Red Hat Bugzilla – Bug 6382
RH61 cpio and /proc/kcore - machine reboots!?
Last modified: 2008-05-01 11:37:52 EDT
Hardware: IBM Netfinity 5000, 256MB, ServeRAID
Software: RedHat 6.1, very standard installation
How to crash:
"find / -type f -print | cpio -oc >/dev/null"
or more isolated version:
echo /proc/kcore | cpio -oc >/dev/null
/var/log/messages gets 3 lines:
Oct 26 13:23:21 myyx0002 kernel: Uhhuh. NMI received for
unknown reason 25.
Oct 26 13:23:21 myyx0002 kernel: Dazed and confused, but
trying to continue
Oct 26 13:23:21 myyx0002 kernel: Do you have a strange power
saving mode enabled?
then cpio completes, no errors, back to prompt
then 45 ... 60 seconds and machine reboots itself !!!!!!!!!
IBM Netfinity has system error led, which gets lit at the
same time when "Uhhuh ..." message comes to
This isn't a cpio problem, but rather a problem in using cpio. There
are files in /proc (and in /dev) that will cause surprises if restored
by cpio. Basically, don't do that ...