Bug 102005 - child httpd hangs when cgi prints more than 4096 bytes to stderr
child httpd hangs when cgi prints more than 4096 bytes to stderr
Status: CLOSED UPSTREAM
Product: Red Hat Linux
Classification: Retired
Component: httpd (Show other bugs)
9
i386 Linux
medium Severity high
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Assigned To: Joe Orton
Brian Brock
http://nagoya.apache.org/bugzilla/sho...
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2003-08-08 15:49 EDT by Luiz
Modified: 2007-04-18 12:56 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2003-09-11 10:44:41 EDT
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Attachments (Terms of Use)
CGI source code (254 bytes, text/plain)
2003-08-08 15:51 EDT, Luiz
no flags Details

  None (edit)
Description Luiz 2003-08-08 15:49:14 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030711

Description of problem:
A CGI (and its parent httpd) hangs while printing long strings with more than
4096 bytes to stderr.

Multiple small strings on printf have the same effect as a single long string in
printf.




Version-Release number of selected component (if applicable):
httpd-2.0.40-21.3

How reproducible:
Always

Steps to Reproduce:
1. gcc -o /var/www/cgi-bin/apbuf.cgi apbuf.c
2. wget http://localhost/cgi-bin/apbuf.cgi

    

Actual Results:  Both the cgi and its parent httpd hanged.

# strace -p `pidof apbuf.cgi`
write(2, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 4097 <unfinished ...>

# strace -p 22412
poll( <unfinished ...>

(22412 was apbuf.cgi parent)

Even after killing wget with ctrl-c:
#pstree     
(...)
     &#9500;&#9472;httpd&#9472;&#9516;&#9472;7*[httpd]
     &#9474;       &#9492;&#9472;httpd&#9472;&#9472;&#9472;apbug.cgi
(...)

Nothing is appended to error_log.

Expected Results:  wget should save apbug.cgi file with an "ok",
apache should append a line with 4097 A's to error_log.

Additional info:

LANG="en_US.UTF-8"
SUPPORTED="en_US.UTF-8:en_US:en"
LC_COLLATE="C"
Comment 1 Luiz 2003-08-08 15:51:32 EDT
Created attachment 93535 [details]
CGI source code
Comment 2 Joe Orton 2003-09-11 10:44:41 EDT
This is a known design issue with mod_cgi in httpd 2.0.x; I'll defer to the
upstream bug, there is no simple fix we can integrate.  Thanks for the report.

http://nagoya.apache.org/bugzilla/show_bug.cgi?id=22030

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