rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22166/1:b..l..
rcu: (detected by 0, t=10504 jiffies, g=108045, q=1145054 ncpus=2)
task:syz.4.3798 state:R running task stack:25512 pid:22166 tgid:22166 ppid:19327 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 6e 61 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 58 3d 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f 81 64 0a cc 48 8d 3d 07 1c 1d
RSP: 0018:ffffc900074cf120 EFLAGS: 00000292
RAX: a57572d19741fa00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000004dd27fc4 RSI: ffffffff8e9348d6 RDI: ffffffff8c8ea180
RBP: ffff888024bf9f40 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc900074cf258 R11: ffffffff81b3a390 R12: ffffffff9015a2a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
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
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2957
__slab_free+0x269/0x2c0 mm/slub.c:5926
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
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_noprof+0x2b4/0x600 mm/slub.c:5047
vm_area_dup+0x32/0x8e0 mm/vma_init.c:128
__split_vma+0x2db/0x8a0 mm/vma.c:549
split_vma mm/vma.c:633 [inline]
vma_modify+0x9df/0x25c0 mm/vma.c:1788
vma_modify_flags+0x2a4/0x3c0 mm/vma.c:1816
mprotect_fixup+0x54f/0xf20 mm/mprotect.c:823
do_mprotect_pkey+0x8e7/0xd40 mm/mprotect.c:1001
__do_sys_mprotect mm/mprotect.c:1022 [inline]
__se_sys_mprotect mm/mprotect.c:1019 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:1019
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: 0033:0x7fcd9f1a8d17
RSP: 002b:00007ffcae5c35c8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fcd9d3936c0 RCX: 00007fcd9f1a8d17
RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007fcd9d374000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffcae5c3720
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 1221 jiffies! g108045 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:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
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:
CPU: 0 UID: 0 PID: 1092 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 3d 71 9c f5 f7 c3 00 02 00 00 74 05 e8 c0 13 c9 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 74 65 8d f5 65 48 8b 05 ac 21 d9 08 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90000006c60 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000286 RCX: 8000000000000102
RDX: 0000000000000002 RSI: ffffffff8e6a8cfb RDI: 0000000000000001
RBP: ffff88815266b9e8 R08: ffffffff91bdf9bf R09: 1ffffffff237bf37
R10: dffffc0000000000 R11: fffffbfff237bf38 R12: ffffffff8c2e5a30
R13: ffff88815266b9d8 R14: ffffffff9c114b28 R15: 1ffff1102a4cd73d
FS: 0000000000000000(0000) GS:ffff888123409000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b9b9fff0c CR3: 000000004233e000 CR4: 00000000003526f0
Call Trace:
debug_object_activate+0x2ec/0x420 lib/debugobjects.c:891
debug_rcu_head_queue kernel/rcu/rcu.h:245 [inline]
rcu_do_enqueue+0x2a/0x870 kernel/rcu/tree.c:3164
__call_rcu_common kernel/rcu/tree.c:3300 [inline]
call_rcu+0x20e/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
nf_conntrack_free+0x55d/0x710 net/netfilter/nf_conntrack_core.c:1740
nf_ct_put include/net/netfilter/nf_conntrack.h:185 [inline]
nf_conntrack_in+0x9f0/0x15f0 net/netfilter/nf_conntrack_core.c:2059
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
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_ipv4+0x195/0x290 net/netfilter/nft_chain_filter.c:24
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
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:6437 [inline]
__netif_receive_skb net/core/dev.c:6550 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6901
__napi_poll+0xaa/0x330 net/core/dev.c:7987
napi_poll net/core/dev.c:8050 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8207
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
blake2s_compress+0xfa/0x1c00 lib/crypto/x86/blake2s.h:42
blake2s_final+0x10f/0x270 lib/crypto/blake2s.c:142
hmac+0x2dc/0x3b0 drivers/net/wireguard/noise.c:333
kdf drivers/net/wireguard/noise.c:367 [inline]
message_ephemeral+0x255/0x310 drivers/net/wireguard/noise.c:493
wg_noise_handshake_create_initiation+0x24f/0x810 drivers/net/wireguard/noise.c:545
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