Bug 159191

Summary:	Apache child infinite loop
Product:	Red Hat Enterprise Linux 4	Reporter:	Joe Orton <jorton>
Component:	apr-util	Assignee:	Joe Orton <jorton>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
URL:	http://issues.apache.org/bugzilla/show_bug.cgi?id=34708
Whiteboard:
Fixed In Version:	RHBA-2005-622	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-10-05 15:38:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	156322

Description Joe Orton 2005-05-31 10:44:03 UTC

+++ This bug was initially created as a clone of Bug #137306 +++

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20040914
Firefox/0.10.1

Description of problem:
An httpd process was consuming 100% cpu for hours.

Strace showed an infinite loop of this:

lseek(14, 12964, SEEK_SET)              = 12964
read(14, "", 49)                        = 0
lseek(14, 12964, SEEK_SET)              = 12964
read(14, "", 49)                        = 0
lseek(14, 12964, SEEK_SET)              = 12964
read(14, "", 49)                        = 0
lseek(14, 12964, SEEK_SET)              = 12964
read(14, "", 49)                        = 0

lsof showed file #14 to be a 12964 byte .jpg file that is served
thousands of times per day.

gdb of the process showed this:

(gdb) where
#0  0x0000002a96dd0229 in lseek () from /lib64/tls/libpthread.so.0
#1  0x0000002a966c3c2b in apr_file_seek () from /usr/lib64/libapr-0.so.0
#2  0x0000002a962b44e0 in apr_bucket_pool_create () from
/usr/lib64/libaprutil-0.so.0
#3  0x0000002a9774f101 in ssl_init_ModuleKill () from
/etc/httpd/modules/mod_ssl.so
#4  0x00000000004319d2 in ap_pass_brigade ()
#5  0x000000000042139f in ap_http_header_filter ()
#6  0x00000000004319d2 in ap_pass_brigade ()
#7  0x0000000000433ed4 in ap_content_length_filter ()
#8  0x00000000004319d2 in ap_pass_brigade ()
#9  0x0000000000422f32 in ap_byterange_filter ()
#10 0x00000000004319d2 in ap_pass_brigade ()
#11 0x0000002a975361fe in ?? () from /etc/httpd/modules/mod_headers.so
#12 0x00000000004319d2 in ap_pass_brigade ()
#13 0x0000002a97c86894 in ?? () from /etc/httpd/modules/mod_expires.so
#14 0x00000000004319d2 in ap_pass_brigade ()
#15 0x0000000000439378 in ap_core_translate ()
#16 0x000000000042654e in ap_run_handler ()
#17 0x0000000000426b99 in ap_invoke_handler ()
#18 0x00000000004236a2 in ap_process_request ()
#19 0x000000000041f36c in _start ()
#20 0x000000000042f8a7 in ap_run_process_connection ()
#21 0x0000000000424cd8 in ap_graceful_stop_signalled ()
#22 0x0000000000424e08 in ap_graceful_stop_signalled ()
#23 0x0000000000425029 in ap_graceful_stop_signalled ()
#24 0x00000000004255e1 in ap_mpm_run ()
#25 0x000000000042b379 in main ()

Thanks for looking at this.


Version-Release number of selected component (if applicable):
httpd-2.0.46-40.ent

How reproducible:
Couldn't Reproduce

Steps to Reproduce:
1. Unable to
2.
3.
    
Additional info:

Comment 2 dff 2005-06-08 17:02:10 UTC

PM Ack for U2 CanFix, though not sure there are enough issues for httpd to
justify an errata?

Comment 6 Red Hat Bugzilla 2005-10-05 15:38:07 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2005-622.html