Re: Dom0 ballooning: crash on guest start

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

On Fri, 29 Apr 2011 11:14:54 +0200, Christoph Egger wrote:
> Then when I start a HVM guest the balloon driver crashes:
>
> balloon0: current reservation: 2039476 pages => target: 2039476 pages
> balloon0: current reservation: 2039476 pages => target: 981172 pages
> uvm_fault(0xffffffff80c6b220, 0xffffffff81400000, 1) -> e
> fatal page fault in supervisor mode
> trap type 6 code 0 rip ffffffff8054584d cs e030 rflags 10216 cr2
> ffffffff81400000 cpl 0 rsp ffffa00057ca8a50
> kernel: page fault trap, code=0
> Stopped in pid 0.58 (system) at netbsd:pmap_zero_page+0x41:     movq 
> 0(%rax,%
> rbx,8),%rbx
> pmap_zero_page() at netbsd:pmap_zero_page+0x41
> uvm_pagealloc_strat() at netbsd:uvm_pagealloc_strat+0x22d
> bpge_ctor() at netbsd:bpge_ctor+0x22

Hmm, a fault while zeroing the page. Race, TLB out of sync, or maybe 
developer's (my) mistake :o

Is this kernel compiled with DIAGNOSTIC?

--
Jean-Yves Migeon
jeanyves.migeon%free.fr@localhost