---------------------------------------------------
The Following is Jeff's Reply. It ended up offlist
due to my stupidity. Sorry.
jez
---------------------------------------------------
On Sun, Apr 01, 2007 at 06:05:04PM +0200, jez wrote:
> It's quite odd. I also tried using 0x60 and also putting them between the
> stack and the end of user-space mem at 0xbfafe000. Each time I get the
> same error, with the same address, 0x08051068.
>
> -- Output --
> (gdb) x 0x08051068
> 0x8051068 <alloc_node_mem_map+72>: 0xac868bc3
> (gdb) disassemble 0x08051068
> Dump of assembler code for function alloc_node_mem_map:
> ...
> 0x08051068 <alloc_node_mem_map+72>: ret
> ...
> -- End --
This is the UML 0x08051068, whereas the error message is referring to
libc's 0x08051068.
> > Yeah, CONFIG_STUB_* would turn into something like
> > CONFIG_STUB_* -level*2*PAGE_SIZE
> >
>
> Now here's something strange. I initially assumed that there were only
> two pages, so when I was changing the stub mappings, I first tried:
>
> CONFIG_STUB_CODE=0xbfffc000
> CONFIG_STUB_DATA=0xbfffd000
> CONFIG_STUB_START=0xbfffc000
That should be OK.
> What's wired is that this returns the mmap error:
>
> mapping mmap stub failed, errno = 12
> Kernel panic - not syncing: start_userspace : expected SIGSTOP, got status
> = 256
>
> This got me to thinking that maybe the CONFIG_STUB_START indicated the
> top of a downward-growing stack or something. Are you saying that these
> pages should actually be free, or have I just misunderstood?
No, they are just two pages, no stack growth or anything.
Jeff
--
Work email - jdike at linux dot intel dot com
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