softdep panic while low on memory during "make buildworld"
pavalos at theshell.com
Fri Jan 25 15:50:01 PST 2008
On Fri, Jan 25, 2008 at 11:51:18AM -0800, Matthew Dillon wrote:
> This has happened to me on a virtual machine too.
It happens to me on a real live kernel.
> First, some background... softdeps holds onto buffers which have
> dependancies, so if buf_deallocate() is EVER called on a softdep
> bp, all softdep's callback does is panic because the situation is
> not supposed to happen.
> I haven't been able to track it down yet. The panic does not occur
> very often at all and I was in the middle of some HAMMER debugging
> when I got it and didn't want to switch modes, so to speak :-). It
> has only happened to me once so far.
> The VKERNEL's timing is very different from a normal kernel, and
> most people run it with significantly less 'memory' then a real
> kernel (I specify 64MB for the one I test HAMMER in, similar to
> the 64MB vkernel you were using), and those differences tend to bring
> out software bugs that are not normally apparent when running a
> real kernel.
I have 2G of RAM, and I'm able to reproduce this if I really stress the
machine. I've turned off softupdates since this was killing my
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