[issue715] panic at shutdown using comconsole

[Nicolas Thery]

2009/2/20 Thomas Nikolajsen (via DragonFly issue tracker) > (kgdb) frame 18
> #18 0xc01fff05 in spec_close (ap=0xe8d8b9a8) at /usr/src/sys/vfs/specfs/
> spec_vnops.c:740
> 740                     error = dev_dclose(dev, ap->a_fflag, S_IFCHR);
> (kgdb) print p
> $1 = (struct proc *) 0xe8f0d218
> (kgdb) print p->p_session
> There is no member named p_session.

Sorry I forgot that p_session is a macro.

> (kgdb) print p->p_pgrp
> $2 = (struct pgrp *) 0xe9167ec0
> (kgdb) print p->p_pgrp->pg_session
> $3 = (struct session *) 0xd3ba1a60
> (kgdb) print p->p_pgrp->pg_session->s_ttyvp
> $4 = (struct vnode *) 0x0

Cool.  That's consistent with my hypothesis.  I reckon it was
nullified when executing the body of the 2nd if statement in
spec_close().  I'll fix it tonight.

Thanks a lot.

Nicolas