Kernel hang on 6.x
jhb at freebsd.org
Thu Jan 4 18:09:25 UTC 2007
On Thursday 04 January 2007 10:27, Brian Dean wrote:
> On Wed, Dec 27, 2006 at 11:50:43PM -0500, John Baldwin wrote:
> > The 'traceall' seemed to miss several threads actually (like pid
> > 18). Can you get a 'ps'? Also, are you able to get a kernel dump
> > when this happens?
> I can't ps that particular session since it is no longer available,
> however I can reproduce another one and generate a new set of debug
> output. One note, the "swap_pager: indefinite wait buffer: ..."
> timeout message may have been a result of a misconfigured secondary
> swap file, so that might be a red herring. However, we can still
> reliably reproduce the hang with 32 Gig swap, but we don't get any
> console messages associated with it.
> The system is set up as a test system so I'm not under any pressure to
> get it rebooted and back up when it hangs, so I have the ability to
> take some time to debug it.
> I believe that I can generate a kernel dump. We tried this yesterday
> but didn't have a dump device configured. I think we've got that set
> up now and plan to generate a kernel dump. I'm assuming that since
> the process size and swap size is so large, that the dump size is
> going to be very large also, on the order of 32 Gig. I beleive I can
> host this on a server and make it accessible to you if you are willing
> to download it.
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
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