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Old 03-14-2011, 08:08 PM
Shawn Rhode
 
Default Infinite loop during gathering of kmem slab cache data

I am seeing an issue when opening a crash file from RHEL AS 2.1 with the last 2.1 kernel released where crash will sit at “please wait... (gathering kmem slab cache data)” forever taking 100% of the CPU.* Turning on debugging at level 5
continuously prints out the following sequence over and over without stopping:

<readmem: f79d52cc, KVADDR, "kmem_cache buffer", 244, (ROE), 8585500>

<readmem: f79d5340, KVADDR, "cpudata array", 128, (ROE), ffffcbd0>

<readmem: f79d5344, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5344, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d534c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d534c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5354, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5354, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d535c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d535c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5364, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5364, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d536c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d536c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5374, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5374, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d537c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d537c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5384, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5384, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d538c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d538c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5394, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d5394, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d539c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d539c, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53a4, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53a4, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53ac, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53ac, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53b4, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53b4, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53bc, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d53bc, KVADDR, "cpucache limit", 4, (ROE), ffffcbcc>

<readmem: f79d52cc, KVADDR, "kmem_cache buffer", 244, (ROE), 8585500>

....

*

I am on the latest version of crash, 5.1.3:

[srhode@crash 1642489]$ crash32 -v

*

crash32 5.1.3

Copyright (C) 2002-2011* Red Hat, Inc.

Copyright (C) 2004, 2005, 2006* IBM Corporation

Copyright (C) 1999-2006* Hewlett-Packard Co

Copyright (C) 2005, 2006* Fujitsu Limited

Copyright (C) 2006, 2007* VA Linux Systems Japan K.K.

Copyright (C) 2005* 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) 7.0

Copyright (C) 2009 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 "--host=x86_64-unknown-linux-gnu --target=i686-pc-linux-gnu".

*

If I open the dump file using the “—no_kmem_cache” option, it opens, but I am not sure if this is causing other issues during analysis of the dump file.*


*

Shawn Rhode

Principal Support Engineer – Egenera Global Technical Support




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