Red Hat Bugzilla – Bug 99011
Full backup of root directory using 'tar' causes system reboot
Last modified: 2007-11-30 17:06:53 EST
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Description of problem:
ia64/IPF (rx2600) system reboots during execution of "tar cvf fullbackup.tar /" command. The culprit is /proc filesystem. If the tar
command excludes the /proc filesystem, the tar command is successful without a system reboot.
It turns out the the problem is the ia-64 memory space with its embedded I/O memory and holes. If you read one of these invalid
memory locations you will MCA. For example, just wc /proc/kcore you will generate an MCA and reboot.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Execute "tar cvf fullbackup.tar /"
2. System would reboot during the backup of /proc filesystem.
Actual Results: Automatic System Reboot
Expected Results: System should NOT automatically reboot during backup of /proc filesystem.
[root@netuxipf root]# cat /etc/redhat-release
Red Hat Linux Advanced Server release 2.1AS (Derry)
[root@netuxipf root]# uname -a
Linux netuxipf 2.4.18-e.31smp #1 SMP Wed May 21 17:47:59 EDT
2003 ia64 unknown
Reading of memory holes and other I/O space is expected to MCA.