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Bug 1656482 - Apache httpd fails to start because of "worker slotmem_create failed"
Summary: Apache httpd fails to start because of "worker slotmem_create failed"
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: apr
Version: 7.7
Hardware: x86_64
OS: Linux
urgent
urgent
Target Milestone: rc
: ---
Assignee: Luboš Uhliarik
QA Contact: Maryna Nalbandian
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-12-05 15:37 UTC by Tomás Briceño
Modified: 2021-01-14 09:34 UTC (History)
6 users (show)

Fixed In Version: apr-1.4.8-5.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-06 13:10:55 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Apache Bugzilla 53996 0 None None None 2019-08-06 02:08:22 UTC
Red Hat Product Errata RHBA-2019:2254 0 None None None 2019-08-06 13:10:56 UTC

Description Tomás Briceño 2018-12-05 15:37:15 UTC 
Description of problem:
Apache httpd fails to start. Error log shows:
[Thu Nov 15 11:51:58.368671 2018] [slotmem_shm:debug] [pid 3703899:tid 139787633764480] mod_slotmem_shm.c(339): AH02300: create /myc/httpd/run/myc01/slotmem-shm-peadc331_www_ws4_dev_mycompany_com.shm: 672/3
[Thu Nov 15 11:51:58.368724 2018] [proxy_balancer:emerg] [pid 3703899:tid 139787633764480] (17)File exists: AH01185: worker slotmem_create failed
[Thu Nov 15 11:51:58.368747 2018] [:emerg] [pid 3703899:tid 139787633764480] AH00020: Configuration Failed, exiting 

Strace shows:
3144330 13:29:59.954649 stat("/myc/httpd/run/myc01/slotmem-shm-peadc331_www_ws4_dev_mycompany_com.shm", {st_dev=makedev(253, 17), st_ino=1573573, st_mode=S_IFREG|0644, st_nlink=1, st_uid=603236, st_gid=134127, st_blksize=4096, st_blocks=0, st_size=0, st_atime=2018/11/28-13:29:59.954278215, st_mtime=2018/11/28-13:29:59.954278215, st_ctime=2018/11/28-13:29:59.954278215}) = 0
3144330 13:29:59.954687 shmget(0x11102c5, 2043, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists)

After further debugging segment "0x11102c5" is already owned by a different instance of httpd.

This appears to be an instance of Apache httpd community issue:
https://bz.apache.org/bugzilla/show_bug.cgi?id=53996

This is fixed in Apache Portable Runtime 1.5.1, however RHEL 7 Apache httpd (2.4.6) ships with APR 1.4.8.


Version-Release number of selected component (if applicable):
1.4.8


How reproducible:
The issue is heavily environmental so there are no reproduction steps.


Steps to Reproduce:
N/A

Actual results:
N/A

Expected results:
N/A

Additional info:
N/A
Comment 3 Tomás Briceño 2019-02-20 09:50:12 UTC 
This seems another flavor of the same issue:
[Wed Feb 20 08:34:44.867814 2019] [core:crit] [pid 21119:tid 139978256164992] (17)File exists: AH00001: unable to create or access scoreboard "/opt/local/app/alb/runtime/this/myserver/server.scoreboard" (name-based shared memory failure)

From strace:
21119 08:34:44 stat("/opt/local/app/alb/runtime/this/myserver/server.scoreboard", {st_dev=makedev(253, 2), st_ino=4194385, st_mode=S_IFREG|0640, st_nlink=1, st_uid=307, st_gid=300, st_blksize=4096, st_blocks=0, st_size=0, st_atime=2019/02/20-08:34:44.867110011, st_mtime=2019/02/20-08:34:44.867110011, st_ctime=2019/02/20-08:34:44.867110011}) = 0 <0.000019>
21119 08:34:44 shmget(0x1020051, 254488, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists) <0.000011>
Comment 11 errata-xmlrpc 2019-08-06 13:10:55 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2254
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