bridge0: topology change detected, propagating
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P20347/1:b..l..
rcu: (detected by 0, t=10503 jiffies, g=133909, q=1446 ncpus=2)
task:syz.8.3302 state:R running task stack:25608 pid:20347 tgid:20347 ppid:8494 task_flags:0x40004c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7585
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:524 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5968
Code: af f2 11 00 00 00 00 eb b5 e8 fb 1c 47 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 93 67 f2 11 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 78 47 d9
RSP: 0018:ffffc90005d0f2b8 EFLAGS: 00000286
RAX: 2dac3227671bce00 RBX: 0000000000000206 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e6a1508 RDI: ffffffff8c6dd480
RBP: ffff888079ef0bd8 R08: ffffffff81d975c6 R09: 0000000000000000
R10: ffffc90005d0f3d8 R11: ffffffff81b37c90 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8ed5c2a0 R15: ffff888079ef0000
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
is_bpf_text_address+0x28d/0x2b0 kernel/bpf/core.c:752
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3287 [inline]
call_rcu+0x86/0x300 kernel/rcu/tree.c:3395
slab_free_hook mm/slub.c:2744 [inline]
slab_free mm/slub.c:6630 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6757
anon_vma_free mm/rmap.c:137 [inline]
__put_anon_vma+0x126/0x2d0 mm/rmap.c:2971
put_anon_vma mm/internal.h:301 [inline]
unlink_anon_vmas+0x544/0x720 mm/rmap.c:538
free_pgtables+0x663/0xb70 mm/memory.c:401
exit_mmap+0x4aa/0x9f0 mm/mmap.c:1327
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x18e/0x240 kernel/exit.c:586
do_exit+0x6a8/0x2380 kernel/exit.c:967
do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
__do_sys_exit_group kernel/exit.c:1134 [inline]
__se_sys_exit_group kernel/exit.c:1132 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1132
x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a29f9e159
RSP: 002b:00007ffe24d20bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a29f9e159
RDX: 00007f3a291f9000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe24d20c5c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000021e
R13: 00000000000927c0 R14: 0000000000122615 R15: 00007ffe24d20cb0
rcu: rcu_preempt kthread starved for 2398 jiffies! g133909 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
__schedule_loop kernel/sched/core.c:7382 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7397
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 12908 Comm: kworker/u8:34 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:__lock_acquire+0xb06/0x2de0 kernel/locking/lockdep.c:5285
Code: c7 c6 51 01 54 8e 67 48 0f b9 3a 90 31 c0 48 83 78 40 00 0f 84 73 1d 00 00 49 8b 45 20 25 ff 1f 00 00 48 0f a3 05 4a 47 f8 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 80 90 49 3d 94 eb 32 83 3d 11 d7
RSP: 0018:ffffc90000a37bb8 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000002fcf7df RCX: 00000000add6e078
RDX: 000000004dbb4af1 RSI: 000000005970cd9e RDI: ffff888034c9ddc0
RBP: 03813abc00000000 R08: ffffffff8178099f R09: 0000000000000000
R10: ffffc90000a37e98 R11: ffffffff81b37c90 R12: 0000000000004000
R13: ffff888034c9ea88 R14: ffff888034c9ea88 R15: 0000000000000007
FS: 0000000000000000(0000) GS:ffff888124db7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f328c03feb8 CR3: 0000000077ac4000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_node_noprof+0x34f/0x600 mm/slub.c:5105
__alloc_skb+0x1db/0x7a0 net/core/skbuff.c:704
alloc_skb include/linux/skbuff.h:1384 [inline]
synproxy_send_client_synack_ipv6+0x16e/0xcd0 net/netfilter/nf_synproxy_core.c:883
nft_synproxy_eval_v6+0x362/0x4e0 net/netfilter/nft_synproxy.c:90
nft_synproxy_do_eval+0x3ff/0x5d0 net/netfilter/nft_synproxy.c:146
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:545
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6265 [inline]
__netif_receive_skb net/core/dev.c:6378 [inline]
process_backlog+0x795/0x18b0 net/core/dev.c:6729
__napi_poll+0xaa/0x330 net/core/dev.c:7798
napi_poll net/core/dev.c:7861 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8018
handle_softirqs+0x223/0x840 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
wg_index_hashtable_insert+0x100/0x880 drivers/net/wireguard/peerlookup.c:126
wg_noise_handshake_create_initiation+0x638/0x810 drivers/net/wireguard/noise.c:569
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline]
wg_packet_handshake_send_worker+0x18c/0x370 drivers/net/wireguard/send.c:51
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245