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ipl fails with a "program interrupt loop" message

This document (3113358) is provided subject to the disclaimer at the end of this document.


Novell SUSE Linux Enterprise Server 9 Service Pack 4 on S/390 and S/390x


After an installation of SLES9 SP4 using a on zFCP device, the subsequent ipl fails with a "program interrupt loop" message. The error occurs on system with only little memory.

This error does not occur in case of an update of SLES9 SP3 to SP4.

The root cause is a misplaced RAM Disk, so that after boot, RAMDISK and kernel memory bitmap overlap.

The default initrd value in the ramdisk line in /etc/zipl.conf has changed between SP3 and SP4:

In SP3: ramdisk = /boot/initrd,0x1000000
In SP4: ramdisk = /boot/initrd,0x2000000

The value 0x2000000 will not work on systems with little memory, while the value 0x1000000 will not work on systems with large memory.

So returning the default value to 0x1000000 as in SP3 would cause large-memory system to fail, keeping the current one breaks other systems.


As a solution manually change the ramdisk entry in zipl.conf from

ramdisk = /boot/initrd,0x2000000
ramdisk = /boot/initrd,0x1000000

followed by the command "zipl".


This Support Knowledgebase provides a valuable tool for NetIQ/Novell/SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3113358
  • Creation Date:13-MAR-08
  • Modified Date:27-APR-12
    • SUSESUSE Linux Enterprise Server

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