rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1484/1:b..l P1560/2:b..l P9/3:b..l
rcu: (detected by 0, t=10502 jiffies, g=82977, q=67 ncpus=2)
task:kworker/0:0 state:R running task stack:21440 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:wg_cpumask_next_online drivers/net/wireguard/queueing.h:122 [inline]
RIP: 0010:wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:168 [inline]
RIP: 0010:wg_packet_consume_data drivers/net/wireguard/receive.c:526 [inline]
RIP: 0010:wg_packet_receive+0x132b/0x2410 drivers/net/wireguard/receive.c:576
Code: ff ff 84 c0 0f 84 2b 07 00 00 4c 89 74 24 70 4c 8b 6c 24 40 49 8d 9d 08 04 00 00 4c 89 e0 49 89 dc 49 c1 ec 03 41 0f b6 04 04 <84> c0 0f 85 d1 0c 00 00 44 8b 33 bf ff ff ff ff 44 89 f6 e8 3d 75
RSP: 0000:ffffc900000e6fa0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff8880abb51388 RCX: ffffffff85ea6e43
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88805e1f9568
RBP: ffffc900000e7110 R08: ffff88805e1f956f R09: 1ffff1100bc3f2ad
R10: dffffc0000000000 R11: ffffed100bc3f2ae R12: 1ffff1101576a271
R13: ffff8880abb50f80 R14: ffff88803ba50400 R15: 1ffff1101321556f
wg_receive+0x75/0xa0 drivers/net/wireguard/socket.c:326
udpv6_queue_rcv_one_skb+0x15bb/0x18e0 net/ipv6/udp.c:863
udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064
ip6_protocol_deliver_rcu+0xd09/0x1600 net/ipv6/ip6_input.c:438
ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6181 [inline]
__netif_receive_skb net/core/dev.c:6294 [inline]
process_backlog+0x3ce/0xc60 net/core/dev.c:6645
__napi_poll+0xaf/0x580 net/core/dev.c:7709
napi_poll net/core/dev.c:7772 [inline]
net_rx_action+0x696/0xe00 net/core/dev.c:7929
handle_softirqs+0x1de/0x6f0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
__local_bh_enable_ip+0x170/0x2b0 kernel/softirq.c:302
local_bh_enable include/linux/bottom_half.h:33 [inline]
read_unlock_bh include/linux/rwlock_rt.h:73 [inline]
wg_socket_send_skb_to_peer+0x199/0x200 drivers/net/wireguard/socket.c:184
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:kworker/u8:14 state:R running task stack:15008 pid:1560 tgid:1560 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: tipc_send tipc_conn_send_work
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:102 [inline]
rtlock_slowlock kernel/locking/rtmutex.c:1896 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x316/0x400 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:45 [inline]
prepare_to_wait_exclusive+0x44/0x220 kernel/sched/wait.c:269
__lock_sock+0x154/0x2e0 net/core/sock.c:3185
lock_sock_nested+0xb3/0x130 net/core/sock.c:3785
lock_sock include/net/sock.h:1709 [inline]
tipc_sendstream net/tipc/socket.c:1545 [inline]
tipc_send_packet+0x6e/0xa0 net/tipc/socket.c:1652
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
sock_sendmsg+0x3fb/0x450 net/socket.c:765
tipc_conn_send_to_sock net/tipc/topsrv.c:277 [inline]
tipc_conn_send_work+0x330/0xaa0 net/tipc/topsrv.c:306
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:kworker/u8:9 state:R running task stack:14392 pid:1484 tgid:1484 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: tipc_rcv tipc_conn_recv_work
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
rt_mutex_wake_up_q kernel/locking/rtmutex.c:575 [inline]
rt_mutex_slowunlock+0x681/0x8b0 kernel/locking/rtmutex.c:1469
spin_unlock_bh include/linux/spinlock_rt.h:115 [inline]
tipc_sk_rcv+0x2777/0x2bb0 net/tipc/socket.c:2498
tipc_node_xmit+0x227/0xf10 net/tipc/node.c:1701
tipc_node_xmit_skb+0x139/0x1b0 net/tipc/node.c:1766
tipc_recvmsg+0xd13/0x1430 net/tipc/socket.c:1992
sock_recvmsg_nosec net/socket.c:1078 [inline]
sock_recvmsg+0x172/0x1b0 net/socket.c:1100
tipc_conn_rcv_from_sock net/tipc/topsrv.c:401 [inline]
tipc_conn_recv_work+0x29d/0x510 net/tipc/topsrv.c:424
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g82977 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=89425
rcu: rcu_preempt kthread starved for 10502 jiffies! g82977 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27096 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 16959 Comm: syz.8.2741 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline]
RIP: 0010:lock_acquire+0xc0/0x2e0 kernel/locking/lockdep.c:5869
Code: 48 8b 05 eb ac ae 10 83 b8 b4 0b 00 00 00 0f 85 9d 00 00 00 9c 5b fa 48 c7 c7 8c ea 57 8d e8 97 3a 84 09 65 ff 05 70 f3 ae 10 <45> 31 c9 f7 c3 00 02 00 00 41 0f 94 c1 4c 89 ef 8b 74 24 04 89 ea
RSP: 0018:ffffc90006257158 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d57ea8c RDI: ffffffff8ba67a80
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed4ef7 R12: 0000000000000002
R13: ffffffff8ddcb980 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f1d062be6c0(0000) GS:ffff888126432000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000e1000 CR3: 0000000039d4c000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
net_generic+0x3a/0x240 include/net/netns/generic.h:45
tipc_sk_lookup+0xa6/0x920 net/tipc/socket.c:2996
tipc_sk_rcv+0x46e/0x2bb0 net/tipc/socket.c:2492
tipc_node_xmit+0x227/0xf10 net/tipc/node.c:1701
__tipc_sendstream+0xaff/0x12b0 net/tipc/socket.c:1622
tipc_sendstream+0x55/0x70 net/tipc/socket.c:1546
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
sock_write_iter+0x4a1/0x4f0 net/socket.c:1195
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x629/0xba0 fs/read_write.c:688
ksys_write+0x156/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d0806c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1d062be028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1d082e5fa0 RCX: 00007f1d0806c819
RDX: 000000002000011a RSI: 0000200000000340 RDI: 0000000000000004
RBP: 00007f1d08102c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d082e6038 R14: 00007f1d082e5fa0 R15: 00007ffe0c3a5b18