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Bug 602785

Summary: mkdumprd should restore ld.so.cache rather than re-generate it
Product: Red Hat Enterprise Linux 6 Reporter: Dave Maley <dmaley>
Component: kexec-toolsAssignee: Cong Wang <amwang>
Status: CLOSED CURRENTRELEASE QA Contact: Han Pingtian <phan>
Severity: low Docs Contact:
Priority: low    
Version: 6.0CC: notting, phan, qcai, rkhan
Target Milestone: betaKeywords: Regression
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kexec-tools-2_0_0-79_el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 589768 Environment:
Last Closed: 2010-11-11 14:46:10 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: 589768    
Bug Blocks: 600568    
Attachments:
Description Flags
save/restore ld.so.cache in mkdumprd none

Description Dave Maley 2010-06-10 18:40:20 UTC 
Created attachment 423010 [details]
save/restore ld.so.cache in mkdumprd

+++ This bug was initially created as a clone of Bug #589768 +++

Created an attachment (id=412159)
save/restore ld.so.cache in mkdumprd

Description of problem:
When mkdumprd is run there's an ldconfig -l call to run ldd with a different cache, and then another ldconfig call follows to re-generate the cache.  This can present problems when mkdumprd is run during boot.  The kdump service (S20) is started before autofs (S28), so when ldconfig is run it will remove any symlinks to shared libs which reside on autofs managed filesystems.

To resolve this we should instead save/restore the original ld.so.cache.  This way we ensure we end up getting back to the original cache even if network filesystems aren't yet available to us.


Version-Release number of selected component (if applicable):
kexec-tools-1.102pre-96.el5


How reproducible:
100%


Steps to Reproduce:
1. install shared libs on fs managed by autofs
2. touch /etc/kdump.conf
3. reboot


Actual results:
symlinks to shared libs on autofs managed fs's are gone


Expected results:
symlinks are preserved


Additional info:
Comment 1 RHEL Program Management 2010-06-10 18:43:22 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.
Comment 2 Dave Maley 2010-06-10 18:45:35 UTC 
reason for 6.0 exception request is that bug 589768 is slated to be fixed in 5.6 and thus once 5.6 is released this will become a regression, thus trying to prevent that.
Comment 3 Bill Nottingham 2010-06-10 21:47:16 UTC 
Bugfixes at this point do not require exception.
Comment 7 Han Pingtian 2010-06-22 09:06:24 UTC 
Verified with kexec-tools-2.0.0-84.el6.x86_64:

[root@ibm-x3655-03 ~]# md5sum /etc/ld.so.cache
aa48c53d7a1d2f8cc9159ed4a008b70a  /etc/ld.so.cache
[root@ibm-x3655-03 ~]# ls -l /etc/ld.so.cache
-rw-r--r--. 1 root root 50515 Jun 12 22:25 /etc/ld.so.cache <---------------
[root@ibm-x3655-03 ~]# date
Tue Jun 22 04:57:33 EDT 2010
[root@ibm-x3655-03 ~]# touch /etc/kdump.conf
[root@ibm-x3655-03 ~]# service kdump restart
Stopping kdump:                                            [  OK  ]
Detected change(s) the following file(s):

  /etc/kdump.conf
Rebuilding /boot/initrd-2.6.32-37.el6.x86_64kdump.img
Starting kdump:                                            [  OK  ]
[root@ibm-x3655-03 ~]# md5sum /etc/ld.so.cache
aa48c53d7a1d2f8cc9159ed4a008b70a  /etc/ld.so.cache
[root@ibm-x3655-03 ~]# ls -l /etc/ld.so.cache
-rw-r--r--. 1 root root 50515 Jun 12 22:25 /etc/ld.so.cache <----------------
[root@ibm-x3655-03 ~]#
Comment 8 Cong Wang 2010-08-19 05:37:13 UTC 
Dave, in case we have a read-only root filesystem, I switched to 'ldconfig -N'. Just fyi.
Comment 9 releng-rhel@redhat.com 2010-11-11 14:46:10 UTC 
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.