BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! turning off the locking correctness validator. CPU: 1 UID: 0 PID: 30741 Comm: kworker/u8:58 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 add_chain_cache kernel/locking/lockdep.c:-1 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x107b/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 update_cfs_rq_load_avg+0x7d/0x4e0 kernel/sched/fair.c:4853 update_load_avg+0x1b0/0x1eb0 kernel/sched/fair.c:4983 dequeue_entity kernel/sched/fair.c:5689 [inline] dequeue_entities+0x54d/0x39e0 kernel/sched/fair.c:7346 dequeue_task_fair+0x200/0x660 kernel/sched/fair.c:7442 sched_change_begin+0x3da/0x680 kernel/sched/core.c:11181 class_sched_change_constructor kernel/sched/sched.h:4130 [inline] do_set_cpus_allowed+0x23/0x90 kernel/sched/core.c:2755 migrate_disable_switch kernel/sched/core.c:2425 [inline] __schedule+0x1889/0x5620 kernel/sched/core.c:7045 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8b0 kernel/entry/common.c:164 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 RIP: 0010:lock_release+0x12/0x3c0 kernel/locking/lockdep.c:5876 Code: ff ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 30 <49> 89 f5 49 89 fe 65 48 8b 05 10 6b c9 10 48 89 44 24 28 0f 1f 44 RSP: 0018:ffffc900059aea10 EFLAGS: 00000282 RAX: 0000000000000001 RBX: ffffffff9019c801 RCX: 0000000080000001 RDX: ffffc900059aeb01 RSI: ffffffff8176c226 RDI: ffffffff8dfc8000 RBP: dffffc0000000000 R08: ffffc900059aec80 R09: 0000000000000000 R10: ffffc900059aeb98 R11: fffff52000b35d75 R12: ffffc900059aec90 R13: ffffc900059a8000 R14: ffffc900059aeb48 R15: ffffffff8176c226 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0x1bba/0x2550 arch/x86/kernel/unwind_orc.c:709 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6251 [inline] kmem_cache_free+0x187/0x6c0 mm/slub.c:6378 kfree_skb_reason include/linux/skbuff.h:1324 [inline] kfree_skb include/linux/skbuff.h:1333 [inline] sfb_enqueue+0xc1b/0x1820 net/sched/sch_sfb.c:434 dev_qdisc_enqueue+0x4e/0x260 net/core/dev.c:4174 __dev_xmit_skb net/core/dev.c:4289 [inline] __dev_queue_xmit+0x1b19/0x3900 net/core/dev.c:4831 dev_queue_xmit include/linux/netdevice.h:3418 [inline] neigh_hh_output include/net/neighbour.h:544 [inline] neigh_output include/net/neighbour.h:558 [inline] ip_finish_output2+0xcab/0x10b0 net/ipv4/ip_output.c:237 ip_do_fragment+0x87c/0x1770 net/ipv4/ip_output.c:915 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 iptunnel_xmit+0x654/0xda0 net/ipv4/ip_tunnel_core.c:97 udp_tunnel_xmit_skb+0x2b8/0x410 net/ipv4/udp_tunnel_core.c:193 send4+0xa50/0xed0 drivers/net/wireguard/socket.c:85 wg_socket_send_skb_to_peer+0xe8/0x200 drivers/net/wireguard/socket.c:174 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x203/0x350 drivers/net/wireguard/send.c:51 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478 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 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: f3 0f 1e fa endbr64 19: 55 push %rbp 1a: 41 57 push %r15 1c: 41 56 push %r14 1e: 41 55 push %r13 20: 41 54 push %r12 22: 53 push %rbx 23: 48 83 ec 30 sub $0x30,%rsp * 27: 49 89 f5 mov %rsi,%r13 <-- trapping instruction 2a: 49 89 fe mov %rdi,%r14 2d: 65 48 8b 05 10 6b c9 mov %gs:0x10c96b10(%rip),%rax # 0x10c96b45 34: 10 35: 48 89 44 24 28 mov %rax,0x28(%rsp) 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 44 rex.R