[Crash-utility] Re: 32 bit linux-2.6.24-git8 user_regs_structchange breaks opening kdump crashfiles

On Tue, 2008-11-18 at 14:05 -0500, Dave Anderson wrote: > Hi Joe, > > Can you verify that the attached patch works with your kdump? > > Thanks, > Dave > Hi Dave, The 2.6.25 kernel I built using "make defconfig" DID NOT exhibit this bug. The 2.6.25 kernel I built using "make oldconfig" DOES have the bug. So this could happen in any distro with the right combination of kernel config options (I would think after 2.6.25). I'll see if I can work out what options trigger this. I suspect it's either the CPU optimization choice or some SMP or real-timey option. I'll let you know what I find out. In the meantime your patch was sufficient to get around this.

Below I show crash-4.0-7.4 failing and then your patched crash-4.0-7.4: [root@beebo 11-18-08.1647.31]# /usr/src/crash-4.0-7.4.orig/crash vmcore vmlinux crash 4.0-7.4 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005 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 6.1 Copyright 2004 Free Software Foundation, Inc. GDB 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. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"... please wait... (determining panic task) crash: invalid structure member offset: user_regs_struct_ebp FILE: netdump.c LINE: 687 FUNCTION: get_netdump_panic_task() [/usr/src/crash-4.0-7.4.orig/crash] error trace: 80e0a0d => 8154325 => 814fe0b => 813ec91 813ec91: OFFSET_verify+126 814fe0b: get_netdump_panic_task+1196 8154325: get_kdump_panic_task+11 80e0a0d: get_dumpfile_panic_task+153 [root@beebo 11-18-08.1647.31]# ----------------------------------------------------------------------------------------- [root@beebo 11-18-08.1647.31]# /usr/src/crash-4.0-7.4.patched/crash vmcore vmlinux crash 4.0-7.4 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005 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 6.1 Copyright 2004 Free Software Foundation, Inc. GDB 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. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"... KERNEL: vmlinux DUMPFILE: vmcore CPUS: 8 DATE: Tue Nov 18 16:46:59 2008 UPTIME: 00:01:30 LOAD AVERAGE: 0.85, 0.33, 0.12 TASKS: 148 NODENAME: beebo RELEASE: 2.6.25-oldconfig VERSION: #1 SMP PREEMPT Tue Nov 18 16:31:40 EST 2008 MACHINE: i686 (3657 Mhz) MEMORY: 4 GB PANIC: "SysRq : Trigger a crashdump" PID: 5504 COMMAND: "crashme" TASK: f6f1b400 [THREAD_INFO: f7072000] CPU: 5 STATE: TASK_RUNNING (SYSRQ) crash>