rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11128/1:b..l P9358/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=247785, q=1733 ncpus=2)
task:syz-executor state:R running task stack:22240 pid:9358 tgid:9358 ppid:9354 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 41 30 2c 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 2b 3b ca 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 10 31 2f 0a cc 48 8d 3d 78 d4 b8
RSP: 0018:ffffc90004d1f200 EFLAGS: 00000286
RAX: 7d630c591cf25f00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000045705e6d RSI: ffffffff8e4ae78c RDI: ffffffff8c4bd280
RBP: ffffffff823de4ae R08: ffffffff823de4ae R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c20 R12: 0000000000000002
R13: ffffffff8eb59c20 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:840 [inline]
__update_page_owner_free_handle+0x4b/0x470 mm/page_owner.c:283
__reset_page_owner+0x85/0x1f0 mm/page_owner.c:321
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
__slab_free+0x274/0x2c0 mm/slub.c:5767
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_kmalloc+0x22/0xb0 mm/kasan/common.c:406
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_node_noprof+0x3ce/0x630 mm/slub.c:5534
_kmalloc_node_noprof include/linux/slab.h:1174 [inline]
__get_vm_area_node+0x136/0x300 mm/vmalloc.c:3215
__vmalloc_node_range_noprof+0x358/0x1730 mm/vmalloc.c:4042
__vmalloc_node_noprof mm/vmalloc.c:4143 [inline]
vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4221
alloc_counters+0x63/0x5c0 net/ipv4/netfilter/ip_tables.c:799
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:821 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1020 [inline]
do_ipt_get_ctl+0xb3c/0x1300 net/ipv4/netfilter/ip_tables.c:1669
nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x19e/0x230 net/ipv4/ip_sockglue.c:1777
do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2474
__sys_getsockopt net/socket.c:2505 [inline]
__do_sys_getsockopt net/socket.c:2512 [inline]
__se_sys_getsockopt net/socket.c:2509 [inline]
__x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2509
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd069f9f62a
RSP: 002b:00007ffe190729f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffe19072a80 RCX: 00007fd069f9f62a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffe19072a1c R09: 0000000000000000
R10: 00007ffe19072a80 R11: 0000000000000216 R12: 00007fd06a1edfc0
R13: 00007ffe19072a1c R14: 0000000000000000 R15: 00007fd06a1f0180
task:syz.4.10040 state:R running task stack:25584 pid:11128 tgid:11127 ppid:8545 task_flags:0x40054c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:deref_stack_reg+0x3/0x220 arch/x86/kernel/unwind_orc.c:418
Code: 89 4c 24 18 e8 be dc bc 00 48 8b 4c 24 18 e9 f2 fe ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 10 48 89 d3 49 89 f0 49 89 ff 48 be
RSP: 0018:ffffc90005116b48 EFLAGS: 00000283
RAX: fffffffffffffff0 RBX: ffffffff90fb7c2a RCX: 0000000000000000
RDX: ffffc90005116c48 RSI: ffffc90005116f70 RDI: ffffc90005116c08
RBP: 1ffffffff21f6f85 R08: ffffc90005116f70 R09: 0000000000000000
R10: ffffc90005116c58 R11: fffff52000a22d8d R12: dffffc0000000000
R13: ffffffff90fb7c2b R14: ffffc90005116c08 R15: ffffc90005116c50
unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
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:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
free_unref_folios+0xd84/0x14a0 mm/page_alloc.c:3011
folios_put_refs+0x9e9/0xb30 mm/swap.c:1057
free_pages_and_swap_cache+0x2ba/0x490 mm/swap_state.c:586
__tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:424
zap_pte_range mm/memory.c:1973 [inline]
zap_pmd_range mm/memory.c:2020 [inline]
zap_pud_range mm/memory.c:2048 [inline]
zap_p4d_range mm/memory.c:2069 [inline]
__zap_vma_range+0x4130/0x4f10 mm/memory.c:2109
unmap_vmas+0x390/0x550 mm/memory.c:2178
exit_mmap+0x293/0x9f0 mm/mmap.c:1300
__mmput+0x118/0x420 kernel/fork.c:1182
exit_mm+0x221/0x2d0 kernel/exit.c:610
do_exit+0x6cd/0x2360 kernel/exit.c:992
do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
get_signal+0x121b/0x12c0 kernel/signal.c:3038
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+0x104/0x730 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:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f966699de59
RSP: 002b:00007f966778e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000200000001000 RBX: 00007f9666c25fa0 RCX: 00007f966699de59
RDX: 000000000000000a RSI: 0000000000c00000 RDI: 0000200000001000
RBP: 00007f9666a33e6f R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000003032 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9666c26038 R14: 00007f9666c25fa0 R15: 00007ffc226049c8
rcu: rcu_preempt kthread starved for 585 jiffies! g247785 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 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: 27236 Comm: kworker/u8:49 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4879 [inline]
RIP: 0010:__lock_acquire+0x52e/0x2cf0 kernel/locking/lockdep.c:5187
Code: 00 48 83 c3 28 41 89 c4 49 39 cf 0f 8d a4 00 00 00 49 83 ff 31 0f 83 83 00 00 00 8b 03 25 ff 1f 00 00 48 0f a3 05 b2 f9 d1 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 10 25 15 94 eb 32 83 3d 79 89
RSP: 0018:ffffc90000007730 EFLAGS: 00000003
RAX: 0000000000000007 RBX: ffff88807eef4a60 RCX: 00000000000827e8
RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff84dddf4b R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff9a9f5dc8 R12: 0000000000000003
R13: ffff88807eef4a68 R14: ffff88807eef3e00 R15: 0000000000000004
FS: 0000000000000000(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd06a1ea458 CR3: 000000002f4b2000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
__debug_check_no_obj_freed lib/debugobjects.c:1160 [inline]
debug_check_no_obj_freed+0xcb/0x450 lib/debugobjects.c:1201
slab_free_hook mm/slub.c:2636 [inline]
slab_free mm/slub.c:6405 [inline]
kmem_cache_free+0xfd/0x650 mm/slub.c:6532
kfree_skb_reason include/linux/skbuff.h:1323 [inline]
kfree_skb include/linux/skbuff.h:1332 [inline]
ip6_mc_input+0x909/0xbc0 net/ipv6/ip6_input.c:638
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6206 [inline]
__netif_receive_skb net/core/dev.c:6319 [inline]
process_backlog+0x774/0x1860 net/core/dev.c:6670
__napi_poll+0xaa/0x330 net/core/dev.c:7729
napi_poll net/core/dev.c:7792 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:7949
handle_softirqs+0x225/0x840 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
blake2s_compress+0xfa/0x1c00 lib/crypto/x86/blake2s.h:42
blake2s_update+0x140/0x450 lib/crypto/blake2s.c:119
hmac+0x1f4/0x3b0 drivers/net/wireguard/noise.c:324
kdf+0x184/0x290 drivers/net/wireguard/noise.c:375
mix_precomputed_dh drivers/net/wireguard/noise.c:426 [inline]
wg_noise_handshake_create_initiation+0x460/0x810 drivers/net/wireguard/noise.c:560
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:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 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