----- 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
>