Messages in this thread | | | Date | Wed, 30 Sep 2015 22:39:58 -0400 | From | Jason Baron <> | Subject | Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket |
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On 09/30/2015 01:54 AM, Mathias Krause wrote: > On 29 September 2015 at 21:09, Jason Baron <jbaron@akamai.com> wrote: >> However, if we call connect on socket 's', to connect to a new socket 'o2', we >> drop the reference on the original socket 'o'. Thus, we can now close socket >> 'o' without unregistering from epoll. Then, when we either close the ep >> or unregister 'o', we end up with this list corruption. Thus, this is not a >> race per se, but can be triggered sequentially. > > Sounds profound, but the reproducers calls connect only once per > socket. So there is no "connect to a new socket", no? > But w/e, see below.
Yes, but it can be reproduced this way too. It can also happen with a close() on the remote peer 'o', and a send to 'o' from 's', which the reproducer can do as pointed out Michal. The patch I sent deals with both cases.
Thanks,
-Jason
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