================================================================== BUG: KCSAN: data-race in br_handle_frame_finish / br_handle_frame_finish read-write to 0xffff8881036b6170 of 8 bytes by interrupt on cpu 1: br_handle_frame_finish+0xb14/0xbc0 net/bridge/br_input.c:172 br_nf_hook_thresh+0x1ee/0x220 br_nf_pre_routing_finish_ipv6+0x4fa/0x510 NF_HOOK include/linux/netfilter.h:302 [inline] br_nf_pre_routing_ipv6+0x1ea/0x280 net/bridge/br_netfilter_ipv6.c:237 br_nf_pre_routing+0x4c9/0xb20 net/bridge/br_netfilter_hooks.c:507 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_bridge_pre net/bridge/br_input.c:255 [inline] br_handle_frame+0x483/0x7d0 net/bridge/br_input.c:399 __netif_receive_skb_core+0xa4e/0x1ce0 net/core/dev.c:5383 __netif_receive_skb_one_core net/core/dev.c:5487 [inline] __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5603 process_backlog+0x23f/0x3b0 net/core/dev.c:5931 __napi_poll+0x65/0x390 net/core/dev.c:6498 napi_poll net/core/dev.c:6565 [inline] net_rx_action+0x37e/0x730 net/core/dev.c:6676 __do_softirq+0xf2/0x2c7 kernel/softirq.c:571 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:934 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 read-write to 0xffff8881036b6170 of 8 bytes by interrupt on cpu 0: br_handle_frame_finish+0xb14/0xbc0 net/bridge/br_input.c:172 br_nf_pre_routing_finish+0x8e4/0xcb0 net/bridge/br_netfilter_hooks.c:424 NF_HOOK include/linux/netfilter.h:302 [inline] br_nf_pre_routing+0x9ee/0xb20 net/bridge/br_netfilter_hooks.c:533 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_bridge_pre net/bridge/br_input.c:255 [inline] br_handle_frame+0x483/0x7d0 net/bridge/br_input.c:399 __netif_receive_skb_core+0xa4e/0x1ce0 net/core/dev.c:5383 __netif_receive_skb_one_core net/core/dev.c:5487 [inline] __netif_receive_skb+0x52/0x1b0 net/core/dev.c:5603 process_backlog+0x23f/0x3b0 net/core/dev.c:5931 __napi_poll+0x65/0x390 net/core/dev.c:6498 napi_poll net/core/dev.c:6565 [inline] net_rx_action+0x37e/0x730 net/core/dev.c:6676 __do_softirq+0xf2/0x2c7 kernel/softirq.c:571 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:934 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 value changed: 0x000000000004bed4 -> 0x000000000004bed5 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 6.1.0-rc4-syzkaller-00356-g8f2975c2bb4c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 ================================================================== bridge0: received packet on veth0_to_bridge with own address as source address (addr:24:02:48:ff:05:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:24:02:48:ff:05:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:24:02:48:ff:05:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:24:02:48:ff:05:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:24:02:48:ff:05:00, vlan:0)