https://issues.apache.org/bugzilla/show_bug.cgi?id=51235
Bug #: 51235
Summary: Access Violation in httpd.exe originating in mod_jk
code while getting sessionid from headers
Product: Tomcat Connectors
Version: 1.2.28
Platform: PC
OS/Version: Windows Server 2003
Status: NEW
Severity: major
Priority: P2
Component: mod_jk
AssignedTo: dev@tomcat.apache.org
ReportedBy: pierre.boudr...@t4g.com
Classification: Unclassified
Created attachment 27041
--> https://issues.apache.org/bugzilla/attachment.cgi?id=27041
Screen shots of one of crash dumps in Visual Studio 2010 debugger
This happens in our production environment almost every day. It causes the
Apache httpd.exe process to crash and restart itself.
The error shows up in the Windows event log as:
Faulting application httpd.exe, version 2.2.17.0, faulting module msvcrt.dll,
version 7.0.3790.3959, fault address 0x00038bab.
We have not been able to reproduce it with tests, but we do have several crash
dumps that can be used to debug.
The fault is always in exactly the same spot in the mod_jk code. I opened one
of the crash dumps in Visual Studio 2010 and tried to find the problem. I
found that the code is going out of bounds of an array in get_sessionid() in
jk_lb_worker.c because the num_headers in jk_ws_service_t that gets passed in
ot the get_sessionid method is bigger than the actual number of headers in
header_names and header_values. See ApacheCrash_2.png in the attached zip
file. I don't know how it got this way though...
I can provide crash dumps to someone who can look into this. We get new ones
regularly.
Configuration:
2 load balanced web servers running httpd 2.2.17 mod_jk 1.2.28 on Windows
Server 2003
6 JBOSS 4.2 workers running ATG 9.0 application using mod_jk loadbalancer
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