08: 0000000000000007 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca07895380
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:kworker/0:7     state:I stack:22640 pid:10746 tgid:10746 ppid:2      flags:0x00004000
Workqueue:  0x0
 (events)

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 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>
task:kworker/1:2     state:I
 stack:29152 pid:11066 tgid:11066 ppid:2      flags:0x00004000
Workqueue:  0x0 (events)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 worker_thread+0x2de/0xf00 kernel/workqueue.c:3406
 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>
task:udevd           state:S stack:27856 pid:11248 tgid:11248 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246
 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07866410 R08: 0000000000000004 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca0787e150
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:udevd           state:S stack:28384 pid:11249 tgid:11249 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07866410 R08: 0000000000000007 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca078929e0
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:udevd           state:S stack:24272 pid:11250 tgid:11250 ppid:2549   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_hrtimeout_range_clock+0x369/0x3b0 kernel/time/hrtimer.c:2272
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x139b/0x1a90 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2466
 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: 0033:0x7f1baf95c457
RSP: 002b:00007fff2ec30d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1baf95c457
RDX: 0000000000000004 RSI: 00007fff2ec30dd8 RDI: 0000000000000004
RBP: 000055ca07866410 R08: 0000000000000007 R09: 6d60a136f79c7c0b
R10: 00000000ffffffff R11: 0000000000000246 R12: 000055ca0789a150
R13: 00007fff2ec30dd8 R14: 00000000ffffffff R15: 000055ca078302c0
 </TASK>
task:syz.2.1368      state:D stack:27856 pid:11901 tgid:11901 ppid:7969   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77c380dff9
RSP: 002b:00007ffcae552c28 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 00007ffcae552d50 RCX: 00007f77c380dff9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f77c39c5f8c
RBP: 00007f77c39c5f8c R08: 00007f77c368a080 R09: 00007ffcae552f1f
R10: 00007ffcae552d30 R11: 0000000000000246 R12: 00000000000a6d8f
R13: 00007ffcae552d30 R14: 000000000000015e R15: 00000000000a6c31
 </TASK>
task:syz.4.1372      state:D stack:27776 pid:11914 tgid:11911 ppid:7974   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62b211dbfb
RSP: 002b:00007f62b0d94f10 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f62b211dbfb
RDX: 00007f62b0d95fe0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f62b0d95fe0 R08: 0000000000000000 R09: 00342e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000020000080 R15: 00007f62b219a273
 </TASK>
task:syz.1.1373      state:D stack:27600 pid:11912 tgid:11912 ppid:7967   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d3e85dff9
RSP: 002b:00007ffd77e0bc18 EFLAGS: 00000246
 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 00007ffd77e0bd40 RCX: 00007f6d3e85dff9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6d3ea15f8c
RBP: 00007f6d3ea15f8c R08: 00007f6d3e6da080 R09: 00007ffd77e0bf0f
R10: 00007ffd77e0bd20 R11: 0000000000000246 R12: 00000000000a750c
R13: 00007ffd77e0bd20 R14: 0000000000000bea R15: 00000000000a6922
 </TASK>
task:syz.3.1374      state:D stack:28656 pid:11916 tgid:11915 ppid:7978   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 synchronize_rcu_expedited+0x392/0x450 kernel/rcu/tree_exp.h:991
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_register_driver_owner+0x20f/0x330 drivers/usb/gadget/udc/core.c:1722
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:595 [inline]
 raw_ioctl+0x1731/0x2b90 drivers/usb/gadget/legacy/raw_gadget.c:1306
 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: 0033:0x7fd96aa8dbfb
RSP: 002b:00007fd969704f10 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fd96aa8dbfb
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007fd969705fe0 R08: 0000000000000000 R09: 00332e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd969704fb0 R14: 0000000020000200 R15: 00007fd96ad70b88
 </TASK>
task:syz.0.1375      state:D stack:27856 pid:11919 tgid:11918 ppid:7965   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 module_remove_driver+0x2e/0x260 drivers/base/module.c:106
 bus_remove_driver+0x143/0x2c0 drivers/base/bus.c:745
 driver_unregister+0x76/0xb0 drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xadd/0x2ce0 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f21d831dbfb
