Hi All,

 

I downloaded and built crash 4.0.9 for Intel X86 linux machine.

I'm trying to debug kdump-generated vmcore, taken using the "crash kernel".

Kernel: 2.6.27.34

Main kernel argument: crashkernel=64M@16M

Main kernel loaded at 2M.

 

The problem:

./crash <vmlinux> <vmcore>

behaves kinda strange... it gets stuck in the following loop of function calls, during reading totalram_pages symbol: 

    get_symbol_data("totalram_pages") -> readmem("totalram_pages") ->kvtop -> x86_kvtop ("pgd page") ->readmem ("pgd page") ->kvtop -> x86_kvtop("pgd page") -> readmem("pgd page")

 

and eventually crashes, probably when recursion reaches stack limit.

 

Why would such a situation happen...?

 

With gdb, though, things are different - gdb is able to read the vmcore, and give the gdb prompt, at which I can see the init_mm structure, and backtrace etc. I also verified that pgd address (init_mm.pgd) is the same as crash is  trying to read through readmem("pgd page").

 

Any inputs will be very useful.

 

Thanks,

Sumeet