[Crash-utility] x86 remap allocator in kernel 3.0

[Petr Tesarik]

Dne Čt 12. ledna 2012 09:16:06 Atsushi Kumagai napsal(a):
> Hello Petr,
> 
> On Tue, 10 Jan 2012 19:14:32 +0100
> 
> Petr Tesarik <ptesarik at suse.cz> wrote:
> > Ken'ichi Ohmichi, please note that makedumpfile is also affected by this
> > deficiency. On my test system, it will fail to produce any output if I
> > set dump level to anything greater than zero:
> > 
> > makedumpfile -c -d 31 -x vmlinux-3.0.13-0.5-pae.debug vmcore kdump.31
> > readmem: Can't convert a physical address(34a012b4) to offset.
> > readmem: type_addr: 0, addr:f4a012b4, size:4
> > get_mm_discontigmem: Can't get node_start_pfn.
> > 
> > makedumpfile Failed.
> > 
> > However, fixing this for makedumpfile is harder, and it will most likely
> > require a few more lines in VMCOREINFO, because debug symbols may not be
> > available at dump time, and I can't see any alternative method to locate
> > the remapped regions.
> 
> Thank you for your indication.
> 
> Could you send me your kernel configuration so that I can reproduce the
> issue ?

Attached. The most important settings are:

CONFIG_X86_32=y
CONFIG_DISCONTIGMEM_MANUAL=y

This also depends on CONFIG_NUMA=y

FYI my test system runs 3.0.15 (because that's used for SLES11 SP2), but the 
same issue also exists in any later version.

Petr Tesarik
SUSE Linux
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