8:21 a.m.
----- Original Message -----
I have a dump from RHEL 6.2 with all these masks set to all f's,
so
obviously crash excludes them.
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"possible"
WARNING: cannot read cpu_possible_map
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"present"
WARNING: cannot read cpu_present_map
crash: page excluded: kernel virtual address: ffffffffffffffff type: "online"
WARNING: cannot read cpu_online_map
typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
/* These strip const, as traditionally they weren't const. */
#define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
#define cpu_online_map (*(cpumask_t *)cpu_online_mask)
#define cpu_present_map (*(cpumask_t *)cpu_present_mask)
#define cpu_active_map (*(cpumask_t *)cpu_active_mask)
Are these deprecated now and is that why they are fixed at all f's.
No, that's just a common error message for accessing the maps or masks.
When reading them, crash checks first whether there is the older kernel symbol
named "cpu_xxx_map", and if it doesn't exists, then it checks for the
symbol
named "cpu_xxx_mask". It then tried to read the memory that those symbols
point to, which all contained values of ffffffffffffffff. So clearly
there's some kind of mis-match between the symbol values -- modified by
using a System.map file -- and what's in the vmcore file.
(FWIW, the dumpfile couldn't find the page for bogus address, and presumed
that it was "excluded" since it's a filtered dump, so that's a
non-issue...)
First question: it appears that you are analyzing a RHEL6 kernel, so why are
you using a "System.map" argument? Did you rebuild the kernel but when you
did that, you didn't save the rebuilt vmlinux file?
Dave
[root@centos62 crash]# crash System.map vmlinux va102.2012-06-14.vmcore
crash 6.0.7
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Copyright (C) 2005, 2011 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
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This is free software: you are free to change and redistribute it.
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This GDB was configured as "x86_64-unknown-linux-gnu"...
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"possible"
WARNING: cannot read cpu_possible_map
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"present"
WARNING: cannot read cpu_present_map
crash: page excluded: kernel virtual address: ffffffffffffffff type: "online"
WARNING: cannot read cpu_online_map
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"cpu_present_map"
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"cpu_present_map"
crash: page excluded: kernel virtual address: ffffffffffffffff type:
"cpu_online_map"
SYSTEM MAP: System.map
DEBUG KERNEL: vmlinux (2.6.32-220.7.1.el6)
DUMPFILE: va102.2012-06-14.vmcore [PARTIAL DUMP]
CPUS: 32
DATE: Thu Jun 14 05:24:17 2012
UPTIME: 11:13:23
LOAD AVERAGE: 215.00, 196.78, 135.81
TASKS: 1778
NODENAME: va1splunkindex02.va1.swtor.int
RELEASE: 2.6.32-220.7.1.el6.x86_64
VERSION: #1 SMP Tue Mar 6 13:54:51 EST 2012
MACHINE: x86_64 (2799 Mhz)
MEMORY: 48 GB
PANIC: "Oops: 0002 [#1] SMP " (check log for details)
PID: 2428
COMMAND: "bash"
TASK: ffff88063874ab40 [THREAD_INFO: ffff8806dcd1a000]
CPU: 0
STATE: TASK_RUNNING (PANIC)
Thanks
Laurence
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