rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11250/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=132153, q=641 ncpus=1)
task:syz-executor state:R running task stack:23032 pid:11250 tgid:11250 ppid:11249 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x19e/0x310 kernel/locking/lockdep.c:5968
Code: ff 65 0f c1 05 1b e8 a6 13 83 f8 01 0f 85 27 01 00 00 9c 58 f6 c4 02 0f 85 12 01 00 00 41 f7 c6 00 02 00 00 0f 85 c8 00 00 00 <48> 8b 44 24 10 65 48 2b 05 5d 9e a6 13 0f 85 4d 01 00 00 48 83 c4
RSP: 0018:ffffc900050ff5d8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8fdecde0 RCX: ffffc900050ff5e4
RDX: 0000000000000000 RSI: ffffffff8e3bfab7 RDI: ffffffff8c625e80
RBP: ffffffff81ba3dee R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000018161 R12: ffff88802858a580
R13: ffffc900050ff690 R14: 0000000000000202 R15: 0000000000000005
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x3c3/0x2090 arch/x86/kernel/unwind_orc.c:495
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:183
__reset_page_owner+0x84/0x190 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_noprof+0x2cc/0x840 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
tomoyo_realpath_from_path+0xb6/0x690 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x276/0x460 security/tomoyo/file.c:827
tomoyo_path_unlink+0x91/0xe0 security/tomoyo/tomoyo.c:162
security_path_unlink+0x145/0x2b0 security/security.c:1483
filename_unlinkat+0x316/0x730 fs/namei.c:5726
__do_sys_unlink fs/namei.c:5764 [inline]
__se_sys_unlink fs/namei.c:5761 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5761
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb007b9e647
RSP: 002b:00007fff60a453b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb007b9e647
RDX: 00007fff60a453e0 RSI: 00007fff60a45470 RDI: 00007fff60a45470
RBP: 00007fff60a45470 R08: 00007fff60a46470 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff60a46500
R13: 00007fb007c35f63 R14: 000000000017d16e R15: 00007fff60a46540
rcu: rcu_preempt kthread starved for 531 jiffies! g132153 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27400 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x930 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x179/0x260 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 43 Comm: kworker/u8:2 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:dev_hard_start_xmit+0x298/0x760 net/core/dev.c:3965
Code: 04 00 00 48 8b 04 24 31 ff 48 8b 98 90 01 00 00 83 e3 01 89 de e8 58 d0 69 f8 84 db 0f 85 d3 03 00 00 4c 89 fb e8 38 d6 69 f8 <48> 85 db 0f 84 3d 03 00 00 e8 2a d6 69 f8 48 89 d8 48 c1 e8 03 42
RSP: 0018:ffffc90000006fc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000301
RDX: ffff888021284b00 RSI: ffffffff89a321f8 RDI: ffff888021284b00
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000763b R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88802b780000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888122934000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555740f34e8 CR3: 000000000fb98000 CR4: 00000000003526f0
Call Trace:
__dev_queue_xmit+0x1c25/0x4a40 net/core/dev.c:4958
dev_queue_xmit include/linux/netdevice.h:3464 [inline]
br_dev_queue_push_xmit+0x361/0x530 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:325 [inline]
NF_HOOK include/linux/netfilter.h:319 [inline]
br_forward_finish+0x102/0x4d0 net/bridge/br_forward.c:66
br_nf_hook_thresh+0x30d/0x420 net/bridge/br_netfilter_hooks.c:1165
br_nf_forward_finish+0x693/0xb30 net/bridge/br_netfilter_hooks.c:667
NF_HOOK include/linux/netfilter.h:325 [inline]
NF_HOOK include/linux/netfilter.h:319 [inline]
br_nf_forward_arp net/bridge/br_netfilter_hooks.c:757 [inline]
br_nf_forward+0x157a/0x19f0 net/bridge/br_netfilter_hooks.c:780
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xbf/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK include/linux/netfilter.h:323 [inline]
__br_forward+0x2f7/0x970 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xf0/0x180 net/bridge/br_forward.c:191
br_flood+0x29b/0x7b0 net/bridge/br_forward.c:245
br_handle_frame_finish+0xfe2/0x1f70 net/bridge/br_input.c:229
nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
br_handle_frame+0x7db/0x1670 net/bridge/br_input.c:451
__netif_receive_skb_core.constprop.0+0x6c5/0x3530 net/core/dev.c:6184
__netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6295
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6410
process_backlog+0x487/0x1600 net/core/dev.c:6761
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7830
napi_poll net/core/dev.c:7893 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:8050
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
do_softirq kernel/softirq.c:546 [inline]
do_softirq+0xaf/0xf0 kernel/softirq.c:533
__local_bh_enable_ip+0xff/0x120 kernel/softirq.c:473
local_bh_enable include/linux/bottom_half.h:33 [inline]
fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
kernel_fpu_end arch/x86/kernel/fpu/core.c:527 [inline]
kernel_fpu_end+0x64/0x80 arch/x86/kernel/fpu/core.c:520
blake2s_compress+0x78/0xf0 lib/crypto/x86/blake2s.h:42
blake2s_final+0xc9/0x160 lib/crypto/blake2s.c:142
blake2s.constprop.0+0x181/0x210 include/crypto/blake2s.h:157
compute_mac1 drivers/net/wireguard/cookie.c:80 [inline]
wg_cookie_add_mac_to_packet+0x51/0x1c0 drivers/net/wireguard/cookie.c:163
wg_packet_send_handshake_initiation+0x1c6/0x360 drivers/net/wireguard/send.c:35
wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245