Public bug reported: If you capture a kernel crashdump on i386 after 4.4 (4.8 & 4.10 tested), they cannot be used by debugged with crash (see log below). crash reports that the dump & the debug kernel do not match, even though they are from the same build. This works fine on amd64.
root@kdump-i386:/var/crash/201706221838# crash /usr/lib/debug/boot/vmlinux-4.10.0-24-generic dump.201706221838 crash 7.1.8 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 "i686-pc-linux-gnu"... crash: page excluded: kernel virtual address: c1c344b4 type: "possible" WARNING: cannot read cpu_possible_map crash: page excluded: kernel virtual address: c1c344ac type: "present" WARNING: cannot read cpu_present_map crash: page excluded: kernel virtual address: c1c344b0 type: "online" WARNING: cannot read cpu_online_map crash: page excluded: kernel virtual address: c1c344a8 type: "active" WARNING: cannot read cpu_active_map crash: page excluded: kernel virtual address: c1b7dd64 type: "pv_init_ops" crash: page excluded: kernel virtual address: c1d7a820 type: "shadow_timekeeper xtime_sec" crash: page excluded: kernel virtual address: c1b6a0a4 type: "init_uts_ns" crash: /usr/lib/debug/boot/vmlinux-4.10.0-24-generic and dump.201706221838 do not match! Usage: crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS] (dumpfile form) crash [OPTION]... [NAMELIST] (live system form) Enter "crash -h" for details. ** Affects: crash (Ubuntu) Importance: Undecided Status: New ** Affects: kexec-tools (Ubuntu) Importance: Undecided Status: New ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to kexec-tools in Ubuntu. https://bugs.launchpad.net/bugs/1699874 Title: i386 dumps unusable w/ kernels > 4.4 Status in crash package in Ubuntu: New Status in kexec-tools package in Ubuntu: New Status in linux package in Ubuntu: New Bug description: If you capture a kernel crashdump on i386 after 4.4 (4.8 & 4.10 tested), they cannot be used by debugged with crash (see log below). crash reports that the dump & the debug kernel do not match, even though they are from the same build. This works fine on amd64. root@kdump-i386:/var/crash/201706221838# crash /usr/lib/debug/boot/vmlinux-4.10.0-24-generic dump.201706221838 crash 7.1.8 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 "i686-pc-linux-gnu"... crash: page excluded: kernel virtual address: c1c344b4 type: "possible" WARNING: cannot read cpu_possible_map crash: page excluded: kernel virtual address: c1c344ac type: "present" WARNING: cannot read cpu_present_map crash: page excluded: kernel virtual address: c1c344b0 type: "online" WARNING: cannot read cpu_online_map crash: page excluded: kernel virtual address: c1c344a8 type: "active" WARNING: cannot read cpu_active_map crash: page excluded: kernel virtual address: c1b7dd64 type: "pv_init_ops" crash: page excluded: kernel virtual address: c1d7a820 type: "shadow_timekeeper xtime_sec" crash: page excluded: kernel virtual address: c1b6a0a4 type: "init_uts_ns" crash: /usr/lib/debug/boot/vmlinux-4.10.0-24-generic and dump.201706221838 do not match! Usage: crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS] (dumpfile form) crash [OPTION]... [NAMELIST] (live system form) Enter "crash -h" for details. 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