Public bug reported: == Comment: #0 - Ping Tian Han - 2016-09-22 03:05:36 == ---Problem Description--- crash cannot check vmcore of 4.8 kernel.
Then when trying to check the core with crash: % sudo crash /usr/lib/debug/boot/vmlinux-4.8.0-14-generic /var/crash/201609212349/vmcore.201609212349 crash 7.1.5 Copyright (C) 2002-2016 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb (GDB) 7.6 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64le-unknown-linux-gnu"... please wait... (gathering kmem slab cache data) crash: invalid kernel virtual address: 7aa9fe01000000 type: "pmd page" ---uname output--- Linux roselp2 4.8.0-14-generic #15-Ubuntu SMP Tue Sep 20 21:59:33 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux Machine Type = IBM,8286-42A, lpar ---Steps to Reproduce--- 1. install 4.8 kernel 2. trigger kdump to get vmcore 3. check the vmcore with crash == Comment: #8 - Hari Krishna Bathini - 2016-09-24 14:12:23 == The below commit is needed for vtop address translation to succeed commit 182914debbb9a2671ef644027fedd339aa9c80e0 Author: Dave Anderson <ander...@redhat.com> Date: Fri Sep 23 09:09:15 2016 -0400 With the introduction of radix MMU in Power ISA 3.0, there are changes in kernel page table management accommodating it. This patch series makes appropriate changes here to work for such kernels. Also, this series fixes a few bugs along the way: ppc64: fix vtop page translation for 4K pages ppc64: Use kernel terminology for each level in 4-level page table ppc64/book3s: address changes in kernel v4.5 ppc64/book3s: address change in page flags for PowerISA v3.0 ppc64: use physical addresses and unfold pud for 64K page size ppc64/book3s: support big endian Linux page tables The patches are needed for Linux v4.5 and later kernels on all ppc64 hardware. (hbath...@linux.vnet.ibm.com) -- Also, the below commit is needed commit 8ceb1ac628bf6a0a7f0bbfff030ec93081bca4cd Author: Dave Anderson <ander...@redhat.com> Date: Mon May 23 11:23:01 2016 -0400 Fix for Linux commit 0139aa7b7fa12ceef095d99dc36606a5b10ab83a, which renamed the page._count member to page._refcount. Without the patch, certain "kmem" commands fail with the "kmem: invalid structure member offset: page_count". (ander...@redhat.com) Thanks Hari ** Affects: crash (Ubuntu) Importance: Undecided Assignee: Taco Screen team (taco-screen-team) Status: New ** Tags: architecture-ppc64le bugnameltc-146625 severity-critical targetmilestone-inin--- ** Tags added: architecture-ppc64le bugnameltc-146625 severity-critical targetmilestone-inin--- ** Changed in: ubuntu Assignee: (unassigned) => Taco Screen team (taco-screen-team) ** Package changed: ubuntu => crash (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1628173 Title: ISST-LTE:pVM:roselp2:ubuntu 16.10: crash failed to check vmcore of 4.8 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1628173/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
