Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1209278

Re: omapdss: Division by zero in kernel

Show all headers | View raw

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: omapdss: Division by zero in kernel Pali Rohár <pali.rohar@gmail.com> - 2015-08-18 16:10 +0200

csiph-web