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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/08/24 18:15:59 UTC
DO NOT REPLY [Bug 40310] New: - Ajp Connection handling causes unexpected results.
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Summary: Ajp Connection handling causes unexpected results.
Product: Apache httpd-2
Version: 2.2-HEAD
Platform: Other
OS/Version: All
Status: NEW
Severity: major
Priority: P2
Component: mod_proxy
AssignedTo: bugs@httpd.apache.org
ReportedBy: ianabel@mxtelecom.com
With an apahce proxying requests over ajp to a backend tomcat, the following
sequence of events is possible:
User1 requests /badger, and sends headers.
Request hits apache, filters into ap_proxy_ajp_request in mod_proxy_ajp.c
User1 terminates connection with extreme prejudice.
Apache sends headers to tomcat.
Tomcat takes it's time.
Apache tries to read the rest of the request body with ap_get_brigade,
mod_proxy_ajp.c:174. This fails as the underlying socket cannot recv any more.
So ap_proxy_ajp_request returns 500 immediatly. conn->close++ is not called so
the connection is not touched, merely put back in the available connections.
Apache now fails int he output filters trying to send the status 500 error
message.
Now user2 connects, requests /moose, apache takes the above connection from the
pool and sends the headers down the pipe to the tomcat.
The tomcat now returns /badger, as that's finally finished processing.
Apache in ajp_read_header reads the SEND_BODY_CHUNK message, and processes it.
Then repeats reading messages until the END_RESPONSE message.
Whereupon apache has successfully served /badger to someone who requested /
moose.
Needless to say this is a critical flaw with the ajp connection handling.
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
Posted by bu...@apache.org.
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------- Additional Comments From rpluem@apache.org 2006-08-24 19:52 -------
Well spotted! Committed to trunk as r434483
(http://svn.apache.org/viewvc?view=rev&revision=434483). Thanks for the patch.
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
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------- Additional Comments From ianabel@mxtelecom.com 2006-08-24 16:17 -------
Created an attachment (id=18750)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18750&action=view)
Patch that attempts to fix the bug
This patch _should_, if my understanding of the bug is correct , fix it.
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
Posted by bu...@apache.org.
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jfclere@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
------- Additional Comments From jfclere@gmail.com 2007-03-17 11:44 -------
The problem is still not fixed correctly in 2.2.4 (the worker is marked errored
and connection retried but that is wrong):
+++
Fri Mar 16 08:27:06 2007] [error] [client 71.140.198.6] proxy: error processing
body, referer: https://xxx.yyy.zzz/site/checkout/ship_method.html
[Fri Mar 16 08:27:06 2007] [error] proxy: got bad response (5) from
64.85.80.16:8009 (app4)
[Fri Mar 16 08:27:06 2007] [error] proxy: BALANCER: (balancer://appservers). All
workers are in error state for route (app4-engine1)
+++
I have fixed it in trunk.
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
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------- Additional Comments From jfclere@gmail.com 2007-03-22 09:41 -------
Created an attachment (id=19772)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=19772&action=view)
patch for 2.2.x
I will commit it in the 2.2.x branch if noone complains.
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
Posted by bu...@apache.org.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
------- Additional Comments From rpluem@apache.org 2007-08-17 13:07 -------
Fix backported to 2.2.x as r553593
(http://svn.apache.org/viewvc?view=rev&revision=553593)
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
Posted by bu...@apache.org.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |PatchAvailable
------- Additional Comments From rpluem@apache.org 2006-08-24 19:58 -------
Proposed for backport to 2.2.x as r434488
http://svn.apache.org/viewvc?view=rev&revision=434488).
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DO NOT REPLY [Bug 40310] - Ajp Connection handling causes unexpected results.
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chuck.mcintyre@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |chuck.mcintyre@gmail.com
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------- Additional Comments From hatfield@uga.edu 2007-01-04 10:52 -------
I'd like to add that in our shop we witnessed this exact same problem with
Apache 2.2.3 and mod_jk 1.2.19, not mod_proxy_ajp. Will the fix being applied
cure this problem when using mod_jk or is a seperate patch going to be applied
to that module as well?
Thanks.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
------- Additional Comments From rpluem@apache.org 2007-01-04 11:40 -------
No this will not cure mod_jk. Bugs for mod_jk should not be further handled in
this report. Please open a new report with Product: Tomcat 5 and Component:
Native:JK.
BTW: The fix for the original bug will be part of 2.2.4 as it has been backported.
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