rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P20864/1:b..l rcu: (detected by 0, t=10502 jiffies, g=120525, q=1708 ncpus=2) task:syz.7.3384 state:R running task stack:22680 pid:20864 tgid:20858 ppid:20135 task_flags:0x40054c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7409 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190 spin_unlock include/linux/spinlock.h:390 [inline] zap_pte_range mm/memory.c:1964 [inline] zap_pmd_range mm/memory.c:2020 [inline] zap_pud_range mm/memory.c:2048 [inline] zap_p4d_range mm/memory.c:2069 [inline] __zap_vma_range+0x4084/0x4f10 mm/memory.c:2109 unmap_vmas+0x390/0x550 mm/memory.c:2178 exit_mmap+0x293/0x9f0 mm/mmap.c:1300 __mmput+0x118/0x420 kernel/fork.c:1182 exit_mm+0x221/0x2d0 kernel/exit.c:610 do_exit+0x6cd/0x2360 kernel/exit.c:992 do_group_exit+0x22d/0x2f0 kernel/exit.c:1147 get_signal+0x121b/0x12c0 kernel/signal.c:3038 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x104/0x730 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f225219ce59 RSP: 002b:00007f2252f89028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f2252416180 RCX: 00007f225219ce59 RDX: 00002000000002c0 RSI: 0000000000004c0a RDI: 0000000000000008 RBP: 00007f2252232e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2252416218 R14: 00007f2252416180 R15: 00007ffeb1fce0b8 rcu: rcu_preempt kthread starved for 10402 jiffies! g120525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:28120 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 __schedule_loop kernel/sched/core.c:7307 [inline] schedule+0x164/0x360 kernel/sched/core.c:7322 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 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 0 to CPUs 1: usb 1-1: pegasus_irq - nonzero urb status received: -71 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4978 Comm: klogd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:vsnprintf+0x18a/0xef0 lib/vsprintf.c:2905 Code: 8b 44 24 10 42 0f b6 04 30 84 c0 0f 85 12 0a 00 00 48 8b 04 24 8b 18 bf 29 00 00 00 89 de e8 1d bb 1b f6 41 81 fd 01 04 00 00 <0f> 82 10 05 00 00 83 fb 28 4c 8b 6c 24 28 0f 87 69 06 00 00 e8 bd RSP: 0018:ffffc90000a07f48 EFLAGS: 00000016 RAX: ffffffff8baa7a13 RBX: 0000000000000010 RCX: 0000000000000002 RDX: ffff88807f03be00 RSI: 0000000000000010 RDI: 0000000000000029 RBP: ffffc90080a0821f R08: ffff88807f03be00 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000002 R12: ffffc90000a08221 R13: 0000000000000800 R14: dffffc0000000000 R15: ffffffff8bcd9005 FS: 00007fb2b15a6c80(0000) GS:ffff888125351000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000bd038 CR3: 0000000024a89000 CR4: 0000000000350ef0 Call Trace: sprintf+0xe7/0x140 lib/vsprintf.c:3112 print_time kernel/printk/printk.c:1359 [inline] info_print_prefix+0x16b/0x360 kernel/printk/printk.c:1385 record_print_text+0x181/0x4b0 kernel/printk/printk.c:1434 printk_get_next_message+0x297/0x880 kernel/printk/printk.c:3072 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x4e3/0xaf0 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479 dev_vprintk_emit+0x338/0x400 drivers/base/core.c:4996 dev_printk_emit+0xee/0x140 drivers/base/core.c:5007 _dev_err+0x11e/0x180 drivers/base/core.c:5062 pegasus_irq+0x483/0x5a0 drivers/input/tablet/pegasus_notetaker.c:195 __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1655 dummy_timer+0xac3/0x4b40 drivers/usb/gadget/udc/dummy_hcd.c:2005 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:memset+0xf/0x30 arch/x86/lib/memset_64.S:38 Code: 44 88 1f e9 8e 84 61 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 e9 62 84 61 f5 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90004e3f9b8 EFLAGS: 00000202 RAX: 1ffff920009c7f00 RBX: ffffffff8e845e58 RCX: 0000000000000017 RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffffc90004e3faa1 RBP: ffffc90004e3fb40 R08: ffffc90004e3fab7 R09: ffffc90004e3faa0 R10: dffffc0000000000 R11: fffff520009c7f57 R12: dffffc0000000000 R13: 0000000000006c15 R14: ffffffff8e86fc68 R15: ffffffff8e833c60 prb_read kernel/printk/printk_ringbuffer.c:1974 [inline] _prb_read_valid+0x227/0xa50 kernel/printk/printk_ringbuffer.c:2173 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2245 syslog_print+0x24b/0x610 kernel/printk/printk.c:1612 do_syslog+0x583/0x7d0 kernel/printk/printk.c:1763 __do_sys_syslog kernel/printk/printk.c:1855 [inline] __se_sys_syslog kernel/printk/printk.c:1853 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1853 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb2b1770a37 Code: 73 01 c3 48 8b 0d c1 f3 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 91 f3 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffed6a201e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 00007fb2b1910490 RCX: 00007fb2b1770a37 RDX: 00000000000003ff RSI: 00007fb2b1910490 RDI: 0000000000000002 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000206 R12: 00007fb2b1910490 R13: 00007fb2b18eddfe R14: 00007fb2b1910586 R15: 00007fb2b1910586 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - urb shutting down with status: -2 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - nonzero urb status received: -71 usb 1-1: pegasus_irq - urb shutting down with status: -2