rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=125053, q=1189 ncpus=1)
rcu: All QSes seen, last rcu_preempt kthread activity 7603 (4295007152-4294999549), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 7603 jiffies! g125053 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
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:
CPU: 0 UID: 0 PID: 11396 Comm: kworker/R-wg-cr Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 2d ed cf f5 f7 c3 00 02 00 00 74 05 e8 d0 cc fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 00 c1 f5 65 8b 05 bd 40 99 07 85 c0 74 18 5b 41 5e e9 8c d1
RSP: 0018:ffffc90000007b08 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000101
RDX: 0000000000000002 RSI: ffffffff8e228abd RDI: 0000000000000001
RBP: ffffc90000007e10 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff888028700000 R15: ffff888029f95410
FS: 0000000000000000(0000) GS:ffff888124f55000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b7d9ee000 CR3: 0000000022b3c000 CR4: 0000000000350ef0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
dummy_timer+0x497b/0x4cf0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__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:process_one_work kernel/workqueue.c:3327 [inline]
RIP: 0010:process_scheduled_works+0xa98/0x14e0 kernel/workqueue.c:3405
Code: 48 8b 4c 24 48 80 3c 01 00 74 08 4c 89 e7 e8 df 6c a5 00 4d 8b 1c 24 4c 89 ff 2e e8 22 7e 44 0a 48 b8 00 00 00 00 00 fc ff df <48> 8b 4c 24 48 80 3c 01 00 74 08 4c 89 e7 e8 b5 6c a5 00 49 8b 34
RSP: 0018:ffffc90002ebfae0 EFLAGS: 00000282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880292cdd00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807eed27c8
RBP: ffffc90002ebfce0 R08: ffff88807eed2ea3 R09: 1ffff1100fdda5d4
R10: dffffc0000000000 R11: ffffed100fdda5d5 R12: ffff88802bd36718
R13: dffffc0000000000 R14: ffffffff818f2f90 R15: ffff88807eed2b90
rescuer_thread+0x7b6/0x10b0 kernel/workqueue.c:3629
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