On Tue, 5 Mar 2019, Ketul Barot via curl-library wrote:
The hang doesn't happen always but it does only happen when I return (or abort the transfer) due to a timeout
I think that sounds as if we can leave libssh2 in a bad state so when we timeout and call another libssh2 function to cleanup, something from the previous situation somehow still lingers.
When this happens, as it is during an SFTP upload, do you think libssh2_sftp_write() was the last libssh2 function call before the timeout triggered (it is called from the lib/ssh.c:sftp_send() function)? If so, can you log the return code from that and see if you can detect a pattern in the hang and what the last return code from that is?
I don't remember if you told us, but you are using a recent libssh2 version, right? Have you checked the version from the libssh2 git repo?
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