# Re: \[PATCH net\] ipv6: use RCU iterator to dump route exceptions

- From: patchwork-bot+netdevbpf@kernel.org
- Date: 2026-08-19 08:11:04 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/08/17432682
- Thread: https://ratatoskr.run/netdev/2026/08/17416364/t.md

```text
Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller [ref]:

On Sat, 15 Aug 2026 17:46:51 +0900 you wrote:
> rt6_nh_dump_exceptions() uses hlist_for_each_entry() to iterate over
> RCU-protected exception lists. The caller holds rcu_read_lock(), but does
> not hold rt6_exception_lock, so rt6_insert_exception() can concurrently
> add an entry with hlist_add_head_rcu().
> 
> KCSAN reports this race (irrelevant details omitted):
> 
> [...]

Here is the summary with links:
  - [net] ipv6: use RCU iterator to dump route exceptions
    https://git.kernel.org/netdev/net/c/564973a259ec

You are awesome, thank you!
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```