Escalated to Bugzilla from IssueTracker
1. Summary: Since RHEL3-U6-re0729 iso, diskdump allways fails to save a crash dump. 2. Version-Release of Selected Component: kernel-2.4.21-33.EL 3. Target Releases: Red Hat Enterprise Linux 3 Update 2 4. Drivers or hardware dependency: Every SCSI adapters which have diskdump supported except CCISS adapter. Not dependent on architecture 5. Target Kernel: kernel-2.4.21-33.EL 6. Target Component: kernel 7. Description of Problem: The saving dump procudure terminates with the following message. scsi_dump: checksum error. scsi dump module may be compromised. 8. How reproducible: Every Time 9. Step to Reproduce: 1) Set up diskdump The diskdump partition must be on any SCSI adapter which supports diskdump. 2) Trigger panic by Alt-Sysrq-C or echo c > /proc/sysrq-trigger 10. Actual results: The saving dump procudure terminates with the following message. scsi_dump: checksum error. scsi dump module may be compromised. 11. Expected results: Crash dump succeeds without any error. 12. Additional info: This bug was caused by CCISS diskdump support feature which was created by HP and posted by Tom Coughlan. Actually CCISS diskdump code has no problem. The problem exists in diskdump common codes and it appear only if multiple submobules are loaded. Before RHEL3U6 re0729, The existing submodules was scsi_dump only. With re0729, ccsiss diskdump submodules was introduced and it triggered this bug. This is very severe bug for the existing diskdump user because diskdump always fails completely. 13. Severity: High 14. Other: None. Regards, Nobuhiro Tachino
Created attachment 117553 [details] linux-2.4.21-diskdump-scsi-crcfix.patch This patch fixes the problem. The patch was tested on our ia64 and i386 machines and x86_64 machine in Westford lab.
Would any Redhat people please put this BZ to the proposed list? This is a regression bug. Without fixing this, diskdump is almost dead on RHEL3U6 GA.
Changing severity to "regression", adding appropriate management to cc: list, and putting this on RHEL3 U6 Proposed list.
The patch was posted to rhkernel-list on Aug 16.
A fix for this problem has just been committed to the RHEL3 U6 patch pool this evening (in kernel version 2.4.21-35.EL).
I confirmed the bug is fixed on 2.4.21-35.EL and diskdump works on hammer1.lab.boston.
I confirmed the bug is fixed on re0902 iso.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-663.html