syzbot

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BUG: KCSAN: data-race in br_handle_frame_finish / br_handle_frame_finish

write to 0xffff888121b54148 of 8 bytes by interrupt on cpu 0:
 br_handle_frame_finish+0x7bf/0xa90 net/bridge/br_input.c:142
 br_nf_hook_thresh+0x1f8/0x210 net/bridge/br_netfilter_hooks.c:1019
 br_nf_pre_routing_finish+0x57c/0x810 net/bridge/br_netfilter_hooks.c:422
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 br_nf_pre_routing+0x660/0xd75 net/bridge/br_netfilter_hooks.c:531
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:224 [inline]
 br_handle_frame+0x432/0x890 net/bridge/br_input.c:349
 __netif_receive_skb_core+0xc6d/0x1ed0 net/core/dev.c:5051
 __netif_receive_skb_one_core+0x67/0xe0 net/core/dev.c:5148
 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5264
 process_backlog+0x207/0x4b0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff888121b54148 of 8 bytes by interrupt on cpu 1:
 br_handle_frame_finish+0x7ac/0xa90 net/bridge/br_input.c:142
 br_nf_hook_thresh+0x1f8/0x210 net/bridge/br_netfilter_hooks.c:1019
 br_nf_pre_routing_finish_ipv6+0x3cb/0x520 net/bridge/br_netfilter_ipv6.c:206
 NF_HOOK include/linux/netfilter.h:307 [inline]
 br_nf_pre_routing_ipv6+0x23a/0x340 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0xaf8/0xd75 net/bridge/br_netfilter_hooks.c:505
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:224 [inline]
 br_handle_frame+0x432/0x890 net/bridge/br_input.c:349
 __netif_receive_skb_core+0xc6d/0x1ed0 net/core/dev.c:5051
 __netif_receive_skb_one_core+0x67/0xe0 net/core/dev.c:5148
 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5264
 process_backlog+0x207/0x4b0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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