bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) ================================================================== BUG: KCSAN: data-race in br_fdb_update / br_fdb_update write to 0xffff88810431a640 of 8 bytes by interrupt on cpu 0: br_fdb_update+0x142/0x480 net/bridge/br_fdb.c:904 br_handle_frame_finish+0x338/0xe90 net/bridge/br_input.c:144 br_nf_hook_thresh+0x1e5/0x220 br_nf_pre_routing_finish_ipv6+0x575/0x5a0 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x1f6/0x2a0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x517/0xbc0 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:282 [inline] br_handle_frame+0x4e0/0x9b0 net/bridge/br_input.c:433 __netif_receive_skb_core+0xb1a/0x2350 net/core/dev.c:5793 __netif_receive_skb_one_core net/core/dev.c:5897 [inline] __netif_receive_skb+0x5a/0x280 net/core/dev.c:6012 process_backlog+0x22e/0x440 net/core/dev.c:6360 __napi_poll+0x63/0x3c0 net/core/dev.c:7194 napi_poll net/core/dev.c:7263 [inline] net_rx_action+0x3a1/0x7f0 net/core/dev.c:7385 handle_softirqs+0xbf/0x280 kernel/softirq.c:561 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:950 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164 kthread+0x4ae/0x520 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 read to 0xffff88810431a640 of 8 bytes by interrupt on cpu 1: br_fdb_update+0x10e/0x480 net/bridge/br_fdb.c:903 br_handle_frame_finish+0x338/0xe90 net/bridge/br_input.c:144 nf_hook_bridge_pre net/bridge/br_input.c:304 [inline] br_handle_frame+0x5af/0x9b0 net/bridge/br_input.c:433 __netif_receive_skb_core+0xb1a/0x2350 net/core/dev.c:5793 __netif_receive_skb_one_core net/core/dev.c:5897 [inline] __netif_receive_skb+0x5a/0x280 net/core/dev.c:6012 process_backlog+0x22e/0x440 net/core/dev.c:6360 __napi_poll+0x63/0x3c0 net/core/dev.c:7194 napi_poll net/core/dev.c:7263 [inline] net_rx_action+0x3a1/0x7f0 net/core/dev.c:7385 handle_softirqs+0xbf/0x280 kernel/softirq.c:561 do_softirq+0x5e/0x90 kernel/softirq.c:462 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:389 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] addrconf_ifdown+0x3b7/0xed0 net/ipv6/addrconf.c:3903 addrconf_notify+0x2ff/0x950 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:453 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:2212 call_netdevice_notifiers_extack net/core/dev.c:2250 [inline] call_netdevice_notifiers net/core/dev.c:2264 [inline] unregister_netdevice_many_notify+0x98a/0x1280 net/core/dev.c:11890 unregister_netdevice_many net/core/dev.c:11954 [inline] default_device_exit_batch+0x500/0x560 net/core/dev.c:12437 ops_exit_list net/core/net_namespace.c:177 [inline] setup_net+0x474/0x600 net/core/net_namespace.c:394 copy_net_ns+0x55a/0x6f0 net/core/net_namespace.c:516 create_new_namespaces+0x228/0x430 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xe6/0x120 kernel/nsproxy.c:228 ksys_unshare+0x3c9/0x6e0 kernel/fork.c:3342 __do_sys_unshare kernel/fork.c:3413 [inline] __se_sys_unshare kernel/fork.c:3411 [inline] __x64_sys_unshare+0x1f/0x30 kernel/fork.c:3411 x64_sys_call+0x1a3e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:273 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffff245 -> 0x00000000fffff246 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 5961 Comm: syz-executor Not tainted 6.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== net_ratelimit: 44684 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:fe:79:f9:73:97:d1, vlan:0)