crash on F20 beta says log_buf data structure has changed

[Vivek Goyal]

Hi Dave,

I captured a crash of F20 beta system and opened vmcore. crash gives me
warning that log_buf has changed and "log" command does not output
anything.

I thought you fixed it. Is it just a problem of pushing crash update
to F20?

Thanks
Vivek

# crash /usr/lib/debug/lib/modules/3.11.8-300.fc20.x86_64/vmlinux vmcore

crash 7.0.1-2.fc20
Copyright (C) 2002-2013  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.
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and you are welcome to change it and/or distribute copies of it under
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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.
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This GDB was configured as "x86_64-unknown-linux-gnu"...

      KERNEL: /usr/lib/debug/lib/modules/3.11.8-300.fc20.x86_64/vmlinux
    DUMPFILE: vmcore  [PARTIAL DUMP]
        CPUS: 4
        DATE: Tue Nov 19 16:33:43 2013
      UPTIME: 00:03:24
LOAD AVERAGE: 0.18, 0.37, 0.18
       TASKS: 172
    NODENAME: <Edited>
     RELEASE: 3.11.8-300.fc20.x86_64
     VERSION: #1 SMP Wed Nov 13 16:34:27 UTC 2013
     MACHINE: x86_64  (2333 Mhz)
      MEMORY: 4 GB
       PANIC: 
WARNING: log buf data structure(s) have changed
""
         PID: 10584
     COMMAND: "bash"
        TASK: ffff8801371d96e0  [THREAD_INFO: ffff880138dd8000]
         CPU: 3
       STATE: TASK_RUNNING (PANIC)

crash> log

log: WARNING: log buf data structure(s) have changed