Kernel hang on 6.x
jhb at freebsd.org
Wed Jan 10 23:06:24 UTC 2007
On Wednesday 10 January 2007 16:52, Brad L. Chisholm wrote:
> On Thu, 4 Jan 2007 12:53:47 -0500, John Baldwin wrote:
> > On Thursday 04 January 2007 10:27, Brian Dean wrote:
> > >
> > > I believe that I can generate a kernel dump. We tried this yesterday
> > > but didn't have a dump device configured.
> > If this is 6.x, turn on minidumps via the sysctl. The dump size normally is
> > the size of RAM. With minidumps it can be a lot smaller. If you get a dump,
> > let me know and I'll point you at some gdb scripts to generate 'ps' type
> > output, etc.
> I work with Brian, and have been helping him analyze this problem. We have
> been able to generate kernel dumps, and have also done some additional
> analysis under ddb. Here is a summary of our analysis so far. Suggestions
> as to how to proceed from here are most welcome.
How much swap do you have? You might have run out of buckets in the
swap_zone before you ran out of swap space, in which case the kernel
deadlocks rather than killing the hog like it does when it runs out of
swap space. I added a printf to catch this on HEAD recently that will
be MFC'd soonish. You can try bumping up kern.maxswzone (loader tunable).
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