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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