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Re: [libmicrohttpd] [PATCH] epoll: add locking around eready DLL

From: Christian Grothoff
Subject: Re: [libmicrohttpd] [PATCH] epoll: add locking around eready DLL
Date: Tue, 15 Mar 2016 20:21:51 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0

0.9.34 is rather ancient (see ChangeLog for list of issues resolved
since...).  So you might just want to update first and then see if you
can still reproduce anything...

On 03/15/2016 08:17 PM, Dan Dedrick wrote:
> I actually did see a SIGSEGV in EDLL_insert() on "(head)->prevE =
> element;". tail was a valid pointer but the value for head was NULL. When I
> look at the coredump though I see that the head and tail are both valid
> pointers at this point and they point to a different connection pointer
> than the one we were looking to add. I can see that there are 2 threads in
> this process in MHD_handle_connection() for the same daemon. It might be
> worth noting that this is running with MHD_USE_THREAD_PER_CONNECTION where
> as far as I can see does share a daemon structure across multiple threads.
> Where this failed it was running 0.9.34 of libmicrohttpd. I'm going to dig
> in to see if I can see how this could get into this state.

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