rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21667/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=88041, q=856126 ncpus=2)
task:syz.0.4027 state:R running task stack:26560 pid:21667 tgid:21665 ppid:16963 task_flags:0x40054c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x920 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__module_address+0x6/0x3e0 kernel/module/main.c:3905
Code: 89 ff 49 89 c5 e8 da be 87 00 4c 89 e8 e9 33 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 41 57 <41> 56 41 55 41 54 53 48 3b 3d 5c c0 ef 0d 0f 82 8b 02 00 00 48 3b
RSP: 0018:ffffc90005fe7350 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81b136dd RCX: 8000000000000001
RDX: 00000000f62de949 RSI: ffffffff8c6ddb60 RDI: 00007ff57ad5ed8e
RBP: 0000000000000001 R08: ffffffff81b136dd R09: 0000000000000000
R10: ffffc90005fe7438 R11: ffffffff81b2c5e0 R12: ffff888035305dc0
R13: 0000000000000000 R14: 00007ff57ad5ed8e R15: 1ffff92000bfce86
__module_text_address kernel/module/main.c:3964 [inline]
is_module_text_address+0x88/0x1e0 kernel/module/main.c:3939
kernel_text_address+0x94/0xe0 kernel/extable.c:119
__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
slab_free_hook mm/slub.c:2709 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x45e/0x650 mm/slub.c:6636
tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
exit_mmap+0x4ca/0x9f0 mm/mmap.c:1335
__mmput+0x118/0x420 kernel/fork.c:1193
exit_mm+0x18e/0x240 kernel/exit.c:592
do_exit+0x6cd/0x2360 kernel/exit.c:974
do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
get_signal+0x121b/0x12c0 kernel/signal.c:3112
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff57ad5ed8e
RSP: 002b:00007ff57bc3af38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007ff57bc3c6c0 RCX: 00007ff57ad5ed8e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff57b026038 R14: 00007ff57b025fa0 R15: 00007ffedcd3ba78
rcu: rcu_preempt kthread starved for 1716 jiffies! g88041 f0x2 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:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20754 Comm: kworker/u8:30 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
RIP: 0010:lock_class_cache_is_valid kernel/locking/lockdep.c:978 [inline]
RIP: 0010:__lock_acquire+0xd7/0x2de0 kernel/locking/lockdep.c:5155
Code: c9 75 4f 48 c7 c1 d0 c4 3c 95 48 89 c2 48 29 ca 48 c1 fa 03 48 b9 29 5c 8f c2 f5 28 5c 8f 48 0f af ca 48 0f a3 0d d9 59 f8 13 <73> 26 48 8b 0b 48 85 c9 74 1e ba 01 00 00 00 85 f6 75 09 8b 50 58
RSP: 0018:ffffc900000065f8 EFLAGS: 00000803
RAX: ffffffff953cca48 RBX: ffffffff8fd5c8e0 RCX: 0000000000000007
RDX: 00000000000000af RSI: 0000000000000000 RDI: ffffffff8fd5c8e0
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900000068d8 R11: ffffffff81b2c5e0 R12: ffffffff8fd5c8e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888123abf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f66c636d0 CR3: 000000007b89a000 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
ref_tracker_alloc+0x1b0/0x4b0 lib/ref_tracker.c:276
__netdev_tracker_alloc include/linux/netdevice.h:4531 [inline]
netdev_hold include/linux/netdevice.h:4560 [inline]
dst_init+0xbe/0x470 net/core/dst.c:52
dst_alloc+0x12a/0x170 net/core/dst.c:94
rt_dst_alloc net/ipv4/route.c:1683 [inline]
__mkroute_output net/ipv4/route.c:2686 [inline]
ip_route_output_key_hash_rcu+0x14ac/0x2720 net/ipv4/route.c:2906
ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2736
__ip_route_output_key include/net/route.h:169 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2963
ip_route_output_key include/net/route.h:179 [inline]
nf_dup_ipv4_route net/ipv4/netfilter/nf_dup_ipv4.c:39 [inline]
nf_dup_ipv4+0x458/0x900 net/ipv4/netfilter/nf_dup_ipv4.c:88
tee_tg4+0xe7/0x140 net/netfilter/xt_TEE.c:42
ipt_do_table+0xce5/0x15d0 net/ipv4/netfilter/ip_tables.c:345
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook+0x22a/0x3a0 include/linux/netfilter.h:280
__ip_local_out+0x558/0x6a0 net/ipv4/ip_output.c:120
ip_local_out+0x2a/0x190 net/ipv4/ip_output.c:129
synproxy_send_client_synack+0x89b/0xde0 net/netfilter/nf_synproxy_core.c:487
nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
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
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6297 [inline]
__netif_receive_skb net/core/dev.c:6410 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6761
__napi_poll+0xaa/0x330 net/core/dev.c:7830
napi_poll net/core/dev.c:7893 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8050
handle_softirqs+0x226/0x860 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
blake2s_compress+0xfa/0x1c00 lib/crypto/x86/blake2s.h:42
blake2s_final+0x10f/0x260 lib/crypto/blake2s.c:142
hmac+0x204/0x3b0 drivers/net/wireguard/noise.c:325
kdf+0x12d/0x290 drivers/net/wireguard/noise.c:367
mix_dh drivers/net/wireguard/noise.c:413 [inline]
wg_noise_handshake_create_initiation+0x29e/0x810 drivers/net/wireguard/noise.c:550
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:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
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