https://bz.apache.org/bugzilla/show_bug.cgi?id=63797
Bug ID: 63797
Summary: httpd 2.4.41 does not handle large CGI PIPES output
correctly.
Product: Apache httpd-2
Version: 2.4.41
Hardware: PC
URL: https://bugzilla.redhat.com/show_bug.cgi?id=1757196
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: mod_cgi
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
In basic terms:
if a cgi script is sending a big chunk of data, like a pdf file ( >500kb tested
),
the handling httpd process does not take that data and stops working.
Result: stuck cgi scripts, stapling on the host, because the never die.
The cgi script process, in our case a php script, sent a the content of a pdf
file to the user. It got stuck on a write() call with >500k data chunk.
strace and ltrace confirmed, that the sending php script got stuck in write(),
unfortunatly it's a production server and after fixing it with a downgrade, i
can't give you the strace output anymore.
You find more details about the server setup in the fedora bugreport.
Small chunks of data where processed correctly. It's all about big chunks of
data.
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