crash on F20 beta says log_buf data structure has changed

[Dave Anderson]

----- Original Message -----
> 
> 
> ----- Original Message -----
> > 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?

Also, what version of crash are you using?  The fix for the structure name change
from "log" to "printk_log" went into crash-7.0.2.  I'm not sure whether that made
it into f20 from rawhide, or if f20 is still sitting at crash-7.0.1.

Dave


 
> I did, but as part of it, there's also this check for further changes:
> 
>                 /*
>                  * If things change, don't kill a dumpfile session
>                  * searching for a panic message.
>                  */
>                 if (INVALID_SIZE(log) ||
>                     INVALID_MEMBER(log_ts_nsec) ||
>                     INVALID_MEMBER(log_len) ||
>                     INVALID_MEMBER(log_text_len) ||
>                     INVALID_MEMBER(log_dict_len) ||
>                     (INVALID_MEMBER(log_level) &&
>                     INVALID_MEMBER(log_flags_level)) ||
>                     !kernel_symbol_exists("log_buf_len") ||
>                     !kernel_symbol_exists("log_buf")) {
>                         error(WARNING, "\nlog buf data structure(s) have
>                         changed\n");
>                         return;
>                 }
>  
> Is the system still available, or do you have a vmcore from that kernel?
> 
> Dave
> 
> 
> 
> > 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.
> > 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"...
> > 
> >       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
> > 
>