Received: (qmail 47959 invoked by uid 501); 20 Jan 2001 03:45:04 -0000 Message-Id: <20010120034504.47958.qmail@apache.org> Date: 20 Jan 2001 03:45:04 -0000 From: Cott Lang Reply-To: cott@internetstaff.com To: submit@bugz.apache.org Subject: very sporadically httpd processes peg the cpu X-Send-Pr-Version: 3.110 >Number: 7105 >Category: mod_rewrite >Synopsis: very sporadically httpd processes peg the cpu >Confidential: no >Severity: serious >Priority: medium >Responsible: apache >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: apache >Arrival-Date: Fri Jan 19 19:50:00 PST 2001 >Closed-Date: >Last-Modified: Tue Jan 23 00:10:01 PST 2001 >Originator: cott@internetstaff.com >Release: 1.3.6-1.3.12 >Organization: apache >Environment: Solaris 7 x86, Sun cc compiler. >Description: Every few days, 1 or more webservers goes nuts with 1 or more processes consuming an entire processor. stack dumps (via pstack) make this appear to be a recursive regex call that goes nuts (although this is the COMPLETE stack dump - so it doesn't appear to recurse many times): dfb31ae5 match_re_C () + 208d dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb31523 match_re_C () + 1acb dfb31b02 match_re_C () + 20aa dfb30274 match_re_C () + 81c dfb2f992 __regexec_C (dfb53c2c, 819ad98, 80412ac, 2, 8041134, 0) + d2 dfb332de regexec () + 2e 080ad553 ap_regexec (819ad98, 80412ac, 2, 8041134, 0) + 17 08094c57 ???????? () 080940d7 ???????? () 08093c00 ???????? () 0809302b ???????? (81d59e8) 0809cc2b ???????? () 0809cc7b ap_translate_name (81d59e8) + 13 080ab400 ap_sub_req_method_uri () + dc 080ab50b ap_sub_req_lookup_uri () + 13 08091616 ???????? () 0809cf2a ap_invoke_handler () + 92 080abd73 ???????? () 080abece ap_process_request (81d39c8) + 2a 080a5554 ???????? (a, f, 80a41d4, 10, 80a41d4, 1) 080a56e0 ???????? () 080a5ccf ???????? () 080a62b5 ???????? (1, 8047c10, 816aae8, 816ab10) 080a687e main (1, 8047c10, 8047c18) + 346 08073c4c ???????? () I use a few relatively simple rewrite rules that activate on almost all URLs on a site that gets millions of hits a day. This has been going on for a year and a half, but sporadically enough that we've never pursued it. Sometimes it disappears for months, then occurs every day for weeks. At one time, I dumped core into gdb and debugged quite a few processes on different machines to check the URL getting passed into regexec - they were all VERY normal image or html calls that we process hundreds of thousands of times a day. I'm lost. I can't find any references to this problem anywhere. >How-To-Repeat: I have no idea - but it repeats for me regularly. I'm willing to do the legwork to help track it down, but I'm lost at this point. >Fix: nope. >Release-Note: >Audit-Trail: From: Tony Finch To: apbugs@apache.org Cc: Subject: Re: mod_rewrite/7105: very sporadically httpd processes peg the cpu Date: Tue, 23 Jan 2001 08:08:26 +0000 Cott Lang wrote: > >Every few days, 1 or more webservers goes nuts with 1 or more >processes consuming an entire processor. stack dumps (via pstack) >make this appear to be a recursive regex call that goes nuts. It isn't hard to write rewrite rules that may get into loops. Your bug report is basically useless as it is, because you have told us nothing about your configuration. Tony. -- f.a.n.finch fanf@covalent.net dot@dotat.at "Dead! And yet there he stands!" >Unformatted: [In order for any reply to be added to the PR database, you need] [to include in the Cc line and make sure the] [subject line starts with the report component and number, with ] [or without any 'Re:' prefixes (such as "general/1098:" or ] ["Re: general/1098:"). If the subject doesn't match this ] [pattern, your message will be misfiled and ignored. The ] ["apbugs" address is not added to the Cc line of messages from ] [the database automatically because of the potential for mail ] [loops. If you do not include this Cc, your reply may be ig- ] [nored unless you are responding to an explicit request from a ] [developer. Reply only with text; DO NOT SEND ATTACHMENTS! ]