rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2642 jiffies s: 63585 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: 800 Comm: kworker/0:2 Not tainted 6.12.0-rc1-syzkaller-00027-g4a9fe2a8ac53 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_power_efficient gc_worker RIP: 0010:_prb_read_valid+0x70e/0x7e0 kernel/printk/printk_ringbuffer.c:2149 Code: e9 00 00 00 48 81 c4 30 01 00 00 89 d8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 4c 8b 64 24 48 31 db eb 9d 4c 8b 64 24 48 91 48 89 ef e8 f8 4f 77 00 e9 03 fe ff ff bb 01 00 00 00 e9 e3 RSP: 0018:ffffc90000006ec8 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff8137111e RDX: ffff88810b321d40 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffffffff934685a0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000007307b8 R12: 1ffff92000000de7 R13: ffffffff88dc84a0 R14: 000000000001c45b R15: ffffc90000006f98 FS: 0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a52bc7a8c CR3: 000000011ee70000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: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:1736 hid_report_raw_event+0x274/0x11c0 drivers/hid/hid-core.c:2047 __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:__seqprop_spinlock_sequence include/linux/seqlock.h:227 [inline] RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:345 [inline] RIP: 0010:gc_worker+0x2e1/0x1760 net/netfilter/nf_conntrack_core.c:1534 Code: 00 00 48 c7 c7 c8 85 56 8a e8 ab ae 2f fb 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 d9 4e 52 fb 48 85 db 58 0f 85 3d 10 00 00 5a 4c 52 fb eb 07 e8 53 4c 52 fb f3 90 44 8b 35 ea ec 52 04 44 RSP: 0018:ffffc90001d8fbc8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8603a47a RDX: ffff88810b321d40 RSI: ffffffff8603a489 RDI: 0000000000000007 RBP: ffff888111000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000010033 R13: dffffc0000000000 R14: 0000000000020065 R15: 0000000000040000 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:kworker/u8:7 state:R running task stack:32568 pid:27840 tgid:27840 ppid:25723 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6675 do_task_dead+0xd6/0x110 kernel/sched/core.c:6691 do_exit+0x1de7/0x2ce0 kernel/exit.c:990 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097 x64_sys_call+0x14a9/0x16a0 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: 0033:0x7f981a756a90 RSP: 002b:00007ffc91e5d4b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f981a847860 RCX: 00007f981a756a90 RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00007f981a847860 R08: 0000000000000001 R09: 24feaff4ab8ca1a2 R10: 00007ffc91e5d370 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f981a84b658 R15: 0000000000000001 Showing all locks held in the system: 7 locks held by kworker/0:2/800: #0: ffff888100081948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90001d8fd80 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #2: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: gc_worker+0x247/0x1760 net/netfilter/nf_conntrack_core.c:1532 #3: ffff88811f9d9230 (&dev->event_lock){..-.}-{2:2}, at: input_event drivers/input/input.c:397 [inline] #3: ffff88811f9d9230 (&dev->event_lock){..-.}-{2:2}, at: input_event+0x70/0xa0 drivers/input/input.c:390 #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: input_pass_values+0x8b/0x8e0 drivers/input/input.c:118 #5: ffffffff89387ad8 (kbd_event_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #5: ffffffff89387ad8 (kbd_event_lock){..-.}-{2:2}, at: kbd_event+0x8a/0x17a0 drivers/tty/vt/keyboard.c:1535 #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: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 2 locks held by getty/2606: #0: ffff88810fb230a0 (&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 1 lock held by syz.3.4260/27291: #0: ffffffff88ec6a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297 1 lock held by syz.0.4264/27294: #0: ffffffff88ec6a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 =============================================