From: "Pali Rohár" <pali.rohar@gmail.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>,
Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
Jyri Sarha <jsarha@ti.com>
Cc: linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Pavel Machek <pavel@ucw.cz>,
Sebastian Reichel <sre@kernel.org>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
Tony Lindgren <tony@atomide.com>, Nishanth Menon <nm@ti.com>
Subject: Re: omapdss: Division by zero in kernel
Date: Tue, 18 Aug 2015 14:00:02 +0000 [thread overview]
Message-ID: <20150818140002.GU32236@pali> (raw)
In-Reply-To: <20150728115602.GL13765@pali>
On Tuesday 28 July 2015 13:56:02 Pali Rohár wrote:
> On Friday 24 July 2015 18:03:42 Pali Rohár wrote:
> > Hello,
> >
> > when on N900 (real HW or qemu) I run this command
> >
> > / # echo 0 > /sys/devices/platform/omapdss/overlay0/enabled && echo 0 > /sys/class/graphics/fb0/size
> >
> > then kernel crash with this error message
> >
> > / # [ 29.904113] Division by zero in kernel.
> > ** 3375 printk messages dropped ** [ 29.963836] [<c01e0008>] (__aeabi_uidivmod) from [<c022071c>]
> > (cfb_imageblit+0xac/0x464)
> > ** 8426 printk messages dropped ** [ 30.111083] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8380 printk messages dropped ** [ 30.258209] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7813 printk messages dropped ** [ 30.400054] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7666 printk messages dropped ** [ 30.538391] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7687 printk messages dropped ** [ 30.676544] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7960 printk messages dropped ** [ 30.819915] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8317 printk messages dropped ** [ 30.966979] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8590 printk messages dropped ** [ 31.122528] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8885 printk messages dropped ** [ 31.287658] [<c0218ed0>] (fbcon_scroll) from [<c025af90>] (scrup+0x60/0x128)
> > ** 9408 printk messages dropped ** [ 31.461425] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 9787 printk messages dropped ** [ 31.644287] [<c02187e8>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10081 printk messages dropped ** [ 31.833984] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10501 printk messages dropped ** [ 32.031066] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10816 printk messages dropped ** [ 32.233001] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10900 printk messages dropped ** [ 32.440490] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 32.645233] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 32.848999] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 33.053833] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10838 printk messages dropped ** [ 33.258361] [<c0218ed0>] (fbcon_scroll) from [<c025af90>] (scrup+0x60/0x128)
> >
> > I suspect that problem is in omapdss.
> >
> > I do not know if size 0 make sense, but Maemo userspace is calling above
> > commands and on Nokia's 2.6.28 kernel there is no crash or error message.
> >
> > IMHO Division by zero in kernel should not be there even if userspace
> > call "incorrect" command.
> >
>
> PING! Any idea what to do with Division by zero in kernel?
>
PING again! Can somebody look at this Division by zero in kernel?
--
Pali Rohár
pali.rohar@gmail.com
WARNING: multiple messages have this Message-ID (diff)
From: "Pali Rohár" <pali.rohar@gmail.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>,
Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
Jyri Sarha <jsarha@ti.com>
Cc: linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Pavel Machek <pavel@ucw.cz>,
Sebastian Reichel <sre@kernel.org>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
Tony Lindgren <tony@atomide.com>, Nishanth Menon <nm@ti.com>
Subject: Re: omapdss: Division by zero in kernel
Date: Tue, 18 Aug 2015 16:00:02 +0200 [thread overview]
Message-ID: <20150818140002.GU32236@pali> (raw)
In-Reply-To: <20150728115602.GL13765@pali>
On Tuesday 28 July 2015 13:56:02 Pali Rohár wrote:
> On Friday 24 July 2015 18:03:42 Pali Rohár wrote:
> > Hello,
> >
> > when on N900 (real HW or qemu) I run this command
> >
> > / # echo 0 > /sys/devices/platform/omapdss/overlay0/enabled && echo 0 > /sys/class/graphics/fb0/size
> >
> > then kernel crash with this error message
> >
> > / # [ 29.904113] Division by zero in kernel.
> > ** 3375 printk messages dropped ** [ 29.963836] [<c01e0008>] (__aeabi_uidivmod) from [<c022071c>]
> > (cfb_imageblit+0xac/0x464)
> > ** 8426 printk messages dropped ** [ 30.111083] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8380 printk messages dropped ** [ 30.258209] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7813 printk messages dropped ** [ 30.400054] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7666 printk messages dropped ** [ 30.538391] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7687 printk messages dropped ** [ 30.676544] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 7960 printk messages dropped ** [ 30.819915] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8317 printk messages dropped ** [ 30.966979] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8590 printk messages dropped ** [ 31.122528] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 8885 printk messages dropped ** [ 31.287658] [<c0218ed0>] (fbcon_scroll) from [<c025af90>] (scrup+0x60/0x128)
> > ** 9408 printk messages dropped ** [ 31.461425] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 9787 printk messages dropped ** [ 31.644287] [<c02187e8>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10081 printk messages dropped ** [ 31.833984] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10501 printk messages dropped ** [ 32.031066] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10816 printk messages dropped ** [ 32.233001] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10900 printk messages dropped ** [ 32.440490] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 32.645233] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 32.848999] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10837 printk messages dropped ** [ 33.053833] [<c02187a4>] (fbcon_redraw.isra.12) from [<c0218ed0>]
> > (fbcon_scroll+0x6a0/0xcbc)
> > ** 10838 printk messages dropped ** [ 33.258361] [<c0218ed0>] (fbcon_scroll) from [<c025af90>] (scrup+0x60/0x128)
> >
> > I suspect that problem is in omapdss.
> >
> > I do not know if size 0 make sense, but Maemo userspace is calling above
> > commands and on Nokia's 2.6.28 kernel there is no crash or error message.
> >
> > IMHO Division by zero in kernel should not be there even if userspace
> > call "incorrect" command.
> >
>
> PING! Any idea what to do with Division by zero in kernel?
>
PING again! Can somebody look at this Division by zero in kernel?
--
Pali Rohár
pali.rohar@gmail.com
next prev parent reply other threads:[~2015-08-18 14:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 16:03 omapdss: Division by zero in kernel Pali Rohár
2015-07-24 16:03 ` Pali Rohár
2015-07-28 11:56 ` Pali Rohár
2015-07-28 11:56 ` Pali Rohár
2015-08-18 14:00 ` Pali Rohár [this message]
2015-08-18 14:00 ` Pali Rohár
2015-08-18 14:11 ` Peter Teoh
2015-08-18 14:11 ` Peter Teoh
2015-08-19 8:11 ` Pali Rohár
2015-08-19 8:11 ` Pali Rohár
2015-09-17 5:16 ` Pavel Machek
2015-09-17 5:16 ` Pavel Machek
2015-09-25 11:34 ` Pali Rohár
2015-09-25 11:34 ` Pali Rohár
2015-08-21 8:42 ` Tomi Valkeinen
2015-08-21 8:42 ` Tomi Valkeinen
2015-08-21 8:42 ` Tomi Valkeinen
2015-08-21 8:48 ` Pali Rohár
2015-08-21 8:48 ` Pali Rohár
2015-08-21 9:17 ` Tomi Valkeinen
2015-08-21 9:17 ` Tomi Valkeinen
2015-08-21 9:17 ` Tomi Valkeinen
2015-08-26 10:16 ` Pali Rohár
2015-08-26 10:16 ` Pali Rohár
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