RSP: 002b:00007f21d6f94f10 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f21d831dbfb
RDX: 00007f21d6f95fe0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f21d6f95fe0 R08: 0000000000000000 R09: 00302e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000020000040 R15: 00007f21d839a273
 </TASK>
task:syz-executor    state:D stack:26336 pid:11921 tgid:11921 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 namespace_unlock+0x1b5/0x490 fs/namespace.c:1703
 drop_collected_mounts fs/namespace.c:2225 [inline]
 put_mnt_ns fs/namespace.c:5553 [inline]
 put_mnt_ns+0xf4/0x130 fs/namespace.c:5549
 free_nsproxy+0x47/0x470 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces+0xeb/0x100 kernel/nsproxy.c:251
 do_exit+0xad8/0x2ce0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9449fffe33
RSP: 002b:00007fff75d67668 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: 0000000000000058 RBX: 00007f944ace4620 RCX: 00007f9449fffe33
RDX: 0000000000000058 RSI: 00007f944ace4670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff75d67684 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f944ace4670 R15: 0000000000000000
 </TASK>
task:syz-executor    state:D stack:25792 pid:11939 tgid:11939 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 namespace_unlock+0x1b5/0x490 fs/namespace.c:1703
 drop_collected_mounts fs/namespace.c:2225 [inline]
 put_mnt_ns fs/namespace.c:5553 [inline]
 put_mnt_ns+0xf4/0x130 fs/namespace.c:5549
 free_nsproxy+0x47/0x470 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces+0xeb/0x100 kernel/nsproxy.c:251
 do_exit+0xad8/0x2ce0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc07802dbfb
RSP: 002b:00007ffe5209b4d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffed RBX: 0000000000000005 RCX: 00007fc07802dbfb
RDX: 00007ffe5209b530 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffe5209b530 R08: 0000000000000005 R09: 006e616c765f3068
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fc0780a0ea5 R14: 00007fc078d14620 R15: 0000000000000003
 </TASK>
task:syz-executor    state:D stack:26784 pid:11942 tgid:11942 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 namespace_unlock+0x1b5/0x490 fs/namespace.c:1703
 drop_collected_mounts fs/namespace.c:2225 [inline]
 put_mnt_ns fs/namespace.c:5553 [inline]
 put_mnt_ns+0xf4/0x130 fs/namespace.c:5549
 free_nsproxy+0x47/0x470 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces+0xeb/0x100 kernel/nsproxy.c:251
 do_exit+0xad8/0x2ce0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77c03adbfb
RSP: 002b:00007ffe0bd70450 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffed RBX: 0000000000000005 RCX: 00007f77c03adbfb
RDX: 00007ffe0bd704b0 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffe0bd704b0 R08: 0000000000000005 R09: 006e616c765f3068
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f77c0420ea5 R14: 00007f77c1094620 R15: 0000000000000003
 </TASK>
task:syz-executor    state:D
 stack:26784 pid:11963 tgid:11963 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 namespace_unlock+0x1b5/0x490 fs/namespace.c:1703
 drop_collected_mounts fs/namespace.c:2225 [inline]
 put_mnt_ns fs/namespace.c:5553 [inline]
 put_mnt_ns+0xf4/0x130 fs/namespace.c:5549
 free_nsproxy+0x47/0x470 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces+0xeb/0x100 kernel/nsproxy.c:251
 do_exit+0xad8/0x2ce0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb335cfdbfb
RSP: 002b:00007ffe3f937b70 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffed RBX: 0000000000000005 RCX: 00007fb335cfdbfb
RDX: 00007ffe3f937bd0 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffe3f937bd0 R08: 0000000000000004 R09: 00315f6576616c73
R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000003
R13: 00007fb3369e4620 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:syz-executor    state:D stack:26416 pid:11991 tgid:11991 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x105f/0x34b0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 exp_funnel_lock+0x344/0x3b0 kernel/rcu/tree_exp.h:320
 synchronize_rcu_expedited+0x290/0x450 kernel/rcu/tree_exp.h:976
 namespace_unlock+0x1b5/0x490 fs/namespace.c:1703
 drop_collected_mounts fs/namespace.c:2225 [inline]
 put_mnt_ns fs/namespace.c:5553 [inline]
 put_mnt_ns+0xf4/0x130 fs/namespace.c:5549
 free_nsproxy+0x47/0x470 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces+0xeb/0x100 kernel/nsproxy.c:251
 do_exit+0xad8/0x2ce0 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [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/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f