Date: Tue, 16 Sep 2008 19:50:04 GMT From: John Baldwin <jhb@freebsd.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/122331: panic's on KDE-launches (but only in WPA Wifi area) Message-ID: <200809161950.m8GJo4dQ060872@freefall.freebsd.org>
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The following reply was made to PR kern/122331; it has been noted by GNATS.
From: John Baldwin <jhb@freebsd.org>
To: Matthias Apitz <guru@unixarea.de>
Cc: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org,
bug-followup@freebsd.org
Subject: Re: kern/122331: panic's on KDE-launches (but only in WPA Wifi area)
Date: Tue, 16 Sep 2008 11:25:44 -0400
On Monday 15 September 2008 06:24:14 pm Matthias Apitz wrote:
> El d=EDa Monday, September 15, 2008 a las 04:08:06PM -0400, John Baldwin=
=20
escribi=F3:
>=20
> > > > Can you go to frame 7 in kgdb and 'p *fdp'?
> > >=20
> > > (kgdb) frame 7
> > > #7 0xc0788b98 in kern_select (td=3D0xc49d5630, nd=3D9, fd_in=3D0x298=
ad840,=20
> > > fd_ou=3D0x298ad9c4, fd_ex=3D0x298adb48, tvp=3D0x0) at filedesc.h:=
136
> > > return (fd < 0 || fd >=3D fdp->fd_nfiles ? NULL : fdp->fd_ofiles[fd=
]);
> > > (kgdb) p *fdp
> > > Variable "fdp" is not available.
> > > (kgdb)=20
> >=20
> > If 'td' is available then you can do 'p *td->td_proc->p_fd'
>=20
> (kgdb) frame 7
> #7 0xc0788b98 in kern_select (td=3D0xc49d5630, nd=3D9, fd_in=3D0x298ad84=
0,=20
> fd_ou=3D0x298ad9c4, fd_ex=3D0x298adb48, tvp=3D0x0) at filedesc.h:136
> 136 return (fd < 0 || fd >=3D fdp->fd_nfiles ? NULL :
> fdp->fd_ofiles[fd]);
> (kgdb) p td
> $7 =3D (struct thread *) 0xc49d5630
> (kgdb) p *td->td_proc->p_fd
> $8 =3D {fd_ofiles =3D 0x0, fd_ofileflags =3D 0x0, fd_cdir =3D 0x0,=20
Well, fd_ofiles being NULL here is really odd. It's also odd that you have=
no=20
current directory. Because fd_nfiles is 20, fd_ofiles should be pointing t=
o=20
the static file descriptor array. Off the top of my head I don't see how=20
this is happening. It might help if you can narrow down exactly what WPA=20
operation you are doing that causes the panic.
=2D-=20
John Baldwin
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