Subject: Re: Panic with softdep
To: Sean Doran <email@example.com>
From: Martin Husemann <firstname.lastname@example.org>
Date: 12/11/1999 18:25:28
> If you can reliably reproduce it, can you try adjusting
> downwards the desiredvnodes multiplier at the beginning of
> and see if that causes the problem to go away?
I'll check that, but I'm not sure I can reliably reproduce it.
What I've done botht times the panic happened was:
- sup new sources
- build new kernel
- make includes, build usr/src/lib and install it
- make && make install in /usr/src
That was OK. But then I do the regression test: make cleandir && make in
Somewhere during the make the system paniced.
Sometimes I reboot after the make install (before the cleandir and second build)
and I've never seen a panic then.
Has the softdep code some problem with still busy vnodes not referenced any
more from the filesystem (/sbin/init, removed and replaced by the first build)?
BTW, the backtrace I posted showed Xintr5 (the ISDN card) near the bottom, a
lot of stuff above it and then Xintr14 (the IDE controller), but the ISDN
driver never touches a VNODE nor knows anything about softdeps or fs-related
locks, so I guess it's just a coincidence (an ISDN packet arriving, interrupted
by a disk activity, although there were no active ISDN connections at that
time, but there may be D channel backround stuff going on).