It seems to be related to changes in uvm_loan.c
as uvm_loan() is now able to return with uobj/anon locked as we might get a
return value of 0 from uvm_loanentry. That might happen if uvm_loanentry
returns while in the first iteration of the while loop with rv == 0
Am not sure but it does not look right the way it is....

Lars Heidieker wrote:

> Hi,
>
> since about 4 days there is some looking problem within the memory
> system
> If I do a dd if=/dev/zero of=test bs=1m count=256 on a 256mb machine the
> system looks up at the point where the pagescanner starts within
> uvm_pageout, no panic no brek to debugger it just hangs..
>
> lars