bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:09:53:8d:83:69, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16381/2:b..l
rcu: (detected by 0, t=10502 jiffies, g=72609, q=892 ncpus=1)
task:syz.1.2099 state:R running task stack:24424 pid:16381 tgid:16379 ppid:5831 task_flags:0x2040054c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x13/0x2d0 kernel/locking/lockdep.c:5876
Code: 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 49 89 f4 53 48 89 fb <48> 83 ec 18 65 48 8b 05 d9 b3 18 12 48 89 44 24 10 31 c0 0f 1f 44
RSP: 0018:ffffc9000c0c68a8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8e3c94a0 RCX: ffffc9000c0c8001
RDX: 0000000000000000 RSI: ffffffff816c79a4 RDI: ffffffff8e3c94a0
RBP: 0000000000000001 R08: 0000000000000001 R09: 000000000ac0d5af
R10: 0000000000000002 R11: 00000000000080bb R12: ffffffff816c79a4
R13: ffffc9000c0c6948 R14: ffffc9000c0c7dc8 R15: ffffc9000c0c697c
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
slab_free_hook mm/slub.c:2501 [inline]
slab_free mm/slub.c:6668 [inline]
kmem_cache_free+0x15e/0x770 mm/slub.c:6779
mempool_free+0xde/0x130 mm/mempool.c:712
bio_put_percpu_cache block/bio.c:808 [inline]
bio_put+0x355/0x5b0 block/bio.c:827
bio_endio+0x751/0x8a0 block/bio.c:1675
blk_update_request+0x914/0x15c0 block/blk-mq.c:1007
blk_mq_end_request+0x59/0x430 block/blk-mq.c:1169
blk_mq_complete_request block/blk-mq.c:1347 [inline]
blk_mq_complete_request+0x8b/0xb0 block/blk-mq.c:1344
nullb_complete_cmd drivers/block/null_blk/main.c:1402 [inline]
null_handle_cmd drivers/block/null_blk/main.c:1454 [inline]
null_queue_rq+0xb69/0xfd0 drivers/block/null_blk/main.c:1693
null_queue_rqs+0xe9/0x2f0 drivers/block/null_blk/main.c:1707
__blk_mq_flush_list block/blk-mq.c:2848 [inline]
__blk_mq_flush_list+0x9a/0xc0 block/blk-mq.c:2844
blk_mq_dispatch_queue_requests+0x184/0x7b0 block/blk-mq.c:2893
blk_mq_flush_plug_list+0x1f2/0x600 block/blk-mq.c:2981
blk_add_rq_to_plug+0x1ca/0x540 block/blk-mq.c:1408
blk_mq_submit_bio+0x1a06/0x2c50 block/blk-mq.c:3233
__submit_bio+0x3cc/0x690 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x53d/0xbe0 block/blk-core.c:755
submit_bio_noacct+0x5bd/0x1f40 block/blk-core.c:879
__block_write_full_folio+0x735/0xe00 fs/buffer.c:1933
block_write_full_folio+0x31d/0x3e0 fs/buffer.c:2753
blkdev_writepages+0xb8/0x140 block/fops.c:487
do_writepages+0x27a/0x600 mm/page-writeback.c:2598
filemap_writeback+0x225/0x2d0 mm/filemap.c:387
filemap_fdatawrite_range mm/filemap.c:412 [inline]
filemap_write_and_wait_range mm/filemap.c:684 [inline]
filemap_write_and_wait_range+0xa6/0x130 mm/filemap.c:675
filemap_write_and_wait include/linux/pagemap.h:65 [inline]
sync_blockdev block/bdev.c:277 [inline]
sync_blockdev block/bdev.c:273 [inline]
bdev_release+0x4d3/0x6d0 block/bdev.c:1143
blkdev_release+0x15/0x20 block/fops.c:706
__fput+0x402/0xb70 fs/file_table.c:468
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x87f/0x2bd0 kernel/exit.c:971
do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
get_signal+0x2671/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91f218f7c9
RSP: 002b:00007f91f2f6b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: fffffffffffffffc RBX: 00007f91f23e5fa0 RCX: 00007f91f218f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000080
RBP: 00007f91f2213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f91f23e6038 R14: 00007f91f23e5fa0 R15: 00007fffabad1618
rcu: rcu_preempt kthread starved for 257 jiffies! g72609 f0x0 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:28120 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 8910 Comm: kworker/u10:32 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x70 kernel/kcov.c:217
Code: 00 00 5b e9 32 13 ec 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 65 48 8b 15 d8 d9 f3 11 <65> 8b 05 e9 d9 f3 11 a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00
RSP: 0018:ffffc900000074e8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88805af52800 RCX: ffffffff8a1edceb
RDX: ffff8880318bdb80 RSI: ffffffff8a1ede07 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8880318be6b0 R12: 0000000000000001
R13: ffffc900000077f8 R14: 0000000000000000 R15: ffff88805af51cc8
FS: 0000000000000000(0000) GS:ffff8881248fd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d533fd608 CR3: 000000007b8a0000 CR4: 00000000003526f0
Call Trace:
__find_rr_leaf+0x367/0xe00 net/ipv6/route.c:833
find_rr_leaf net/ipv6/route.c:889 [inline]
rt6_select net/ipv6/route.c:933 [inline]
fib6_table_lookup+0x57c/0xa30 net/ipv6/route.c:2233
ip6_pol_route+0x1cc/0x1230 net/ipv6/route.c:2269
pol_lookup_func include/net/ip6_fib.h:617 [inline]
fib6_rule_lookup+0x536/0x720 net/ipv6/fib6_rules.c:120
ip6_route_input_lookup net/ipv6/route.c:2338 [inline]
ip6_route_input+0x662/0xc70 net/ipv6/route.c:2641
ip6_rcv_finish_core.constprop.0+0x1a0/0x5d0 net/ipv6/ip6_input.c:66
ip6_rcv_finish net/ipv6/ip6_input.c:77 [inline]
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
ipv6_rcv+0x1e8/0x650 net/ipv6/ip6_input.c:311
__netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:6137
__netif_receive_skb+0x1d/0x160 net/core/dev.c:6250
process_backlog+0x4a2/0x1650 net/core/dev.c:6602
__napi_poll.constprop.0+0xb3/0x540 net/core/dev.c:7666
napi_poll net/core/dev.c:7729 [inline]
net_rx_action+0x9f9/0xfa0 net/core/dev.c:7881
handle_softirqs+0x219/0x950 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:510
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:450
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
wg_index_hashtable_insert+0x5b2/0x9f0 drivers/net/wireguard/peerlookup.c:161
wg_noise_handshake_create_initiation+0x4fc/0x610 drivers/net/wireguard/noise.c:569
wg_packet_send_handshake_initiation+0x19a/0x360 drivers/net/wireguard/send.c:34
wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
net_ratelimit: 12441 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:09:53:8d:83:69, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:09:53:8d:83:69, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 13490 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:09:53:8d:83:69, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:72:09:53:8d:83:69, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)