Public bug reported:
---Problem Description---
Pstore write is broken for PowerPC. On panic, kernel doesn't write mesg to
/fs/pstore/dmesg*
(Entry doesn't gets created at all)
Contact Information = Ankit Kumar/kumar.ankit...@in.ibm.com
---uname output---
Linux seedlp2 4.10.0-15-generic #17-Ubuntu SMP Fri Mar 24 17:50:37 UTC 2017
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = lpar
Write to nvram failed
---Debugger---
A debugger is not configured
---Steps to Reproduce---
1. Checked kdump kernel is loaded.
2. Triggered system crash
# echo c > /proc/sysrq-trigger
3. /sys/fs/pstore/dmesg* doesn't gets created
This issue can be reproduced after commit c950fd6f201
c950fd6f201 - pstore: Split pstore fragile flags
It introduces PSTORE_FLAGS_DMESG, which is not set for PowerPC.
Please include below commit 041939c1ec5 as this fixes this issue.
commit 041939c1ec54208b42f5cd819209173d52a29d34
Author: Ankit Kumar <an...@linux.vnet.ibm.com>
Date: Thu Apr 27 17:03:13 2017 +0530
pstore: Fix flags to enable dumps on powerpc
After commit c950fd6f201a kernel registers pstore write based on flag set.
Pstore write for powerpc is broken as flags(PSTORE_FLAGS_DMESG) is not set
for
powerpc architecture. On panic, kernel doesn't write message to
/fs/pstore/dmesg*(Entry doesn't gets created at all).
This patch enables pstore write for powerpc architecture by setting
PSTORE_FLAGS_DMESG flag.
Fixes: c950fd6f201a ("pstore: Split pstore fragile flags")
Cc: sta...@vger.kernel.org # v4.9+
Signed-off-by: Ankit Kumar <an...@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keesc...@chromium.org>
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-153411 severity-high
targetmilestone-inin1704
** Tags added: architecture-ppc64le bugnameltc-153411 severity-high
targetmilestone-inin1704
** Changed in: ubuntu
Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage
(ubuntu-power-triage)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1691045
Title:
PowerPC: Pstore dump for powerpc is broken
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