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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 32578] New: - writing to stderr from CGIs can silently block processing
Date Wed, 08 Dec 2004 05:17:54 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32578

           Summary: writing to stderr from CGIs can silently block
                    processing
           Product: Apache httpd-2.0
           Version: 2.0.48
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Platform
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: mitch@degana.com


I just spent several days tracking down this problem.

Running Linux, Apache 2.0.48.  My application is written in C (embedded system) that was writing

debug information to stderr.

Long story short, I observed repeatable behavior that after perhaps a few KB of information,
my 
application would hang.  Attaching with gdb indicated it was stuck down in libc, trying to
write to 
stderr.

After 300 seconds, my process would be killed.

I can understand the desire to not allow CGI applications to fill error_log; so perhaps that
is why 
httpd stops servicing the stderr pipe.  Or perhaps that is the real bug.

Assuming the former, It would have saved me a ton of energy if there had been a line in error_log

indicating that the application had written too much data to stderr and would be killed. 
It also 
seems that if the application is no longer going to be serviced, it should be killed right
away.

Thanks for your time.
-Mitch

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