[Crash-utility] crash: invalid kernel virtual address: 0 type: "memory section"
Dave Anderson
anderson at redhat.com
Mon Jan 5 16:28:29 UTC 2015
Our last two messages crossed -- you have found the problem...
Dave
----- Original Message -----
> On Mon, Jan 5, 2015 at 7:02 PM, Ilya Dryomov <idryomov at redhat.com> wrote:
> > On Mon, Jan 5, 2015 at 6:49 PM, Dave Anderson <anderson at redhat.com> wrote:
> >>
> >>
> >> Just for sanity's sake, try this:
> >>
> >> $ ./crash --minimal ../ddeb/usr/lib/debug/boot/vmlinux-3.13.0-39-generic
> >> ../dump.201412280256
> >>
> >> and see if you can read the linux_banner string successfully. For
> >> example, using
> >> my sample 3.13 kernel:
> >>
> >> $ crash --minimal 3.13.0-0.rc1.git2.1.fc20_SLAB/vmlinux.gz
> >> 3.13.0-0.rc1.git2.1.fc20_SLAB/vmcore_c_d31
> >>
> >> 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"...
> >>
> >> NOTE: minimal mode commands: log, dis, rd, sym, eval, set, extend and
> >> exit
> >>
> >> crash> rd -a linux_banner
> >> ffffffff818000c0: Linux version 3.13.0-0.rc1.git2.1.fc20.x86_64
> >> (root at hp-xw455
> >> ffffffff818000fc: 0-02.ml3.eng.bos.redhat.com) (gcc version 4.8.1
> >> 20130814 (Re
> >> ffffffff81800138: d Hat 4.8.1-6) (GCC) ) #1 SMP Tue Nov 26 14:42:45 EST
> >> 2013
> >> crash>
> >>
> >> And then try reading other stuff, most notably the __per_cpu_offset[]
> >> array,
> >> like this:
> >>
> >> crash> rd __per_cpu_offset 256
> >
> > Attached - __per_cpu_offset seems busted.
>
> OK, so the banner read with crash is
>
> ffffffff818000a0: Linux version 3.13.0-39-generic (buildd at brownie) (gcc
> versio
> ffffffff818000dc: n 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) )
> #66~precise1-Ubuntu
> ffffffff81800118: SMP Wed Oct 29 09:56:49 UTC 2014 (Ubuntu
> 3.13.0-39.66~preci
> ffffffff81800154: se1-generic 3.13.11.8)
>
> whereas the banner from vmlinux-3.13.0-39-generic is
>
> 0a000a0: 4c69 6e75 7820 7665 7273 696f 6e20 332e Linux version 3.
> 0a000b0: 3133 2e30 2d33 392d 6765 6e65 7269 6320 13.0-39-generic
> 0a000c0: 2862 7569 6c64 6440 746f 796f 6c29 2028 (buildd at toyol) (
> 0a000d0: 6763 6320 7665 7273 696f 6e20 342e 382e gcc version 4.8.
> 0a000e0: 3220 2855 6275 6e74 7520 342e 382e 322d 2 (Ubuntu 4.8.2-
> 0a000f0: 3139 7562 756e 7475 3129 2029 2023 3636 19ubuntu1) ) #66
> 0a00100: 2d55 6275 6e74 7520 534d 5020 5475 6520 -Ubuntu SMP Tue
> 0a00110: 4f63 7420 3238 2031 333a 3330 3a32 3720 Oct 28 13:30:27
> 0a00120: 5554 4320 3230 3134 2028 5562 756e 7475 UTC 2014 (Ubuntu
> 0a00130: 2033 2e31 332e 302d 3339 2e36 362d 6765 3.13.0-39.66-ge
> 0a00140: 6e65 7269 6320 332e 3133 2e31 312e 3829 neric 3.13.11.8)
>
> I guess I need to try to hunt down that exact vmlinux. Sigh.
>
> Thanks,
>
> Ilya
>
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
>
More information about the Crash-utility
mailing list