Re: [PATCH net v5] ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Wed, 13 May 2026 10:55:09 +0800 you wrote:
> addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD
> via addrconf_dad_end(), which drops ifp->lock on return.  The lock
> is re-acquired after net_info_ratelimited().  A concurrent
> ipv6_del_addr() can take the lock in that window, set ifp->state
> to DEAD and run list_del_rcu(&ifp->if_list).
> 
> addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:
> and schedules a new dad_work.  The work calls ipv6_del_addr()
> again, hitting the already-poisoned list entry:
> 
> [...]

Here is the summary with links:
  - [net,v5] ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
    https://git.kernel.org/netdev/net-next/c/627ac78f2741

You are awesome, thank you!
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