rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2640 jiffies s: 97369 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: 31162 Comm: kworker/u8:4 Not tainted 6.12.0-rc1-syzkaller-00028-gd73dc7b182be #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:__sanitizer_cov_trace_pc+0x66/0x70 kernel/kcov.c:235 Code: 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 cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000006cc8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffc90000006df8 RCX: 0000000000000012 RDX: ffff8881234f0000 RSI: ffffffff81370515 RDI: ffffffff88dc84d8 RBP: ffffffff9349acf8 R08: 0000000000000005 R09: 000000000000003f R10: 0000000000000012 R11: 0000000000000000 R12: 0000000000000028 R13: ffffffff88dc84d0 R14: ffffc90000006dc0 R15: ffffc90000006e00 FS: 0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200012b8 CR3: 0000000115c14000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_data+0x2b5/0x550 kernel/printk/printk_ringbuffer.c:1240 copy_data kernel/printk/printk_ringbuffer.c:1827 [inline] prb_read kernel/printk/printk_ringbuffer.c:1936 [inline] _prb_read_valid+0x33e/0x7e0 kernel/printk/printk_ringbuffer.c:2113 prb_read_valid+0x79/0xb0 kernel/printk/printk_ringbuffer.c:2182 printk_get_next_message+0x158/0x670 kernel/printk/printk.c:2963 console_emit_next_record kernel/printk/printk.c:3046 [inline] console_flush_all+0x6ec/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:7582 [inline] sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7557 show_state_filter+0xee/0x320 kernel/sched/core.c:7627 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 26 91 42 fa 48 89 df e8 3e 0e 43 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 f5 50 37 fa 65 8b 05 b6 0d 13 79 85 c0 74 16 5b RSP: 0018:ffffc9000b1e6828 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff9350fa70 RCX: 1ffffffff1f5ba74 RDX: 0000000000000000 RSI: ffffffff8727f1c0 RDI: ffffffff8746eac0 RBP: 0000000000000202 R08: 0000000000000001 R09: fffffbfff1f55dc2 R10: ffffffff8faaee17 R11: 0000000000000000 R12: 1ffff9200163cd0c R13: ffff8881063aebe0 R14: 0000000000000001 R15: ffffffff9350fa70 __debug_object_init+0x34a/0x480 lib/debugobjects.c:645 debug_timer_init kernel/time/timer.c:831 [inline] debug_init kernel/time/timer.c:879 [inline] init_timer_key+0x2f/0x60 kernel/time/timer.c:923 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1635 [inline] scsi_queue_rq+0x1887/0x3360 drivers/scsi/scsi_lib.c:1825 blk_mq_dispatch_rq_list+0x440/0x1e20 block/blk-mq.c:2030 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xd4/0x150 block/blk-mq-sched.c:331 blk_mq_run_hw_queue+0x645/0x9a0 block/blk-mq.c:2243 blk_mq_dispatch_plug_list block/blk-mq.c:2747 [inline] blk_mq_flush_plug_list+0x5df/0x1be0 block/blk-mq.c:2798 blk_add_rq_to_plug+0x1de/0x4d0 block/blk-mq.c:1290 blk_mq_submit_bio+0x15dd/0x2420 block/blk-mq.c:3031 __submit_bio+0x187/0x450 block/blk-core.c:615 __submit_bio_noacct_mq block/blk-core.c:696 [inline] submit_bio_noacct_nocheck+0x6fb/0xd70 block/blk-core.c:725 submit_bio_noacct+0x506/0x13a0 block/blk-core.c:854 ext4_io_submit+0xa6/0x140 fs/ext4/page-io.c:377 ext4_do_writepages+0x1090/0x3440 fs/ext4/inode.c:2744 ext4_writepages+0x303/0x730 fs/ext4/inode.c:2813 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2683 __writeback_single_inode+0x166/0xfa0 fs/fs-writeback.c:1658 writeback_sb_inodes+0x603/0xfa0 fs/fs-writeback.c:1954 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2025 wb_writeback+0x721/0xb50 fs/fs-writeback.c:2136 wb_check_old_data_flush fs/fs-writeback.c:2240 [inline] wb_do_writeback fs/fs-writeback.c:2293 [inline] wb_workfn+0x8c3/0xbc0 fs/fs-writeback.c:2321 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 Showing all locks held in the system: 2 locks held by getty/2607: #0: ffff88810fb640a0 (&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 4 locks held by kworker/1:7/15064: 9 locks held by kworker/u8:4/31162: #0: ffff888102abe148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc9000b1e7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888113ed20e0 (&type->s_umount_key#47){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562 #3: ffff888113ed4b90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2683 #4: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #4: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #4: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: blk_mq_run_hw_queue+0x619/0x9a0 block/blk-mq.c:2243 #5: ffff88811d9d8230 (&dev->event_lock){..-.}-{2:2}, at: input_event drivers/input/input.c:397 [inline] #5: ffff88811d9d8230 (&dev->event_lock){..-.}-{2:2}, at: input_event+0x70/0xa0 drivers/input/input.c:390 #6: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #6: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #6: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: input_pass_values+0x8b/0x8e0 drivers/input/input.c:118 #7: ffffffff89387ad8 (kbd_event_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #7: ffffffff89387ad8 (kbd_event_lock){..-.}-{2:2}, at: kbd_event+0x8a/0x17a0 drivers/tty/vt/keyboard.c:1535 #8: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #8: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #8: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 6 locks held by kworker/1:0/7642: #0: ffff888105adf548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc9000290fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888109bd1190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff888109bd1190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff8881275b9190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff8881275b9190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295 #4: ffff888124f1c160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff888124f1c160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff888124f1c160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 #5: ffff88810c7d9a20 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #5: ffff88810c7d9a20 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #5: ffff88810c7d9a20 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 1 lock held by syz.0.6558/7761: #0: ffffffff88ec6a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 1 lock held by syz.1.6562/7771: #0: ffffffff88ec6a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 ============================================= keytouch 0003:0926:3333.03E2: can't resubmit intr, dummy_hcd.0-1/input0, status -19