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 productivity.
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