[Crash-utility] crash: invalid kernel virtual address: 0 type: "memory section"

[Castillon de la Cruz, Eddy Gonzalo]

Hello, 

Sure, we can provide acces to the dump. 


Saludos / Regards, 

Eddy Castillon 
System Infrastructure Engineer 
Axcess Financial | Peru 
ecastillon at axcess-financial.com 
Office: +51 - 6408117 - 2175 
Cellphone: 983270761 
http://www.axcess-financial.com.pe 

----- Original Message -----

From: "Ilya Dryomov" <idryomov at redhat.com> 
To: crash-utility at redhat.com 
Cc: "Castillon de la Cruz, Eddy Gonzalo" <ecastillon at axcess-financial.com> 
Sent: Monday, January 5, 2015 9:16:09 AM 
Subject: crash: invalid kernel virtual address: 0 type: "memory section" 

Hello, 

I have a couple dumps generated on Ubuntu Trusty LTS (3.13.0-39-generic 
kernel) which crash fails on. 

$ ./crash ../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic 
../dump.201412280256 

crash 7.0.9 
Copyright (C) 2002-2014 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 "x86_64-unknown-linux-gnu"... 

crash: cannot determine thread return address 
please wait... (gathering kmem slab cache data) 
crash: invalid kernel virtual address: 1c type: "kmem_cache 
objsize/object_size" 
crash: failed to read pageflag_names entry 
please wait... (gathering module symbol data) 
WARNING: invalid kernel module size: 0 

crash: cannot determine idle task addresses from init_tasks[] or runqueues[] 

crash: cannot resolve "init_task_union" 


vmlinux-3.13.0-39-generic was extracted from Ubuntu ddeb: 

$ file ../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic 
../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic: ELF 64-bit LSB 
executable, x86-64, version 1 (SYSV), statically linked, 
BuildID[sha1]=c4fa631d2cc34a0b2628a5de01a04e81a0667555, not stripped 

With -d8 I get: 

... 
<read_diskdump: addr: ffffffffffffffff paddr: 7fffffff cnt: 1> 
read_diskdump: paddr/pfn: 7fffffff/7ffff -> cache physical page: 7ffff000 
crash: invalid kernel virtual address: 0 type: "memory section" 

The entire -d8 output is attached. 

Bogus "base kernel version" stands out immediately and I'm pretty sure 
I've seen "0.0.0" in there a couple times with exactly the same dump. 
>From a quick look, the base kernel version code in kernel.c is not safe 
against kt->utsname.release being all zeroes. 

Eddy Gonzalo (CC'ed) can probably provide access to the dumps if 
needed. 

Thanks, 

Ilya 


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