Re: page fault panic tracked down (selwakeuppri())

From: Stefan Ehmann (shoesoft_at_gmx.net)
Date: 12/30/03

  • Next message: Fabry: "Re: Fw: ACPI / APM problems" 
    To: Bruce Evans <bde@zeta.org.au>
Date: Tue, 30 Dec 2003 15:30:16 +0100

    On Tue, 2003-12-30 at 07:56, Bruce Evans wrote:
    > On Sun, 28 Dec 2003, Stefan Ehmann wrote:
    >
    > > Some weeks ago I posted about a panic in 5.2-BETA.
    > >
    > > After accessing a read-only ext2fs for some hours I got a "page fault"
    > > panic (or rarely a "getblk: size(7537385) > MAXBSIZE(65536)"). The
    > > backtrace was always somewhat different. You can read about it a bit
    > > more detailed here:
    > >
    > > http://lists.freebsd.org/pipermail/freebsd-current/2003-November/015405.html
    > >
    > > After lots of buildworld and buildkernel I finally was able to detect
    > > the commit that caused this panic.
    > >
    > > Current from 2003.11.09.09.00.00 runs fine for > 10 hours. Current from
    > > 2003.11.09.09.20.00 crashed twice within less than 2 hours.
    > >
    > > The only src/sys commit in that time is
    > > http://lists.freebsd.org/pipermail/cvs-src/2003-November/013515.html
    > > where selwakeup()s is replaced with selwakeuppri().
    > >
    > > So the problem must be somewhere in selwakeuppri().
    > >
    > > I hope this can be resolved now.
    >
    > The selwakeuppri() changes aren't very related to this. They shouldn't
    > affect anything except scheduling, so it looks like they just expose an
    > old race.
    >
    > I suspect the locking changes on 2003/08/28 (ext2fs/fs.h rev.1.14
    > etc.). These were obviously wrong since they broke syncing of dirty
    > buffers, especially at reboot time, but I didn't previously suspect
    > that they had locking problems. The message in the above URL doesn't
    > seem to have much to do with ext2fs, but it shows a panic in lockmgr()
    > and the 2003/08/28 changes cause lockmgr() to be used with a different
    > owner.
    >
    > I have farily large patches which do buffering in ext2fs in a different
    > way so that the 2003/08/28 changes are irrelevant. I will send these
    > in private mail.

    Applied the patches and rebuilt kernel. Unfortunately I got the same
    panic after 2 hours.

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