rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=28d/1/0x4000000000000002 softirq=114605/114608 fqs=2100 (detected by 1, t=10505 jiffies, g=150585, q=1296) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15418 Comm: kworker/0:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: wg-crypt-wg0 wg_packet_tx_worker RIP: 0010:debug_smp_processor_id+0x0/0x10 lib/smp_processor_id.c:60 Code: 32 8a e8 43 01 00 00 65 c7 05 b8 5b 47 76 00 00 00 00 48 c7 c7 20 e8 32 8a e8 2c 01 00 00 65 ff 0d a1 5b 47 76 5b c3 00 00 cc <48> c7 c7 20 f7 79 8a 48 c7 c6 60 f7 79 8a eb 00 55 41 57 41 56 53 RSP: 0018:ffffc9000311f238 EFLAGS: 00000093 RAX: ffffffff81988366 RBX: dffffc0000000000 RCX: ffff88802103d940 RDX: 0000000000000000 RSI: ffffffff8a2b3a20 RDI: ffff888072526858 RBP: ffffc9000311f4c8 R08: ffffffff8d89d8af R09: 1ffffffff1b13b15 R10: dffffc0000000000 R11: fffffbfff1b13b16 R12: ffff8880b90351a8 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe74d318000 CR3: 000000000c08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_swevent_put_recursion_context kernel/events/core.c:9750 [inline] perf_tp_event+0xa72/0xbf0 kernel/events/core.c:10080 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 c2 ef 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc9000311f700 EFLAGS: 00000206 RAX: dccb3d11e6de4d00 RBX: 1ffff92000623ee4 RCX: dccb3d11e6de4d00 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f780 RBP: ffffc9000311f7e0 R08: ffffffff901d11bf R09: 1ffffffff203a237 R10: dffffc0000000000 R11: fffffbfff203a238 R12: ffffffff8c322f00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] nf_hook include/linux/netfilter.h:259 [inline] __ip6_local_out+0x806/0x850 net/ipv6/output_core.c:149 ip6_local_out+0x26/0x120 net/ipv6/output_core.c:159 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline] udp_tunnel6_xmit_skb+0x4dd/0x8f0 net/ipv6/ip6_udp_tunnel.c:109 send6+0x5ab/0x8d0 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0x10d/0x1c0 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1d3/0x790 drivers/net/wireguard/send.c:276 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287