Date: Thu, 4 Jan 2007 12:53:47 -0500 From: John Baldwin <jhb@freebsd.org> To: Brian Dean <bsd@bsdhome.com> Cc: freebsd-hackers@freebsd.org, "R. Tyler Ballance" <tyler@bleepsoft.com>, Brian Dean <bsd@freebsd.org> Subject: Re: Kernel hang on 6.x Message-ID: <200701041253.48092.jhb@freebsd.org> In-Reply-To: <20070104152754.GA94609@neutrino.bsdhome.com> References: <20061214190510.GA26590@neutrino.bsdhome.com> <200612272350.43680.jhb@freebsd.org> <20070104152754.GA94609@neutrino.bsdhome.com>
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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 output, etc. -- John Baldwin
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