rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12163/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=34629, q=520900 ncpus=2)
task:syz.2.2531 state:R running task stack:24960 pid:12163 tgid:12162 ppid:5821 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:851 [inline]
RIP: 0010:__page_table_check_zero+0xa6/0x3e0 mm/page_table_check.c:138
Code: c0 45 31 c9 41 54 e8 a9 54 65 ff 48 83 c4 08 e8 80 40 73 09 89 c3 31 ff 89 c6 e8 85 81 89 ff 85 db 74 10 e8 ac 8a 6e ff 84 c0 <74> 0e e8 33 7d 89 ff eb 56 e8 2c 7d 89 ff eb 4f e8 55 40 73 09 89
RSP: 0018:ffffc9000d91f478 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000080000001
RDX: ffff8880300b8000 RSI: ffffffff8c27d0e0 RDI: ffffffff8c27d0a0
RBP: dffffc0000000000 R08: ffffffff823c375a R09: ffffffff8e75e5e0
R10: dffffc0000000000 R11: ffffed1006cfd624 R12: ffffffff823c375a
R13: ffffea0001b7ca00 R14: 1ffffffff1c355d9 R15: 0000000000000000
page_table_check_alloc include/linux/page_table_check.h:38 [inline]
post_alloc_hook+0x240/0x280 mm/page_alloc.c:1890
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2490
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2509
shmem_alloc_folio mm/shmem.c:1930 [inline]
shmem_alloc_and_add_folio+0x445/0xf80 mm/shmem.c:1972
shmem_get_folio_gfp+0x5a9/0x1670 mm/shmem.c:2567
shmem_get_folio mm/shmem.c:2673 [inline]
shmem_write_begin+0x16c/0x330 mm/shmem.c:3327
generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3502
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61d/0xb90 fs/read_write.c:688
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feec9b5d04e
RSP: 002b:00007feecaa29da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007feecaa2a6c0 RCX: 00007feec9b5d04e
RDX: 00000000013bd7ef RSI: 00007feebf800000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007feecaa29ee0 R14: 00007feecaa29ea0 R15: 00007feebf800000
rcu: rcu_preempt kthread starved for 5742 jiffies! g34629 f0x2 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:27656 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 1 UID: 0 PID: 11120 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 03/18/2026
Workqueue: wg-crypt-wg2 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:194
Code: f7 e8 dd 21 f0 f5 f7 c3 00 02 00 00 74 05 e8 70 8d 1b f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 a4 de e1 f5 65 8b 05 0d 80 6a 07 85 c0 74 18 5b 41 5e e9 dc 30
RSP: 0018:ffffc90000a08a88 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000101
RDX: 0000000000000002 RSI: ffffffff8defaba4 RDI: 0000000000000001
RBP: ffffc90000a08d70 R08: ffffffff9011ceb7 R09: 1ffffffff20239d6
R10: dffffc0000000000 R11: fffffbfff20239d7 R12: dffffc0000000000
R13: 000000000000d000 R14: ffff888029250000 R15: ffff8880294d1470
FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555578e614e8 CR3: 000000003295c000 CR4: 0000000000350ef0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
dummy_timer+0x44a2/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:wg_noise_keypair_put+0x4/0x290 drivers/net/wireguard/noise.c:132
Code: 38 c1 7c d2 48 89 df e8 aa 18 bf fb eb c8 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 <55> 41 57 41 56 41 55 41 54 53 89 f5 48 89 fb e8 98 ca 54 fb 48 85
RSP: 0018:ffffc9000ebc7a20 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88805557e000
RBP: dffffc0000000000 R08: ffffffff9011ceb7 R09: 1ffffffff20239d6
R10: dffffc0000000000 R11: fffffbfff20239d7 R12: ffff888054e1b1a0
R13: 1000000000000000 R14: ffffffff8671d1ca R15: ffff888054e1b188
wg_packet_tx_worker+0x592/0x7c0 drivers/net/wireguard/send.c:280
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
rescuer_thread+0x827/0x1130 kernel/workqueue.c:3583
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245