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From: Stefan Ehmann <shoesoft@gmx.net>
To: Don Lewis <truckman@FreeBSD.org>
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Date: Sun, 04 Jan 2004 23:46:20 +0100
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cc: current@FreeBSD.org
Subject: Re: page fault panic tracked down (selwakeuppri())
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On Sun, 2004-01-04 at 23:24, Don Lewis wrote:
> On  4 Jan, Stefan Ehmann wrote:
> > I took out the debug options because it was just too slow. Put back
> > INVARIANTS (but no WITNESS) now and speed is nice again.
> 
> This problem is more likely to be caught by INVARIANTS than WITNESS.
> 
> > Applied your suggested changes which resulted in a panic. No
> > assertations were triggered though.
> 
> Bummer!

Updated to plain (= no patches/hacks) again, also put in the
DEBUG_VFS_LOCKS.

For the first time I got a backtrace that ended in the soundcard module
- So maybe this is the right direction (on the other hand this might be
some newly introduced error)

panic: bad bufsize
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc04e5198 in boot (howto=256) at
/usr/src/sys/kern/kern_shutdown.c:372
#2  0xc04e5527 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc07ec648 in feed_vchan_s16 () from /boot/kernel/snd_pcm.ko
#4  0xc07e2c6d in sndbuf_feed () from /boot/kernel/snd_pcm.ko
#5  0xc07e3225 in chn_wrfeed () from /boot/kernel/snd_pcm.ko
#6  0xc07e327c in chn_wrintr () from /boot/kernel/snd_pcm.ko
#7  0xc07e3990 in chn_intr () from /boot/kernel/snd_pcm.ko
#8  0xc07fca2f in csa_intr () from /boot/kernel/snd_csa.ko
#9  0xc07fb724 in csa_intr () from /boot/kernel/snd_csa.ko
#10 0xc04d1692 in ithread_loop (arg=0xc1737b00)
    at /usr/src/sys/kern/kern_intr.c:544
#11 0xc04d0684 in fork_exit (callout=0xc04d1500 <ithread_loop>, arg=0x0,
    frame=0x0) at /usr/src/sys/kern/kern_fork.c:796

Nearly all other panics (I put a collection of ~20 backtraces on
http://stud4.tuwien.ac.at/~e0125637/fbsd/ if it's of any interest) ended
up in file system code.