RE: [Xen-devel] Fwd: NetBSD xl core-dump not working... Memory fault (core dumped)

[James Harper <james.harper%bendigoit.com.au@localhost>]

> 
> I've been working with Mike on this today. After he re-applied the patch
> (something must have gone wrong initially), an ioctl error is repeated
> constantly instead of SIGSEGV:
> 
> xc: error: xc_map_foreign_range: ioctl failed (14 = Bad address): Internal
> error
> 
> I dumped out some of the variables though, and:
> 
> nr_memory_map = 1
> pfn_start = 0, pfn_end = 1048575
> 
> this equates to 4GB of pfn's to be dumped on a vm with mem/maxmem =
> 256MB... is there code that skips empty pages? If not, that seems to be the
> explanation for the errors.
> 

A bit more info with a bit more debugging printf's, and removing the perror in 
xc_map_foreign_range:

nr_pages = 64472
nr_memory_map = 1
map_idx = 0
 pfn_start = 0, pfn_end = 1048575
xc: info: j (63456) != nr_pages (64472)

The resulting dump file is readable by my xen->windows dump converter, and the 
windows debugger doesn't complain about the resulting windows dump file, so it 
seems to be working okay.

James