https://issues.apache.org/bugzilla/show_bug.cgi?id=46632
Summary: mod_jk's sockets close prematurely when the server forks
a child
Product: Tomcat Connectors
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_jk
AssignedTo: dev@tomcat.apache.org
ReportedBy: jles...@placebase.com
mod_jk registers its cleanup handler to be called both during plain_cleanup and
child_cleanup:
apr_pool_cleanup_register(p, s, jk_apr_pool_cleanup, jk_apr_pool_cleanup);
So, whenever a server forks a child, ie, when mod_cgi creates its child
process, jk_apr_pool_cleanup() gets called. jk_apr_pool_cleanup() does a
shutdown() on its sockets, which closes down the socket for the parent process.
Maybe it should use close() instead of shutdown(), or be registered as
apr_pool_cleanup_register(p, s, jk_apr_pool_cleanup, jk_apr_pool_cleanup_null);
?
Note, with mod_jk 1.2.18, a load balancing worker isn't able to recover from
this, and it brings down the whole LB worker for awhile. 1.2.27 seems to be
able to recover.
After a CGI is hit and jk's sockets get closed underneath it, the logs look
like:
[Wed Jan 28 21:39:50 2009] [22841:42432] [info]
ajp_send_request::jk_ajp_common.c (1178): Socket 75 is not connected any more
(errno=-1)
[Wed Jan 28 21:39:50 2009] [22841:42432] [info]
ajp_send_request::jk_ajp_common.c (1202): Error sending request. Will try
another pooled connection
[Wed Jan 28 21:39:50 2009] [22841:42432] [info]
ajp_send_request::jk_ajp_common.c (1224): All endpoints are disconnected or
dead
[Wed Jan 28 21:39:50 2009] [22841:42432] [info] ajp_service::jk_ajp_common.c
(1783): Sending request to tomcat failed, recoverable operation attempt=1
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