rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=15945, q=369 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 9616 (4294963132-4294953516), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 9616 jiffies! g15945 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27368 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7058 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: usb 2-1: pegasus_irq - nonzero urb status received: -71 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:info_print_prefix+0x40/0x350 kernel/printk/printk.c:1400 Code: 41 54 55 48 89 fd 53 48 89 cb 49 89 df 48 83 ec 70 4c 8d 64 24 10 88 14 24 49 c1 ec 03 89 74 24 0c 48 c7 44 24 10 b3 8a b5 41 <49> 8d 14 04 48 c7 44 24 18 df bb e2 8d 48 c7 44 24 20 40 15 9a 81 RSP: 0018:ffffc900000072c0 EFLAGS: 00000806 RAX: dffffc0000000000 RBX: ffffc900000073d0 RCX: ffffc900000073d0 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc90000007500 RBP: ffffc90000007500 R08: ffffc900000073d0 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000f1ec8 R12: 1ffff92000000e5a R13: 0000000000000001 R14: 0000000000000000 R15: ffffc900000073d0 FS: 0000000000000000(0000) GS:ffff8881246b9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558aa49808 CR3: 00000000323d1000 CR4: 00000000003526f0 Call Trace: record_print_text+0x140/0x400 kernel/printk/printk.c:1456 printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3024 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x6ea/0xc60 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3325 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_err+0xe4/0x120 drivers/base/core.c:4980 pegasus_irq+0xe3/0x630 drivers/input/tablet/pegasus_notetaker.c:195 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82 Code: 4c 62 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 52 16 00 fb f4 4c 09 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c2 RAX: 00000000004ef02b RBX: 0000000000000000 RCX: ffffffff8b93bc29 RDX: 0000000000000000 RSI: ffffffff8de50210 RDI: ffffffff8c162900 RBP: fffffbfff1c52ef8 R08: 0000000000000001 R09: ffffed1017086655 R10: ffff8880b84332ab R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8e2977c0 R14: ffffffff90ab4b90 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:757 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x391/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428 rest_init+0x16b/0x2b0 init/main.c:744 start_kernel+0x3ee/0x4d0 init/main.c:1097 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x148 vkms_vblank_simulate: vblank timer overrun usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - nonzero urb status received: -71 usb 2-1: pegasus_irq - usb_submit_urb failed with result -1