Date: Wed, 25 Feb 2009 14:40:04 GMT From: John Baldwin <jhb@freebsd.org> To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/132042: drm module crash the system when closing gnome session Message-ID: <200902251440.n1PEe43L079768@freefall.freebsd.org>
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The following reply was made to PR amd64/132042; it has been noted by GNATS.
From: John Baldwin <jhb@freebsd.org>
To: freebsd-amd64@freebsd.org
Cc: Olivier Cochard-Labbe <olivier@freenas.org>,
freebsd-gnats-submit@freebsd.org, rnoland@freebsd.org
Subject: Re: amd64/132042: drm module crash the system when closing gnome session
Date: Wed, 25 Feb 2009 09:19:19 -0500
On Tuesday 24 February 2009 1:40:21 am Olivier Cochard-Labbe wrote:
>
> >Number: 132042
> >Category: amd64
This is drm specific and not amd64-specific.
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address = 0x258
> fault code = supervisor read data, page not present
>
> #7 0xffffffff8050c34e in calltrap () at /usr/src/sys/amd64/amd64/exception.S:209
> #8 0xffffffff802d47aa in _mtx_lock_sleep (m=0xffffff000348a968, tid=18446742974229954560, opts=Variable "opts" is not available.
> ) at /usr/src/sys/kern/kern_mutex.c:339
> #9 0xffffffff802d4b5f in _mtx_lock_flags (m=Variable "m" is not available.
> ) at /usr/src/sys/kern/kern_mutex.c:186
> #10 0xffffffffaf18c11d in i915_irq_wait (kdev=Variable "kdev" is not available.
> ) at /usr/src/sys/modules/drm/i915/../../../dev/drm/i915_irq.c:117
> #11 0xffffffffaf194179 in drm_ioctl (kdev=0xffffff0001f76400, cmd=2147771461, data=0xffffff002f9d11d0 "\031Y", flags=67,
> p=0xffffff0001e8c000) at /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_drv.c:911
> #12 0xffffffff802ab4d2 in giant_ioctl (dev=0xffffff0001f76400, cmd=2147771461, data=0xffffff002f9d11d0 "\031Y", fflag=67,
> td=0xffffff0001e8c000) at /usr/src/sys/kern/kern_conf.c:408
>
> (kgdb) up 10
> #10 0xffffffffaf18c11d in i915_irq_wait (kdev=Variable "kdev" is not available.
> ) at /usr/src/sys/modules/drm/i915/../../../dev/drm/i915_irq.c:117
> 117 DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
>
>
> (kgdb) list *0xffffffff802d47aa
Please go to frame 8 and 'p *m'. If the 'mtx_lock' member is 6, then the
mutex is destroyed and it is a use-after-free bug in drm(4).
--
John Baldwin
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