On 4/14/2016 8:28 AM, Alex Lyakas wrote:
> Hello again, Daniel,
>
> I was asked to emphasize the fact that we use several threads, and
> each thread has its own multi-handle. So we are doing multi-threaded
> transfers, while each thread operates on its own multi-handle. Does
> such usage require providing these SSL callbacks?
>
> Thanks,
> Alex.
>
> -----Original Message----- From: Alex Lyakas
> Sent: Thursday, April 14, 2016 2:40 PM
> To: Daniel Stenberg
> Cc: libcurl hacking ; Yaron Presente
> Subject: Re: libcurl segfaults in curl_multi_perform
>
> Hello Daniel,
>
> We have found out that we did not provide the "locking_function" and the
> "threadid_func" to openSSL (and we are using https), as showin in
> https://curl.haxx.se/libcurl/c/threaded-ssl.html.
> Could this explain these crashes that we see from time to time? We are
> using
> curl_multi_perform/curl_multi_wait and each multi-handle is accessed by a
> single thread only.
>
> Thanks,
> Alex.
>
>
>
> -----Original Message----- From: Daniel Stenberg
> Sent: Thursday, March 24, 2016 1:50 PM
> To: Alex Lyakas
> Cc: libcurl hacking
> Subject: Re: libcurl segfaults in curl_multi_perform
>
> On Thu, 24 Mar 2016, Alex Lyakas wrote:
>
>> We upgraded the libcurl to 7.45.0. After several weeks, the same or
>> very similar problem happened 3 times within 24 hours, unfortunately.
>
> Did you upgrade OpenSSL? It looks more like a problem in OpenSSL so I
> suspect
> just upgrading libcurl won't help for this.
>
> Further, if the problem remains I think you should consider building
> custom
> versions of libcurl and openssl with debug systems present so that future
> crashes get more details provided. I'd also urge you to try to come up
> with
> a
> way to reproduce the problem since just randomly occuring crashes are
> notoriously hard to work with.
>

Yes as mentioned [1]. That applies to OpenSSL <= 1.0.2, in the upcoming
1.1 the callbacks may not be required.

[1]: https://curl.haxx.se/mail/lib-2016-03/0212.html

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Received on 2016-04-14