Bugs item #2844110, was opened at 2009-08-25 10:47
Message generated for change (Tracker Item Submitted) made by chrullrich
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Category: libcurl
Group: bad behaviour
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Christian Ullrich (chrullrich)
Assigned to: Daniel Stenberg (bagder)
Summary: 7.19.6: Uploads from stdin stall

Initial Comment:
On FreeBSD 7.1 and 7.2, since cURL 7.19.6, FTP uploads from stdin ("--upload-file -") stall. The specific circumstances are:

- cURL is reading from stdin, which is a pipe
- cURL reads data from the pipe faster than the pipe writer can provide it

The transfer will stall as soon as cURL exhausts the pipe for the first time (read() will return -1, errno will be EAGAIN). From this point forward, cURL will attempt no further reads. The amount of data transferred varies widely, from zero up to many MB.

This does not happen if stdin is an input redirection from an existing file.

Artificially slowing down cURL, for example by attaching a process trace, will in some cases allow the transfer to complete. "nice -n 19", on an otherwise unloaded system, will not help.

This behavior started with the upgrade from cURL 7.19.5 to 7.19.6 on the affected system. Reverting to version 7.19.5 solved the problem.

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Received on 2009-08-27