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kdump gets stuck during copying of /proc/vmcore

This document (7002347) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 10 Service Pack 2


The target is to get a memory dump either automatically after a system crash/exception, or by triggering it with echo c > /proc/sysrq-trigger.
After the kdump kernel has been loaded, the last messages seen on the screen, before the kdump kernel hangs,  looks like the following:

waiting for devices /dev/sde1 to appear:  ok
rootfs: major=8 minor=3 devn=2051
ok, dumping to /dev/sde1

After the above lines, there is no more activities.

Obviously,  the copy process cp /proc/vmcore /dev/sde1 did not succeed.

NB: Here it is assumed that /dev/sde1 is the KDUMP_DUMPDEVICE.



To solve this problem, edit /etc/sysconfig/kdump and do the following:

1) set the following values under /etc/sysconfig/dump

# /etc/sysconfig/kdump
KEXEC_OPTIONS=" --args-linux "
KDUMP_DUMPDEV="/dev/sde1"          #---------> /dev/sde1 is just an example, please change it.

KDUMP_DUMPLEVEL=31 (or KDUMP_DUMPLEVEL=0x31) does strip all information that is not needed for the analysis. KDUMP_DUMPFORMAT is used to reduce the size of the dump.

2) Install makedumpfile package if it is not already installed. This package is needed whenever a KDUMP_DUMPLEVEL different from 0 is set.


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  • Document ID:7002347
  • Creation Date: 12-Jan-2009
  • Modified Date:24-Mar-2021
    • SUSE Linux Enterprise Server

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