9:19 a.m.
----- Original Message -----
----- Original Message -----
>
>
> crash can not exit from readmem() recursive until it is killed because of
> OOM or Segmentation fault on PPC64 cpu.
>
> readmem-->kvtop-->ppc64_vtop_level4-->readme-->kvtop....
This is the first I've heard of it, but I normally don't use/test ppc64 kernels.
Typically, low-level ppc64 architecture support is done by IBM guys on the list.
I've cc'd this response directly to several of them to see if they've been
running
on more recent ppc64 kernel versions.
Dave
FYI, I just provisioned a Fedora 17 ppc64 machine running 3.6.7-4.fc17.ppc64,
and it works OK:
$ crash
crash 6.1.2
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) 7.3.1
Copyright (C) 2011 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 "powerpc64-unknown-linux-gnu"...
crash: read error: kernel virtual address: c00000000082efb0 type:
"cpu_possible_mask"
crash: this kernel may be configured with CONFIG_STRICT_DEVMEM, which
renders /dev/mem unusable as a live memory source.
crash: trying /proc/kcore as an alternative to /dev/mem
KERNEL: /usr/lib/debug/lib/modules/3.6.7-4.fc17.ppc64/vmlinux
DUMPFILE: /proc/kcore
CPUS: 4
DATE: Thu Jan 24 10:12:41 2013
UPTIME: 01:05:49
LOAD AVERAGE: 0.08, 0.06, 0.26
TASKS: 121
NODENAME: ibm-squad7-lp1.rhts.eng.bos.redhat.com
RELEASE: 3.6.7-4.fc17.ppc64
VERSION: #1 SMP Thu Dec 6 06:41:58 MST 2012
MACHINE: ppc64 (1898 Mhz)
MEMORY: 3.8 GB
PID: 1803
COMMAND: "crash"
TASK: c0000000e1260000 [THREAD_INFO: c0000000e1880000]
CPU: 2
STATE: TASK_RUNNING (ACTIVE)
crash>
Dave
>
> root@localhost:~# uname -a
> Linux localhost 3.4.20 #2 SMP PREEMPT Thu Jan 24 14:43:59 CST 2013 ppc64 GNU/Linux
> root@localhost:~#
>
> root@localhost:~# crash
>
> crash 6.1.0
> Copyright (C) 2002-2012 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 GN! U 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) 7.3.1
> Copyright (C) 2011 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 "powerpc64-wrs-linux"...
>
> Segmentation fault (core dumped)
> root@localhost:~# gdb /usr/bin/crash core
> GNU gdb (Linux Sourcery CodeBench 4.6a-98) 7.4.50.20120716-cvs
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free softwar! e: 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 "powerpc64-wrs-linux-gnu".
> For bug reporting instructions, please see:
> <support@codesource.com>...
> Reading symbols from /usr/bin/crash...Reading symbols from
> /usr/bin/.debug/crash...done.
> done.
> [New LWP 1166]
>
> warning: Could not load shared library symbols for
> linux-vdso64.so.1.
> Do you need "set solib-search-path" or "set sysroot"?
> Core was generated by `crash '.
> Program terminated with signal 11, Segmentation fault.
> #0 readmem (addr=13835058055299842048, memtype=1,
> buffer=0x10cbc460,
> size=4096, type=0x106eafe8 "level4 page", error_handle=1) at
> memory.c:1959
> 1959 {
> (gdb) bt
> #0 readmem (addr=13835058055299842048, memtype=1,
> buffer=0x10cbc460,
> size=4096, type=0x106eafe8 "level4 page", error_handle=1) at
> memory.c:1959
> #1! 0x000000001011a2e4 in ppc64_vtop_level4
> (vaddr=13835058055299842048,
> level4=0xc0000000010dc000, paddr=0xfffe73ed1d8, verbose=<optimized
> out>)
> at ppc64.c:561
> #2 0x0000000010097264 in kvtop (tc=<optimized out>,
> kvaddr=<error reading variable: value has been optimized out>,
> paddr=<optimized out>,
> verbose=<error reading variable: value has been optimized out>)
> at memory.c:2765
> #3 0x000000001009895c in readmem (addr=13835058055299842048,
> memtype=<optimized out>, buffer=<optimized out>, size=<optimized
> out>,
> type=0x106eafe8 "level4 page", error_handle=1) at memory.c:2032
> #4 0x000000001011a2e4 in ppc64_vtop_level4
> (vaddr=13835058055299842048,
> level4=0xc0000000010dc000, paddr=0xfffe73ed418, verbose=&!
> lt;optimized out>)
> at ppc64.c:561
> #5 ! 0x0000000010097264 in kvtop (tc=<optimized out>,
> kvaddr=<error reading variable: value has been optimized out>,
> paddr=<optimized out>,
> verbose=<error reading variable: value has been optimized out>)
> at memory.c:2765
> #6 0x000000001009895c in readmem (addr=13835058055299842048,
> memtype=<optimized out>, buffer=<optimized out>, size=<optimized
> out>,
> ---Type <return> to continue, or q <return> to quit---quit
> type=Quit
> (gdb) quit
>
>
>
>
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