::Hi,
::
::I got this crash while make buildworld was running inside a vkernel and xor=
::g was
::compiling in the real host.
::
::I'm attaching screenshots of the crash and trace.
::
::Regards,
::Nuno
:
: That is one I haven't seen before. I will attempt to reproduce it.
:
: A kernel crash dump would be nice, it shouldn't be possible for it
: to get a null-pointer derefence there. Hmmm.
:
: -Matt
I think I know what is going on here. There are a couple of places
in the pmap code where the PV list is being scanned and in the
particular place shown in the snapshot you took, it is possible that
a page with active I/O on it (i.e. when the system is under a heavy
paging load) can cause the calling process to block. This can cause
the list scan to go stale and blow up in our faces.
I will commit a workaround.
-Matt
Matthew Dillon
<[EMAIL PROTECTED]>
