Re: kmalloc and other memory allocation failures.

[Thomas Petazzoni <thomas.petazzoni@xxxxxxxx>]

Hi,

Le Thu, 2 Aug 2007 14:22:08 -0600,
Bruce Rowen <browen@xxxxxxxxxxxx> a écrit :

> __asm__ __volatile__(
> c016d3ee:       49                      dec    %ecx
> c016d3ef:       78 08                   js     c016d3f9  
> <__register_chrdev_region+0x69>
> -> c016d3f1:       ac                      lods   %ds:(%esi),%al
> c016d3f2:       aa                      stos   %al,%es:(%edi)
> c016d3f3:       84 c0                   test   %al,%al

I'm not an expert, but I think that this lods/stos sequence is the code
of strncpy() [1], used in __register_chrdev_region() to copy the
provided 'name' to 'cd->name'. It looks like the 'name' pointer passed
to the function was null.

> I've reinstalled the 'kmalloc()' call that also tripped:
> 
> BUG: unable to handle kernel NULL pointer dereference at virtual  
> address 00000025

Something looks really bad. Can you send us your full, buildable,
source code ?

Sincerly,

Thomas

[1] http://lxr.free-electrons.com/source/include/asm-i386/string.h#043
-- 
Thomas Petazzoni - thomas.petazzoni@xxxxxxxx
http://{thomas,sos,kos}.enix.org - http://www.toulibre.org
http://www.{livret,agenda}dulibre.org

--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx
Please read the FAQ at http://kernelnewbies.org/FAQ