Bug 209777 - kdump misreads a root device on ia64 box
Summary: kdump misreads a root device on ia64 box
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kexec-tools
Version: 5.0
Hardware: ia64
OS: Linux
medium
medium
Target Milestone: ---
: ---
Assignee: Neil Horman
QA Contact:
URL:
Whiteboard:
Keywords:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-10-06 20:34 UTC by Akira Imamura
Modified: 2007-11-30 22:07 UTC (History)
3 users (show)

(edit)
Clone Of:
(edit)
Last Closed: 2007-02-13 17:13:28 UTC


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Description Akira Imamura 2006-10-06 20:34:56 UTC
Description of problem:
kdump misreads a root device on ia64 box. Consequently, checking root
filesystem always fails.
In mkdumprd, the way to search a root device is not good enough for ia64.

Version-Release number of selected component (if applicable):
kexec-tools-1.101-83.el5

How reproducible:
Always

Steps to Reproduce:
1. In /etc/kdump.conf, specify nowhere to copy /proc/vmcore file.
2. Start kdump service.
3. Make system panic.
  
Actual results:
kdump misreads a root device. Anyway /proc/vmcore cannot be copied.

Expected results:
kdump finds a root device correctly, and then it can check root filesystem.


Additional info:
Here's a patch to fix this problem. This patch will be good enough
for i386, ia64, and x86_64.

--- mkdumprd    5 Oct 2006 20:03:22 -0000       1.25
+++ mkdumprd    6 Oct 2006 19:48:15 -0000
@@ -1598,7 +1598,7 @@ emit "#check to see if we have root= on
 emit "ROOTDEV=\`cat /proc/cmdline | grep root=\`"
 emit "if [ -n \"\$ROOTDEV\" ]"
 emit "then"
-emit "   ROOTDEV=\`cat /proc/cmdline | cut -d\" \" -f2 | sed -e's/root=//'\`"
+emit "   ROOTDEV=\`cat /proc/cmdline | sed 's/^.*root=//' | cut -d\" \"  -f1\`"
 emit "   IS_LABEL=\`echo \$ROOTDEV | grep LABEL\`"
 emit "   IS_UUID=\`echo \$ROOTDEV | grep UUID\`"
 emit "   if [ -n \"\$IS_LABEL\" -o -n \"\$IS_UUID\" ] "

Comment 1 Neil Horman 2006-10-09 11:45:37 UTC
yeah, I can see how that might improve the parsing of the rootdev, in the event
that root\ isn't the second value key.  fixed in -85.el5.  Thanks!

Comment 2 Jay Turner 2007-02-13 17:11:30 UTC
Fix confirmed in kexec-tools-1.101-164.el5.


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