Re: kern/47041 (amd64 kernel core dumps are broken)

[Chuck Silvers <chuq%chuq.com@localhost>]

On Sat, Jan 12, 2013 at 08:56:52AM +0000, Taylor R Campbell wrote:
> It's not clear to me whether this is just because the dump is bad or
> because savecore is still broken, but when I tried to run savecore
> after the last panic (unless I have mixed up panics in my memory,
> which is entirely possible at this hour), it started off by saying
> 
> savecore: kvm_read: invalid translation (invalid level 3 PDE)
> 
> but proceeded to start writing a core dump to disk.  In the morning
> (it's a 32 GB dump being written to a sync ffs) I'll see whether gdb
> finds this core dump digestible.

not all kvm_read errors are fatal for savecore, so your recollection
could be correct.

enabling machdep.sparse_dump=1 will help with large-memory systems.
that should be working now as well.

-Chuck