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Re: Dom0 ballooning: crash on guest start

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,%
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

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