rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P26601/1:b..l rcu: (detected by 1, t=10502 jiffies, g=168709, q=1561 ncpus=2) task:syz.5.5128 state:R running task stack:23192 pid:26601 tgid:26601 ppid:22981 task_flags:0x40064c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0xfee/0x6120 kernel/sched/core.c:6911 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7238 irqentry_exit+0x17b/0x670 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:81 [inline] RIP: 0010:__orc_find+0x70/0xf0 arch/x86/kernel/unwind_orc.c:103 Code: ec 72 4e 4c 89 e2 48 29 ea 48 89 d6 48 c1 ea 3f 48 c1 fe 02 48 01 f2 48 d1 fa 48 8d 5c 95 00 48 89 da 48 c1 ea 03 0f b6 34 0a <48> 89 da 83 e2 07 83 c2 03 40 38 f2 7c 05 40 84 f6 75 4b 48 63 13 RSP: 0018:ffffc9001029ef00 EFLAGS: 00000a06 RAX: ffffffff91882d76 RBX: ffffffff90fc44a8 RCX: dffffc0000000000 RDX: 1ffffffff21f8895 RSI: 0000000000000000 RDI: ffffffff90fc4490 RBP: ffffffff90fc44a4 R08: ffffffff91882dac R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000018088 R12: ffffffff90fc44b0 R13: ffffffff828088c1 R14: ffffffff90fc4490 R15: ffffffff90fc44a0 orc_find arch/x86/kernel/unwind_orc.c:238 [inline] unwind_next_frame+0x2ec/0x1ea0 arch/x86/kernel/unwind_orc.c:510 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x162/0x1e0 mm/page_owner.c:165 __reset_page_owner+0x84/0x190 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xaea/0x1790 mm/page_alloc.c:3040 folios_put_refs+0x53c/0x840 mm/swap.c:1002 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x39e/0xbd0 mm/shmem.c:1407 evict+0x3c2/0xad0 fs/inode.c:846 iput_final fs/inode.c:1966 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2015 iput+0x35/0x40 fs/inode.c:1981 dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467 __dentry_kill+0x1d0/0x600 fs/dcache.c:670 finish_dput+0x76/0x480 fs/dcache.c:879 dput.part.0+0x456/0x570 fs/dcache.c:928 dput+0x1f/0x30 fs/dcache.c:920 __fput+0x519/0xb40 fs/file_table.c:477 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x8b8/0x2b60 kernel/exit.c:976 do_group_exit+0xd5/0x2a0 kernel/exit.c:1118 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x1f8/0x670 kernel/entry/common.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f333499c819 RSP: 002b:00007f3335869fd8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 00007f3334c16180 RCX: 00007f333499c819 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 00007f3334a32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f3334c16218 R14: 00007f3334c16180 R15: 00007fff96c41278 rcu: rcu_preempt kthread starved for 10212 jiffies! g168709 f0x0 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:29048 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0xfee/0x6120 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7008 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 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 1 to CPUs 0: usb 10-1: pegasus_irq - nonzero urb status received: -71 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5881 Comm: kworker/0:5 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_power_efficient wg_ratelimiter_gc_entries RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:417 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 e9 eb be e1 f5 cc RSP: 0018:ffffc90000006f00 EFLAGS: 00000087 RAX: 000000000003943a RBX: 0000000000000001 RCX: ffffc900021e1000 RDX: 0000000000040000 RSI: ffffffff8b8d1d77 RDI: ffff8880575b24c0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000002627d8 R12: 00000000000006de R13: ffffc90080007337 R14: 0000000000000004 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff888124339000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb4a115cf5b CR3: 000000002a7aa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: number+0x5f7/0xc90 lib/vsprintf.c:529 vsnprintf+0x30e/0x1240 lib/vsprintf.c:2912 sprintf+0xcc/0x100 lib/vsprintf.c:3111 print_time kernel/printk/printk.c:1359 [inline] info_print_prefix+0x25a/0x350 kernel/printk/printk.c:1385 record_print_text+0x143/0x3c0 kernel/printk/printk.c:1434 printk_get_next_message+0x2d1/0x6c0 kernel/printk/printk.c:3072 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record+0x67c/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 dev_vprintk_emit+0x394/0x3e0 drivers/base/core.c:4915 dev_printk_emit+0xd2/0x10d drivers/base/core.c:4926 __dev_printk+0xcb/0x100 drivers/base/core.c:4938 _dev_err+0xef/0x127 drivers/base/core.c:4981 pegasus_irq+0x584/0x5c0 drivers/input/tablet/pegasus_notetaker.c:198 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866 handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5872 Code: 05 fb 65 29 12 83 f8 07 0f 87 f0 00 00 00 48 0f a3 05 c6 c5 f4 0e 0f 82 c2 02 00 00 8b 35 ae f9 f4 0e 85 f6 0f 85 dd 00 00 00 <48> 8b 44 24 30 65 48 2b 05 9d 65 29 12 0f 85 02 03 00 00 48 83 c4 RSP: 0018:ffffc900051ffb78 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8de5457c RDI: ffffffff8c1b1e20 RBP: ffffffff8f94ef18 R08: 000000004f8b7b27 R09: 00000000000007ce R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:341 [inline] wg_ratelimiter_gc_entries+0x62/0x510 drivers/net/wireguard/ratelimiter.c:63 process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276 process_scheduled_works kernel/workqueue.c:3359 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - urb shutting down with status: -2 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - nonzero urb status received: -71 usb 10-1: pegasus_irq - usb_submit_urb failed with result -19