rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14058/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=40261, q=1388 ncpus=2)
task:syz-executor state:R running task stack:27848 pid:14058 tgid:14058 ppid:8086 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_lock_release include/linux/rcupdate.h:341 [inline]
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:897 [inline]
RIP: 0010:is_bpf_text_address+0x288/0x2b0 kernel/bpf/core.c:746
Code: c2 20 fb 70 8b e8 98 76 ce ff 48 85 db 0f 95 c0 48 81 fb 20 02 00 00 40 0f 95 c5 40 20 c5 48 c7 c7 20 d3 13 8e 48 8b 74 24 08 63 5c ce ff e8 4e 01 d8 ff 89 e8 48 83 c4 10 5b 41 5c 41 5d 41
RSP: 0018:ffffc90002f47550 EFLAGS: 00000246
RAX: ffffffff81ce9600 RBX: 0000000000000000 RCX: ffff888032285ac0
RDX: 0000000000000000 RSI: ffffffff81ce9426 RDI: ffffffff8e13d320
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ce9426
R10: ffffc90002f47638 R11: ffffffff81abbce0 R12: 00000000000007ca
R13: dffffc0000000000 R14: 00007f4b95f8d8dc R15: 0000000000000000
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2515 [inline]
slab_free mm/slub.c:6574 [inline]
kmem_cache_free+0x19b/0x690 mm/slub.c:6684
skb_release_all net/core/skbuff.c:1150 [inline]
__kfree_skb net/core/skbuff.c:1166 [inline]
consume_skb+0x60/0xf0 net/core/skbuff.c:1398
tun_do_read+0x1c23/0x28f0 drivers/net/tun.c:2188
tun_chr_read_iter+0x13b/0x260 drivers/net/tun.c:2208
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0x557/0xa30 fs/read_write.c:572
ksys_read+0x145/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b95f8d8dc
RSP: 002b:00007fff076427e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fff07642810 RCX: 00007f4b95f8d8dc
RDX: 00000000000003e8 RSI: 00007fff07642810 RDI: 00000000000000c8
RBP: 00007fff07642c4c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000012d
R13: 00000000000927c0 R14: 000000000003e48b R15: 00007fff07642ca0
rcu: rcu_preempt kthread starved for 1381 jiffies! g40261 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:27288 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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: 50 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 d9 c9 45 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90000a07678 EFLAGS: 00000206
RAX: ca76f15733f7d200 RBX: 0000000000000001 RCX: ca76f15733f7d200
RDX: ffff888021288000 RSI: ffffffff8d9d16c7 RDI: ffffffff8bc074e0
RBP: 00000000ffffffff R08: ffffc90000a079c0 R09: ffffc90000a079d0
R10: ffffc90000a07820 R11: fffff52000140f06 R12: 0000000000000246
R13: ffff888021288000 R14: ffffffff8e13d320 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff888125e0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561768a3a008 CR3: 00000000293d8000 CR4: 00000000003526f0
Call Trace:
__in6_dev_get include/net/addrconf.h:347 [inline]
ip6_ignore_linkdown include/net/addrconf.h:443 [inline]
find_match+0xf1/0xc90 net/ipv6/route.c:780
__find_rr_leaf+0x23a/0x6d0 net/ipv6/route.c:868
find_rr_leaf net/ipv6/route.c:889 [inline]
rt6_select net/ipv6/route.c:933 [inline]
fib6_table_lookup+0x39f/0xa80 net/ipv6/route.c:2233
ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2269
pol_lookup_func include/net/ip6_fib.h:617 [inline]
fib6_rule_lookup+0x52f/0x6f0 net/ipv6/fib6_rules.c:120
ip6_route_input_lookup net/ipv6/route.c:2338 [inline]
ip6_route_input+0x6de/0xad0 net/ipv6/route.c:2641
ip6_rcv_finish+0x141/0x2e0 net/ipv6/ip6_input.c:77
ip_sabotage_in+0x1de/0x270 net/bridge/br_netfilter_hooks.c:990
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x206/0x3a0 include/linux/netfilter.h:316
__netif_receive_skb_one_core net/core/dev.c:6079 [inline]
__netif_receive_skb+0xd3/0x380 net/core/dev.c:6192
netif_receive_skb_internal net/core/dev.c:6278 [inline]
netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337
NF_HOOK+0x9d/0x390 include/linux/netfilter.h:319
br_handle_frame_finish+0x15c6/0x1c50 net/bridge/br_input.c:235
br_nf_hook_thresh+0x3c6/0x4a0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x999/0xd60 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x97f/0x14c0 net/bridge/br_input.c:442
__netif_receive_skb_core+0x10b9/0x4380 net/core/dev.c:5966
__netif_receive_skb_one_core net/core/dev.c:6077 [inline]
__netif_receive_skb+0x72/0x380 net/core/dev.c:6192
process_backlog+0x60e/0x14f0 net/core/dev.c:6544
__napi_poll+0xc4/0x360 net/core/dev.c:7594
napi_poll net/core/dev.c:7657 [inline]
net_rx_action+0x5f7/0xdf0 net/core/dev.c:7784
handle_softirqs+0x283/0x870 kernel/softirq.c:622
do_softirq+0xec/0x180 kernel/softirq.c:523
__local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450
local_bh_enable include/linux/bottom_half.h:33 [inline]
fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
kernel_fpu_end+0xd2/0x120 arch/x86/kernel/fpu/core.c:479
blake2s_compress+0xe9/0x1b80 lib/crypto/x86/blake2s.h:44
blake2s_update+0x1cb/0x450 lib/crypto/blake2s.c:133
blake2s include/crypto/blake2s.h:100 [inline]
compute_mac1+0x145/0x1a0 drivers/net/wireguard/cookie.c:80
wg_cookie_add_mac_to_packet+0x57/0x1a0 drivers/net/wireguard/cookie.c:163
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:35 [inline]
wg_packet_handshake_send_worker+0x17c/0x320 drivers/net/wireguard/send.c:51
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245