rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D
 } 2660 jiffies s: 22693 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: 14619 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00029-g64f3b5a6bc49 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:preempt_count_add+0x2d/0x150 kernel/sched/core.c:5793
Code: fa 48 c7 c0 80 99 4a 93 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1 e9 03 83 c0 03 65 01 3d 0b 86 db 7e <0f> b6 14 11 38 d0 7c 08 84 d2 0f 85 dd 00 00 00 8b 15 6d 5b 22 12
RSP: 0018:ffffc90000006ee8 EFLAGS: 00000086
RAX: 0000000000000003 RBX: 0000000000000001 RCX: 1ffffffff2695330
RDX: dffffc0000000000 RSI: ffffffff8746ea00 RDI: 0000000000000001
RBP: 00000268e9e864ca R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000002700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000899 R14: fffffbfff26c6b1e R15: dffffc0000000000
FS:  0000555569449500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcefda1c68 CR3: 000000012b224000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 delay_tsc+0x3c/0xc0 arch/x86/lib/delay.c:79
 wait_for_lsr+0x96/0x180 drivers/tty/serial/8250/8250_port.c:2074
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
 serial8250_console_write+0xf5a/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+0x330/0x710 drivers/hid/hid-core.c:1644
 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:__seqprop_raw_spinlock_sequence include/linux/seqlock.h:226 [inline]
RIP: 0010:ktime_get_coarse_real_ts64+0xb0/0x200 kernel/time/timekeeping.c:2390
Code: 24 40 48 c7 c7 48 d7 ee 88 e8 6c 66 ef ff 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 4a 01 12 00 48 85 db 58 0f 85 18 01 00 00 <e8> cb fe 11 00 eb 07 e8 c4 fe 11 00 f3 90 8b 1d dc f6 aa 07 41 89
RSP: 0018:ffffc9000287fcc0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8143e157
RDX: ffff88812b25ba80 RSI: ffffffff8143e162 RDI: 0000000000000007
RBP: ffffc9000287fd30 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff9200050ffa2
R13: fffff5200050ffa7 R14: fffff5200050ffa6 R15: 00000000000041ff
 current_time fs/inode.c:2648 [inline]
 inode_set_ctime_current+0x84/0x140 fs/inode.c:2662
 shmem_mknod+0x169/0x240 mm/shmem.c:3590
 shmem_mkdir+0x31/0x60 mm/shmem.c:3634
 vfs_mkdir+0x57d/0x860 fs/namei.c:4257
 do_mkdirat+0x1b1/0x390 fs/namei.c:4280
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4293
 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: 0033:0x7fa78b2ac897
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcefda3508 EFLAGS: 00000202 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffcefda3550 RCX: 00007fa78b2ac897
RDX: 00000000000001ff RSI: 00007ffcefda3550 RDI: 00000000ffffff9c
RBP: 00007ffcefda353c R08: 0000000000000004 R09: 00007ffcefda32a6
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032
R13: 000000000011eb00 R14: 000000000011e7c3 R15: 00007ffcefda3590
 </TASK>
 </TASK>
task:kworker/u8:4    state:I stack:30928 pid:18519 tgid:18519 ppid:2      flags:0x00004000
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>

Showing all locks held in the system:
2 locks held by getty/2605:
 #0: ffff88810aaf60a0 (&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
6 locks held by kworker/1:6/5012:
 #0: ffff8881062c3548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc9000ee27d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff888109ba3190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
 #2: ffff888109ba3190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
 #3: ffff88812268b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
 #3: ffff88812268b190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295
 #4: ffff888126a48160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
 #4: ffff888126a48160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
 #4: ffff888126a48160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
 #5: ffff888131301a20 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
 #5: ffff888131301a20 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
 #5: ffff888131301a20 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
4 locks held by kworker/0:6/9949:
6 locks held by syz-executor/14619:
 #0: ffff88811b6ee3f8 (sb_writers#6){.+.+}-{0:0}, at: filename_create+0x10d/0x530 fs/namei.c:4019
 #1: ffff88811e4d0f60 (&type->i_mutex_dir_key#5/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]
 #1: ffff88811e4d0f60 (&type->i_mutex_dir_key#5/1){+.+.}-{3:3}, at: filename_create+0x1c2/0x530 fs/namei.c:4026
 #2: ffff888126a4b230 (&dev->event_lock){..-.}-{2:2}, at: input_event drivers/input/input.c:397 [inline]
 #2: ffff888126a4b230 (&dev->event_lock){..-.}-{2:2}, at: input_event+0x70/0xa0 drivers/input/input.c:390
 #3: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #3: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: input_pass_values+0x8b/0x8e0 drivers/input/input.c:118
 #4: ffffffff893879d8 (kbd_event_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #4: ffffffff893879d8 (kbd_event_lock){..-.}-{2:2}, at: kbd_event+0x8a/0x17a0 drivers/tty/vt/keyboard.c:1535
 #5: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #5: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #5: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
1 lock held by syz.0.2352/17790:
 #0: ffffffff88ec69f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
1 lock held by syz.4.2355/17797:
 #0: ffffffff88ec69f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329

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

keytouch 0003:0926:3333.016D: can't resubmit intr, dummy_hcd.2-1/input0, status -19
keytouch 0003:0926:3333.016D: usb_submit_urb(ctrl) failed: -19