I've gotten a bit further.
As you recall, calling libssh2_trace(session, ~0);
(all debugging enabled) caused so much output to be generated that the
timing changed, and the hang during the SFTP upload went away.
So, I disabled various combinations of trace flags until I got the hang to
reappear.
Now I'm enabling just LIBSSH2_TRACE_ERROR.
I changed the last line of sftp_write in sftp.c to:
return _libssh2_error(session, LIBSSH2_ERROR_EAGAIN,
"Would block at end of sftp_write");
During the last write, the program now gets this:
...
libssh2_sftp_write 2 sent 8000 bytes [This is a successful write]
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.245994 Failure Event: -37 - Unable to send channel data
[libssh2] 1.245994 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.261619 Failure Event: -37 - Unable to send channel data
[libssh2] 1.261619 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.277244 Failure Event: -37 - Unable to send channel data
[libssh2] 1.277244 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.292869 Failure Event: -37 - Unable to send channel data
[libssh2] 1.292869 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.308494 Failure Event: -37 - Unable to send channel data
[libssh2] 1.308494 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.308494 Failure Event: -37 - Unable to send channel data
[libssh2] 1.308494 Failure Event: -37 - Would block at end of sftp_write
[libssh2] 1.308494 Failure Event: -37 - Would block at end of sftp_write
Every time I run it, it logs "Would block at end of sftp_write"
twice immediately before hanging.
A clue?
Mark
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