rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=101861, q=749 ncpus=2)
task:kworker/0:1 state:R running task stack:21016 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events rht_deferred_worker
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7291
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 db 13 4a 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900000f71d0 EFLAGS: 00000206
RAX: 18d6043c23628000 RBX: 0000000000000206 RCX: 18d6043c23628000
RDX: 0000000000000004 RSI: ffffffff8de7b578 RDI: ffffffff8c053d60
RBP: ffff88801c6b2a10 R08: ffffc900000f7e50 R09: 0000000000000000
R10: ffffc900000f7358 R11: fffff5200001ee6d R12: 0000000000000004
R13: 0000000000000004 R14: ffffffff8e53d260 R15: ffff88801c6b1e40
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1169 [inline]
unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
discard_slab mm/slub.c:3294 [inline]
__put_partials+0x146/0x170 mm/slub.c:3841
put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3916
__slab_free+0x2b9/0x390 mm/slub.c:5881
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:408
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5602 [inline]
__kvmalloc_node_noprof+0x5cd/0x910 mm/slub.c:7028
bucket_table_alloc lib/rhashtable.c:186 [inline]
rhashtable_rehash_alloc+0xa4/0x2a0 lib/rhashtable.c:367
rht_deferred_worker+0x4f8/0x2430 lib/rhashtable.c:-1
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
rcu: rcu_preempt kthread starved for 634 jiffies! g101861 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:27224 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16051 Comm: kworker/1:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
RIP: 0010:skb_orphan+0xc/0xd0 include/linux/skbuff.h:3368
Code: ff ff e8 e7 59 81 f7 e9 5e fd ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 48 89 fb <49> bc 00 00 00 00 00 fc ff df e8 b5 59 81 f7 4c 8d 73 60 4d 89 f5
RSP: 0018:ffffc90000a07f08 EFLAGS: 00000246
RAX: ffffffff8a3e6f8b RBX: ffff88814c4a5780 RCX: ffff88801c75dac0
RDX: 0000000000000100 RSI: ffffffff8de7b578 RDI: ffff88814c4a5780
RBP: 000000000000003a R08: ffff88814c4a57bf R09: 0000000000000000
R10: ffff88814c4a57a8 R11: ffffed1029894af8 R12: ffff88814c4a5838
R13: ffff888079b496f0 R14: ffff8880774ca868 R15: ffff88814c4a57e0
FS: 0000000000000000(0000) GS:ffff8881258a2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055de7f39bf28 CR3: 000000004e3ca000 CR4: 00000000003526f0
Call Trace:
ip6_rcv_core+0x1023/0x1590 net/ipv6/ip6_input.c:292
ipv6_rcv+0x72/0xc0 net/ipv6/ip6_input.c:308
__netif_receive_skb_one_core net/core/dev.c:6072 [inline]
__netif_receive_skb+0xd3/0x380 net/core/dev.c:6185
netif_receive_skb_internal net/core/dev.c:6271 [inline]
netif_receive_skb+0x1cb/0x790 net/core/dev.c:6330
NF_HOOK+0xa0/0x390 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+0x982/0x14c0 net/bridge/br_input.c:442
__netif_receive_skb_core+0x10b9/0x4020 net/core/dev.c:5959
__netif_receive_skb_one_core net/core/dev.c:6070 [inline]
__netif_receive_skb+0x72/0x380 net/core/dev.c:6185
process_backlog+0x60e/0x14f0 net/core/dev.c:6537
__napi_poll+0xc7/0x360 net/core/dev.c:7587
napi_poll net/core/dev.c:7650 [inline]
net_rx_action+0x707/0xe30 net/core/dev.c:7777
handle_softirqs+0x286/0x870 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+0x14b/0x450 lib/crypto/blake2s.c:126
hmac+0x1b6/0x330 drivers/net/wireguard/noise.c:324
kdf+0xde/0x270 drivers/net/wireguard/noise.c:360
mix_precomputed_dh drivers/net/wireguard/noise.c:426 [inline]
wg_noise_handshake_consume_initiation+0x3c7/0x900 drivers/net/wireguard/noise.c:623
wg_receive_handshake_packet drivers/net/wireguard/receive.c:144 [inline]
wg_packet_handshake_receive_worker+0x5f2/0xfb0 drivers/net/wireguard/receive.c:213
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