Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning: ------------[ cut here ]------------ lockdep bfs error:-1 WARNING: kernel/locking/lockdep.c:2059 at print_bfs_bug+0x20/0x40 kernel/locking/lockdep.c:2059, CPU#0: syz.4.8814/1339 Modules linked in: CPU: 0 UID: 0 PID: 1339 Comm: syz.4.8814 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:print_bfs_bug+0x22/0x40 kernel/locking/lockdep.c:2059 Code: 90 90 90 90 90 90 90 90 55 53 89 fb e8 27 af fc 02 89 c5 e8 f0 89 ff ff 85 ed 74 13 83 fb ff 74 16 48 8d 3d 20 c3 51 0e 89 de <67> 48 0f b9 3a 5b 5d e9 12 4a f9 09 cc 48 c7 c7 d8 a2 e4 8d e8 75 RSP: 0018:ffffc9000cf061a8 EFLAGS: 00010046 RAX: 000000000000003b RBX: 00000000ffffffff RCX: 6ef010f40e4dc600 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8ff26c60 RBP: 0000000000000001 R08: ffffc9000cf05f27 R09: 1ffff920019e0be4 R10: dffffc0000000000 R11: fffff520019e0be5 R12: ffffffff96822848 R13: ffffffff939e43c8 R14: ffff888025760000 R15: 000000000000003f FS: 00007f5c822946c0(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8004a71980 CR3: 0000000053ee0000 CR4: 00000000003526f0 Call Trace: check_irq_usage kernel/locking/lockdep.c:-1 [inline] check_prev_add kernel/locking/lockdep.c:3169 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x2550/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate+0x6c/0x3a0 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483 remove_hrtimer kernel/time/hrtimer.c:1149 [inline] hrtimer_try_to_cancel+0x300/0x5b0 kernel/time/hrtimer.c:1358 update_curr_dl_se+0x30e/0xec0 kernel/sched/deadline.c:1491 update_curr+0x226/0x4f0 kernel/sched/fair.c:1227 put_prev_entity+0x41/0x230 kernel/sched/fair.c:5504 pick_next_task_fair+0x182f/0x19d0 kernel/sched/fair.c:8949 __pick_next_task+0xeb/0x480 kernel/sched/core.c:5890 pick_next_task kernel/sched/core.c:5983 [inline] __schedule+0x7ba/0x5050 kernel/sched/core.c:6809 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7194 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 41 c0 f6 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 2b 61 52 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 50 a4 f9 09 cc 48 8d 3d 58 17 52 RSP: 0018:ffffc9000cf06b08 EFLAGS: 00000282 RAX: 6ef010f40e4dc600 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000000000002 RSI: ffffffff8df34c9c RDI: ffffffff8c073a00 RBP: ffffffff818c8665 R08: 0000000000000008 R09: ffffffff96166860 R10: 000000004a6fff66 R11: 00000000bb41944c R12: 0000000000000000 R13: ffff888032a3ed48 R14: 0000000000000001 R15: 0000000000000246 touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3940 __flush_workqueue+0x14b/0x14f0 kernel/workqueue.c:3982 drain_workqueue+0xd3/0x390 kernel/workqueue.c:4146 destroy_workqueue+0xbb/0xc60 kernel/workqueue.c:5903 wg_newlink+0x522/0x670 drivers/net/wireguard/device.c:395 rtnl_newlink_create+0x329/0xb70 net/core/rtnetlink.c:3840 __rtnl_newlink net/core/rtnetlink.c:3957 [inline] rtnl_newlink+0x1666/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5c8139bf79 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:00007f5c82294028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5c81615fa0 RCX: 00007f5c8139bf79 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f5c814327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5c81616038 R14: 00007f5c81615fa0 R15: 00007fffb7c8bdb8 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 55 push %rbp 9: 53 push %rbx a: 89 fb mov %edi,%ebx c: e8 27 af fc 02 call 0x2fcaf38 11: 89 c5 mov %eax,%ebp 13: e8 f0 89 ff ff call 0xffff8a08 18: 85 ed test %ebp,%ebp 1a: 74 13 je 0x2f 1c: 83 fb ff cmp $0xffffffff,%ebx 1f: 74 16 je 0x37 21: 48 8d 3d 20 c3 51 0e lea 0xe51c320(%rip),%rdi # 0xe51c348 28: 89 de mov %ebx,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: e9 12 4a f9 09 jmp 0x9f94a48 36: cc int3 37: 48 c7 c7 d8 a2 e4 8d mov $0xffffffff8de4a2d8,%rdi 3e: e8 .byte 0xe8 3f: 75 .byte 0x75