yep, I fully agree. I could not reproduce it with standalone app.
actual app injects its own sockets, filesystem and i have also customized kerberos build. Also, several threads (each with easy handle and one single thread on select) and several parallel http requests are running and it happens in the midst of them.
so, it is hard to reproduce it in standalone case (i did build standalone app and it works fine). one of my theories is that Curl uses preconnected sockets in such a way that somewhere socket state is not taken into account. i patched Curl in few places hoping to fix it, but it di not help.
i decided to wait for 7.39. my migration from 7.24 to 7.37 is already a big jump.
however, i will keep thinking and experimenting and let you immediately if I find something...
but in any case, thanks for following up abd helping :)

> On 21 Oct 2014, at 23:36, Daniel Stenberg <daniel_at_haxx.se> wrote:
>
>> On Wed, 15 Oct 2014, Alibek Joraev wrote:
>>
>> I tried my test with Curl 7.37.0 and it works fine. so this problem occurs
>> only in 7.38.0
>
> Exactly, that's because commit a4cece3d47cf was made for 7.38.0. We've already concluded that.
>
> The question is why it fails, or how it should be fixed. I can't repeat your problem and you haven't described it with details enough for me to figure it out in my end.
>
> --
>
> / daniel.haxx.se
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Received on 2014-10-23