Date: Tue, 16 Sep 2008 11:25:44 -0400 From: John Baldwin <jhb@freebsd.org> To: Matthias Apitz <guru@unixarea.de> Cc: freebsd-hackers@freebsd.org, bug-followup@freebsd.org, freebsd-net@freebsd.org Subject: Re: kern/122331: panic's on KDE-launches (but only in WPA Wifi area) Message-ID: <200809161125.45034.jhb@freebsd.org> In-Reply-To: <20080915222414.GA12474@rebelion.Sisis.de> References: <20080915110838.GA5258@rebelion.Sisis.de> <200809151608.06738.jhb@freebsd.org> <20080915222414.GA12474@rebelion.Sisis.de>
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On Monday 15 September 2008 06:24:14 pm Matthias Apitz wrote:
> El día Monday, September 15, 2008 a las 04:08:06PM -0400, John Baldwin
escribió:
>
> > > > Can you go to frame 7 in kgdb and 'p *fdp'?
> > >
> > > (kgdb) frame 7
> > > #7 0xc0788b98 in kern_select (td=0xc49d5630, nd=9, fd_in=0x298ad840,
> > > fd_ou=0x298ad9c4, fd_ex=0x298adb48, tvp=0x0) at filedesc.h:136
> > > return (fd < 0 || fd >= fdp->fd_nfiles ? NULL : fdp->fd_ofiles[fd]);
> > > (kgdb) p *fdp
> > > Variable "fdp" is not available.
> > > (kgdb)
> >
> > If 'td' is available then you can do 'p *td->td_proc->p_fd'
>
> (kgdb) frame 7
> #7 0xc0788b98 in kern_select (td=0xc49d5630, nd=9, fd_in=0x298ad840,
> fd_ou=0x298ad9c4, fd_ex=0x298adb48, tvp=0x0) at filedesc.h:136
> 136 return (fd < 0 || fd >= fdp->fd_nfiles ? NULL :
> fdp->fd_ofiles[fd]);
> (kgdb) p td
> $7 = (struct thread *) 0xc49d5630
> (kgdb) p *td->td_proc->p_fd
> $8 = {fd_ofiles = 0x0, fd_ofileflags = 0x0, fd_cdir = 0x0,
Well, fd_ofiles being NULL here is really odd. It's also odd that you have no
current directory. Because fd_nfiles is 20, fd_ofiles should be pointing to
the static file descriptor array. Off the top of my head I don't see how
this is happening. It might help if you can narrow down exactly what WPA
operation you are doing that causes the panic.
--
John Baldwin
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