rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (0 ticks this GP) idle=be64/1/0x4000000000000000 softirq=39765/39765 fqs=1674 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 0 0 0 ==> 52550(ms) rcu: (detected by 1, t=10506 jiffies, g=35829, q=281761 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2949 Comm: syz-executor Not tainted 6.13.0-syzkaller-09030-g6d61a53dd6f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:416 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 81 4a 0c ff eb a0 e8 0a 4b 0c RSP: 0018:ffffc90000006f78 EFLAGS: 00000002 RAX: 0000000000000020 RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: ffffffff82c8ead5 RDI: ffffffff936732e0 RBP: ffffffff936732a0 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000008 R12: 0000000000000000 R13: 0000000000000020 R14: ffffffff82c8ea70 R15: 0000000000000000 FS: 0000555559060500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f11900e56c0 CR3: 0000000131076000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_out drivers/tty/serial/8250/8250.h:142 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3342 [inline] serial8250_console_write+0xf9e/0x17c0 drivers/tty/serial/8250/8250_port.c:3413 console_emit_next_record kernel/printk/printk.c:3122 [inline] console_flush_all+0x800/0xc60 kernel/printk/printk.c:3210 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0xd9/0x210 kernel/printk/printk.c:3309 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432 _printk+0xc8/0x100 kernel/printk/printk.c:2457 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:7719 [inline] sched_show_task+0x424/0x630 kernel/sched/core.c:7694 show_state_filter+0xee/0x320 kernel/sched/core.c:7764 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_handle_events_default+0x116/0x1b0 drivers/input/input.c:2575 input_pass_values+0x6c4/0x890 drivers/input/input.c:127 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:395 [inline] input_event+0x83/0xb0 drivers/input/input.c:390 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1716 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1548 hid_input_array_field+0x535/0x710 drivers/hid/hid-core.c:1660 hid_process_report drivers/hid/hid-core.c:1702 [inline] hid_report_raw_event+0xabc/0x1280 drivers/hid/hid-core.c:2048 __hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2118 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+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1738 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1802 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1819 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:finish_task_switch.isra.0+0x1e5/0xa40 kernel/sched/core.c:5251 Code: 0f 85 ad 07 00 00 8b 0d 6d d9 09 09 85 c9 0f 85 cb 02 00 00 48 89 df e8 e9 2c cc 05 e8 54 82 35 00 fb 65 48 8b 1d bb 6f b6 7e <48> 8d bb 40 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000154fab0 EFLAGS: 00000202 RAX: 00000000000d7861 RBX: ffff888107bd57c0 RCX: 1ffffffff14adbf1 RDX: 0000000000000000 RSI: ffffffff872804c0 RDI: ffffffff87478560 RBP: ffffc9000154faf8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8a571997 R11: 0000000000000000 R12: ffff8881f583d298 R13: ffff888107b90000 R14: 0000000000000000 R15: ffff8881f583d298 context_switch kernel/sched/core.c:5380 [inline] __schedule+0x1145/0x35d0 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6856 do_nanosleep+0x216/0x510 kernel/time/hrtimer.c:2078 hrtimer_nanosleep+0x158/0x380 kernel/time/hrtimer.c:2125 common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1356 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1379 [inline] __x64_sys_clock_nanosleep+0x344/0x4a0 kernel/time/posix-timers.c:1379 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: 0033:0x7f0dab85f623 Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 1e df 1b 00 00 74 14 b8 e6 00 00 00 0f 05 d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10 RSP: 002b:00007ffdb076ba88 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000107 RCX: 00007f0dab85f623 RDX: 00007ffdb076baa0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffdb076bb0c R08: 000000000000cb28 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000001388 R13: 00000000000927c0 R14: 000000000004864c R15: 00007ffdb076bb60 task:kworker/u8:2 state:R running task stack:32568 pid:8812 tgid:8812 ppid:37 task_flags:0x8040 flags:0x00004000 Call Trace: __switch_to_asm+0x70/0x70 task:kworker/u8:6 state:R running task stack:24640 pid:8815 tgid:8815 ppid:0 task_flags:0x40800c flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x113d/0x35d0 kernel/sched/core.c:6764 do_task_dead+0xd6/0x110 kernel/sched/core.c:6780 do_exit+0x1de2/0x2ce0 kernel/exit.c:989 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096 x64_sys_call+0x151f/0x1720 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: 0033:0x7f851703fa90 RSP: 002b:00007ffe049ec828 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f8517130860 RCX: 00007f851703fa90 RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00007f8517130860 R08: 0000000000000001 R09: b816ba5b1e042c68 R10: 00007ffe049ec6e0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f8517134658 R15: 0000000000000001 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: #0: ffffffff88ecabb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:334 2 locks held by getty/2902: #0: ffff8881123d50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 4 locks held by syz-executor/2949: #0: ffff8881356ee230 (&dev->event_lock){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:572 [inline] #0: ffff8881356ee230 (&dev->event_lock){..-.}-{3:3}, at: input_event drivers/input/input.c:394 [inline] #0: ffff8881356ee230 (&dev->event_lock){..-.}-{3:3}, at: input_event+0x70/0xb0 drivers/input/input.c:390 #1: ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #1: ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1161 [inline] #1: ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8b/0x890 drivers/input/input.c:118 #2: ffffffff89399b78 (kbd_event_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffffff89399b78 (kbd_event_lock){..-.}-{3:3}, at: kbd_event+0x8a/0x17a0 drivers/tty/vt/keyboard.c:1535 #3: ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] ffffffff88ebf740 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746 3 locks held by kworker/1:4/5225: #0: ffff888100080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90001f8fd18 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffff88810b3a8190 ( &dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] &dev->mutex){....}-{4:4}, at: ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1161 [inline] &dev->mutex){....}-{4:4}, at: ath9k_hif_usb_firmware_cb+0x3b1/0x620 drivers/net/wireless/ath/ath9k/hif_usb.c:1294 6 locks held by kworker/1:5/5296: #0: ffff888106ae8948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90002177d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffff88810b35f190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff88810b35f190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5851 #3: ffff88811b92a190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff88811b92a190 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2296 #4: ffff88811abbe160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff88811abbe160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff88811abbe160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 #5: ffff88811af7da20 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #5: ffff88811af7da20 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #5: ffff88811af7da20 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 5 locks held by kworker/0:6/5333: 1 lock held by syz.4.483/6766: #0: ffffffff88ecabb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:302 ============================================= keytouch 0003:0926:3333.0049: can't resubmit intr, dummy_hcd.4-1/input0, status -19