# Re: \[PATCH v3 net 0/5\] ipv6: Fix dst\_entry refcnt bugs in ip6\_tunnel

- From: David Miller \<davem@davemloft.net\>
- Date: 2015-09-15 02:49:28 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/09/10996450
- Thread: https://ratatoskr.run/netdev/2015/09/10996380/t.md

```text
From: Martin KaFai Lau <redacted>
Date: Fri, 11 Sep 2015 11:06:16 -0700

> v3:
> - Merge a 'if else if' test in patch 4
> - Use rcu_dereference_protected in patch 5 to fix a sparse check when
>   CONFIG_SPARSE_RCU_POINTER is enabled
> 
> v2:
> - Add patch 4 and 5 to remove the spinlock
> 
> v1:
> This patch series is to fix the dst refcnt bugs in ip6_tunnel.
> 
> Patch 1 and 2 are the prep works.  Patch 3 is the fix.
> 
> I can reproduce the bug by adding and removing the ip6gre tunnel
> while running a super_netperf TCP_CRR test.  I get the following
> trace by adding WARN_ON_ONCE(newrefcnt < 0) to dst_release():
 ...

Series applied, thanks Martin.
```