propagate_priority panic

[Danny Braniss]

> > 	Not sure if anyone else is seeing this, but I'm pretty sure the following=
> > =20
> > commit broke my system.  When mysql tries to shutdown I get a panic in=20
> > propagate_priority. As well as X freezing when I go to start it.  Actually=
> > =20
> > one of the applictions or the WM causes it to freeze, but same problem I=20
> > think but I can't see the console.  Before this everything worked fine.  I=
> > =20
> > can post the hand transcribed panic backtrace message tomorrow if anyone=20
> > is interested since I don't have a serial port on the machine.
> > I'm using the 4BSD scheduler with the latest -CURRENT.
> > 
> > jhb         2004-12-30 20:52:44 UTC
> > 
> >   FreeBSD src repository
> > 
> >   Modified files:
> >     sys/kern             sched_4bsd.c sched_ule.c subr_turnstile.c=20
> >     sys/sys              proc.h sched.h turnstile.h=20
> >  =20
> >   Revision  Changes    Path
> >   1.71      +102 -14   src/sys/kern/sched_4bsd.c
> >   1.144     +77 -20    src/sys/kern/sched_ule.c
> >   1.151     +120 -71   src/sys/kern/subr_turnstile.c
> >   1.415     +1 -0      src/sys/sys/proc.h
> >   1.23      +2 -0      src/sys/sys/sched.h
> >   1.6       +1 -0      src/sys/sys/turnstile.h
> > =2D-=20
> > Anish Mistry
> 
> in my case it's probably more my fault, since it happens in a driver-module
> that im writing - though i'm begining to think otherwise. Adding
> debug printfs fixes the panics, which most probably means some
> timing problem. The code is experimental, but if someone would like to
> take a look, i've placed it, together with the panic in:
> 	ftp://ftp.cs.huji.ac.il/users/danny/freebsd/panic/
> 

ok, problem solved. I had a kernel thread that exited, while a socket
was being closed.

before:
	while(sp->flags & ISC_RUN)
		sbwait(&so->so_rcv);
	kthread_exit(0);

now:
	while(so->so_state & SS_ISCONNECTED)
		sbwait(&so->so_rcv);
	kthread_exit(0);