[Crash-utility] snap crash plugin on RHEL 4

[Adrien Kunysz]

Dave Anderson wrote:
> ----- "Adrien Kunysz" <adk at redhat.com> wrote:
> 
>> Dave Anderson wrote:
>>> I'm guessing that the memory containing virtual address 0x1020009d024
>>> (physical 0x20009d024) is not there for some reason.
>> # crash
>> [...]
>> crash> !tty
>> /dev/pts/0
>> crash> set console /dev/pts/0
>> debug console [11227]: /dev/pts/0
>> console: /dev/pts/0
>> crash> extend snap-rhel4-x86_64/snap.so
>> ./snap-rhel4-x86_64/snap.so: shared object loaded
>> crash> snap mycore
>> 00000000-00099bff : System RAM
>> 00100000-f7feffff : System RAM
>> ram_segments[0]: 0000000000000000 0000000000099000 [00000000-00099bff]
>> ram_segments[1]: 0000000000100000 00000000f7ff0000 [00100000-f7feffff]
>> mycore: [100%]
>> -rw-r--r--  1 root root 4160684848 Sep  3 10:23 mycore
>> crash> quit
>> crash 5057 0 - Live 0xffffffffa0220000
>> # crash /usr/lib/debug/lib/modules/2.6.9-89.ELsmp/vmlinux mycore
>> [...]
>> crash: read error: kernel virtual address: 1020009d024  type:
>> "tss_struct ist array"
>>
>> Not sure how to read this.
> 
> When the vmcore is created by "snap", it first looks at /proc/iomem for
> the regions of physical memory that are dumpable.  Therefore it rejected
> any physical address above f7feffff, which is the problem at hand.  

f7ff0000-f7ffefff : ACPI Tables
f7fff000-f7ffffff : ACPI Non-volatile Storage

> Just for sanity's sake, what does "cat /proc/iomem" show?

00000000-00099bff : System RAM
00099c00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c9fff : Video ROM
000ca000-000cafff : Adapter ROM
000cb000-000cbfff : Adapter ROM
000cc000-000ccfff : Adapter ROM
000cd000-000cdfff : Adapter ROM
000ce000-000cefff : Adapter ROM
000cf000-000d4bff : Adapter ROM
000f0000-000fffff : System ROM
00100000-f7feffff : System RAM
   00100000-00318afa : Kernel code
   00318afb-00469ec0 : Kernel data
f7ff0000-f7ffefff : ACPI Tables
f7fff000-f7ffffff : ACPI Non-volatile Storage
fbf00000-fbffffff : PCI Bus #01
   fbf80000-fbf9ffff : 0000:01:02.1
     fbf80000-fbf9ffff : e1000
   fbfa0000-fbfbffff : 0000:01:02.0
     fbfa0000-fbfbffff : e1000
   fbfc0000-fbfdffff : 0000:01:01.1
     fbfc0000-fbfdffff : e1000
   fbfe0000-fbffffff : 0000:01:01.0
     fbfe0000-fbffffff : e1000
fc000000-fc4fffff : PCI Bus #02
   fc4e0000-fc4effff : 0000:02:03.0
   fc4fc000-fc4fffff : 0000:02:03.0
fc500000-fe5fffff : PCI Bus #03
   fd000000-fdffffff : 0000:03:03.0
   fe5fd000-fe5fdfff : 0000:03:00.1
     fe5fd000-fe5fdfff : ohci_hcd
   fe5fe000-fe5fefff : 0000:03:00.0
     fe5fe000-fe5fefff : ohci_hcd
   fe5ff000-fe5fffff : 0000:03:03.0
fe6fe000-fe6fefff : 0000:00:02.1
fe6ff000-fe6fffff : 0000:00:01.1
fe700000-fe7fffff : PCI Bus #01
fe800000-fe8fffff : PCI Bus #02
feafe000-feafefff : 0000:04:02.1
feaff000-feafffff : 0000:04:01.1
ff700000-ffffffff : reserved