------- Comment From [email protected] 2017-05-16 07:07 EDT------- Commit c950fd6f20 ("pstore: Split pstore fragile flags") is available in kernel 4.9 and above, while commit 041939c1ec ("pstore: Fix flags to enable dumps on powerpc") would get into 4.12, so need to be pulled into kernel version 4.9 and above.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1691045 Title: PowerPC: Pstore dump for powerpc is broken Status in The Ubuntu-power-systems project: New Status in linux package in Ubuntu: New Bug description: ---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/[email protected] ---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 <[email protected]> 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: [email protected] # v4.9+ Signed-off-by: Ankit Kumar <[email protected]> Signed-off-by: Kees Cook <[email protected]> To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1691045/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
