crash on F20 beta says log_buf data structure has changed

[Dave Anderson]

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

Sorry, I didn't check the output below -- it's still at 7.0.1-2.fc20.
Can you file a Fedora BZ, and when it opens for bug fixes, I'll push
it out.

Until then, you can get the Rawhide version here:

 Information for build crash-7.0.3-1.fc21
 http://koji.fedoraproject.org/koji/buildinfo?buildID=474614

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
> > > 
> > 
>