bridge0: left promiscuous mode 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.8.5360/22370 Modules linked in: CPU: 0 UID: 0 PID: 22370 Comm: syz.8.5360 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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 47 51 03 03 89 c5 e8 c0 89 ff ff 85 ed 74 13 83 fb ff 74 16 48 8d 3d 70 0c ed 0d 89 de <67> 48 0f b9 3a 5b 5d e9 c2 6b 89 09 cc 48 c7 c7 85 d9 7b 8d e8 d5 RSP: 0018:ffffc90005ca6318 EFLAGS: 00010046 RAX: 000000000000003b RBX: 00000000ffffffff RCX: 82d6351252d24a00 RDX: ffffc90026423000 RSI: 00000000ffffffff RDI: ffffffff8f8e3ec0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000b94c15 R12: 0000000000000022 R13: ffffffff932b6988 R14: ffff888024d80000 R15: ffffffff96322a88 FS: 00007fe14ae4e6c0(0000) GS:ffff888126117000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe2c4000020 CR3: 000000004e1f2000 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+0x24f0/0x2ce0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:382 raw_spin_rq_lock_nested+0x2d/0x160 kernel/sched/core.c:667 raw_spin_rq_lock kernel/sched/sched.h:1653 [inline] _task_rq_lock+0xc0/0x440 kernel/sched/core.c:762 class_task_rq_lock_constructor kernel/sched/sched.h:1963 [inline] migrate_disable_switch kernel/sched/core.c:2464 [inline] __schedule+0x185b/0x5500 kernel/sched/core.c:7089 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 81 fd 85 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b b8 cf 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d d8 60 ed RSP: 0018:ffffc90005ca68e0 EFLAGS: 00000282 RAX: 82d6351252d24a00 RBX: 0000000000000000 RCX: 0000000000000046 RDX: ffffffff932b6b18 RSI: ffffffff8d8a2329 RDI: ffffffff8ba92a80 RBP: ffffffff8920c37b R08: 0000000000000002 R09: ffffffff95ba8228 R10: 000000000c2023c2 R11: 000000004fb33b19 R12: 0000000000000000 R13: ffff88803b776230 R14: 0000000000000001 R15: 0000000000000246 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56 spin_lock_bh include/linux/spinlock_rt.h:90 [inline] some_qdisc_is_busy net/sched/sch_generic.c:1352 [inline] dev_deactivate_many+0xaeb/0xdb0 net/sched/sch_generic.c:1404 dev_deactivate net/sched/sch_generic.c:1419 [inline] dev_qdisc_change_tx_queue_len+0x185/0x530 net/sched/sch_generic.c:1475 netif_change_tx_queue_len+0x184/0x290 net/core/dev.c:9934 do_setlink+0xf9c/0x4670 net/core/rtnetlink.c:3238 rtnl_group_changelink net/core/rtnetlink.c:3863 [inline] __rtnl_newlink net/core/rtnetlink.c:4031 [inline] rtnl_newlink+0x148e/0x1bd0 net/core/rtnetlink.c:4159 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7f5/0x990 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x565/0x870 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b7/0x290 net/socket.c:2773 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: 0033:0x7fe14cbfce59 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:00007fe14ae4e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe14ce75fa0 RCX: 00007fe14cbfce59 RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000004 RBP: 00007fe14cc92e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe14ce76038 R14: 00007fe14ce75fa0 R15: 00007ffd36b83658 ---------------- 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 47 51 03 03 call 0x3035158 11: 89 c5 mov %eax,%ebp 13: e8 c0 89 ff ff call 0xffff89d8 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 70 0c ed 0d lea 0xded0c70(%rip),%rdi # 0xded0c98 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 c2 6b 89 09 jmp 0x9896bf8 36: cc int3 37: 48 c7 c7 85 d9 7b 8d mov $0xffffffff8d7bd985,%rdi 3e: e8 .byte 0xe8 3f: d5 .byte 0xd5