----- "Paul-Kenji Cahier Furuya" <pkc@xxxxxxxxxxxx> wrote:
> On 08/23/2010 22:20, Dave Anderson wrote:
> > Well, yes, you'd have to be able to log into the machine, and
> > then just run:
> >
> > # crash
> >
> > or if the /vmlinux file is not in a common location, do this:
> >
> > # crash /path/to/vmlinux
> >
> > And that presumes you've got crash installed on the system as well.
> >
> I might be able to get a physical access at some point, but right now I
> have none.
>
> Anything that helps from the logs?
Well, this part is still unexplainable -- in the crashd8.txt, the symbol
addresses that were seen by the crashed kernel are as shown:
# grep SYMBOL crashd8.txt
SYMBOL(init_uts_ns)=c06f9120
SYMBOL(node_online_map)=c0730644
SYMBOL(swapper_pg_dir)=c06e4000
SYMBOL(_stext)=c0101000
SYMBOL(vmlist)=c07d3540
SYMBOL(mem_map)=c07d3500
SYMBOL(contig_page_data)=c072ce80
SYMBOL(log_buf)=c06fc83c
SYMBOL(log_end)=c07bb7ec
SYMBOL(log_buf_len)=c06fc838
SYMBOL(logged_chars)=c07c38a0
#
But the "sym.l" list starts with a unity-mapped PAGE_OFFSET
value of c1000000 (instead of the more common c0000000)
c1000000 (T) _text
c1000000 (T) startup_32
c1000054 (t) default_entry
c1001000 (T) _stext
c1001010 (T) do_one_initcall
c1001180 (t) init_post
c10012c0 (T) name_to_dev_t
c1001500 (T) thread_saved_pc
c1001510 (T) prepare_to_copy
c1001590 (T) get_wchan
c1001640 (T) __switch_to
...
So that being the case, the symbol values for "init_uts_ns", "node_online_map",
and so on, don't even match those of the crashed kernel:
c1662120 (D) init_uts_ns
c1716000 (B) swapper_pg_dir
c1001000 (T) _stext
c173ed3c (B) vmlist
c173ed00 (B) mem_map
c1696180 (D) contig_page_data
c17248a0 (b) __log_buf
c17247ec (b) log_end
c16656b8 (d) log_buf_len
c172c8a0 (b) logged_chars
So that doesn't make any sense unless the vmlinux file and the vmlinux that
was running on the crashed kernel are not the same kernels. Are you using
a different kernel as the secondary kdump kernel?
Dave
node_online_map doesn't even exist in your sym.l file.
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