rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2660 jiffies s: 60397 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: 2535 Comm: klogd Not tainted 6.11.0-rc7-syzkaller-00152-g68d4209158f4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x5a/0x70 kernel/kcov.c:222 Code: 35 8b 82 54 15 00 00 85 c0 74 2b 8b 82 30 15 00 00 83 f8 02 75 20 48 8b 8a 38 15 00 00 8b 92 34 15 00 00 48 8b 01 48 83 c0 01 <48> 39 d0 73 07 48 89 01 48 89 34 c1 c3 cc cc cc cc 0f 1f 44 00 00 RSP: 0018:ffffc90000007110 EFLAGS: 00000016 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90001001000 RDX: 0000000000040000 RSI: ffffffff81241809 RDI: ffffffff888faa60 RBP: ffffffff935cfb80 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000036b0 R13: ffffffff88c0f200 R14: 0000000100026008 R15: 0000000100025319 FS: 00007f4e07080380(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200012b8 CR3: 000000011586a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: wq_watchdog_touch+0xc9/0x1c0 kernel/workqueue.c:7544 touch_nmi_watchdog include/linux/nmi.h:151 [inline] wait_for_lsr+0xa0/0x180 drivers/tty/serial/8250/8250_port.c:2075 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline] serial8250_console_write+0xca3/0x1090 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 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline] show_trace_log_lvl+0x211/0x500 arch/x86/kernel/dumpstack.c:285 sched_show_task kernel/sched/core.c:7432 [inline] sched_show_task+0x42e/0x650 kernel/sched/core.c:7406 show_state_filter+0xee/0x320 kernel/sched/core.c:7477 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:2552 input_pass_values+0x777/0x8e0 drivers/input/input.c:126 input_event_dispose drivers/input/input.c:341 [inline] input_handle_event+0xf0b/0x14d0 drivers/input/input.c:369 input_event drivers/input/input.c:398 [inline] input_event+0x83/0xa0 drivers/input/input.c:390 input_sync include/linux/input.h:451 [inline] hidinput_report_event+0xb2/0x100 drivers/hid/hid-input.c:1763 hid_report_raw_event+0x274/0x11c0 drivers/hid/hid-core.c:2022 __hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2085 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: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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:to_info kernel/printk/printk_ringbuffer.c:370 [inline] RIP: 0010:prb_read kernel/printk/printk_ringbuffer.c:1911 [inline] RIP: 0010:_prb_read_valid+0x148/0x7e0 kernel/printk/printk_ringbuffer.c:2113 Code: 89 e1 44 89 e6 d3 e0 8d 68 ff e8 23 71 1e 00 4c 21 f5 48 6b dd 58 41 83 fc 1f 0f 87 92 f4 aa 05 e8 cd 6e 1e 00 48 8b 44 24 28 <80> 38 00 0f 85 f2 05 00 00 49 03 5d 10 e8 b6 6e 1e 00 48 8b 44 24 RSP: 0018:ffffc9000188fa48 EFLAGS: 00000293 RAX: fffffbfff11b91da RBX: 0000000000007d20 RCX: ffffffff813624ad RDX: ffff888115bc8000 RSI: ffffffff813624c3 RDI: 0000000000000005 RBP: 000000000000016c R08: 0000000000000005 R09: 000000000000001f R10: 000000000000000d R11: 0000000000000000 R12: 000000000000000d R13: ffffffff88dc8ec0 R14: 000000000001216c R15: ffffc9000188fb18 prb_read_valid+0x79/0xb0 kernel/printk/printk_ringbuffer.c:2182 syslog_print+0x1ae/0x5d0 kernel/printk/printk.c:1582 do_syslog+0x3be/0x6a0 kernel/printk/printk.c:1734 __do_sys_syslog kernel/printk/printk.c:1826 [inline] __se_sys_syslog kernel/printk/printk.c:1824 [inline] __x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1824 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: 0033:0x7f4e071e1fa7 Code: 73 01 c3 48 8b 0d 81 ce 0c 00 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 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 ce 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffed5ed4848 EFLAGS: 00000206 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 00007f4e073804a0 RCX: 00007f4e071e1fa7 RDX: 00000000000003ff RSI: 00007f4e073804a0 RDI: 0000000000000002 RBP: 0000000000000000 R08: 0000000000000007 R09: 916206b56c55b023 R10: 0000000000004000 R11: 0000000000000206 R12: 00007f4e073804a0 R13: 00007f4e07370212 R14: 00007f4e073804f2 R15: 00007f4e073804f2 Showing all locks held in the system: 5 locks held by kworker/0:1/9: #0: ffff88810668b548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc9000009fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff888109fa1190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #2: ffff888109fa1190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff888113fd1190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #3: ffff888113fd1190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1004 #4: ffff888113fd7160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff888113fd7160 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1004 4 locks held by klogd/2535: #0: ffff8881239d7230 (&dev->event_lock){..-.}-{2:2}, at: input_event drivers/input/input.c:397 [inline] #0: ffff8881239d7230 (&dev->event_lock){..-.}-{2:2}, at: input_event+0x70/0xa0 drivers/input/input.c:390 #1: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #1: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #1: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: input_pass_values+0x8b/0x8e0 drivers/input/input.c:118 #2: ffffffff8935c7b8 (kbd_event_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffffff8935c7b8 (kbd_event_lock){..-.}-{2:2}, at: kbd_event+0x8a/0x17a0 drivers/tty/vt/keyboard.c:1535 #3: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #3: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #3: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 2 locks held by getty/2605: #0: ffff8881141f80a0 (&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 6 locks held by kworker/1:5/4931: #0: ffff88810668b548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc9000dccfd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff888109fd0190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #2: ffff888109fd0190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff888105ab0190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #3: ffff888105ab0190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295 #4: ffff888105ab5160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff888105ab5160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff888105ab5160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1292 #5: ffffffff89bab988 (input_mutex){+.+.}-{3:3}, at: __input_unregister_device+0x136/0x450 drivers/input/input.c:2275 6 locks held by kworker/1:2/13112: #0: ffff88810668b548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc90011547d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff888109f33190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #2: ffff888109f33190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff88811a68d190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #3: ffff88811a68d190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295 #4: ffff888113fd2160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff888113fd2160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff888113fd2160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1292 #5: ffff888116dd5a20 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #5: ffff888116dd5a20 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #5: ffff888116dd5a20 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1292 1 lock held by syz.4.3998/21620: #0: ffffffff88ec6df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:296 1 lock held by syz.1.4001/21609: #0: ffffffff88ec6df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:328 ============================================= keytouch 0003:0926:3333.0254: can't resubmit intr, dummy_hcd.0-1/input0, status -19