kernel BUG message while using jffs2

kernel BUG message while using jffs2

[Alexandru Damian]

Hello,

Sorry for posting here, it seems the best spot; if I need to redirect
this to mtd-utils team, please tell me.

I'm playing around with some jffs2 files. While trying to mount (via
block2mtd, loop) a jffs2 system, a "kernel BUG message" appeared in
dmesg, with these lines:

kernel BUG at mm/slub.c:2204!
invalid opcode: 0000 [#1]
SMP

Call trace is

Call Trace:
 [<c0477358>] __kmalloc+0xd/0x64
 [<f950d626>] jffs2_scan_medium+0x2a5/0x131a [jffs2]
 [<c046137d>] __alloc_pages+0x68/0x2a0
 [<f9516f4b>] jffs2_sum_init+0x50/0x9d [jffs2]


If someone is interested in digging deeper in this, please contact me
directly by email (I'm not subscribed to the list) for more
information

Cheers,
Alex

Re: kernel BUG message while using jffs2

[David Woodhouse]

On Fri, 2007-11-09 at 17:08 +0200, Alexandru Damian wrote:
> Hello,
> 
> Sorry for posting here, it seems the best spot; if I need to redirect
> this to mtd-utils team, please tell me.
> 
> I'm playing around with some jffs2 files. While trying to mount (via
> block2mtd, loop) a jffs2 system, a "kernel BUG message" appeared in
> dmesg, with these lines:
> 
> kernel BUG at mm/slub.c:2204!

I don't see a BUG() or BUG_ON() anywhere near that line. What version of
the kernel? Precisely what is at that line?

-- 
dwmw2

Re: kernel BUG message while using jffs2

[Alexandru DAMIAN]

I'm running stock kernel on a Fedora 7. uname -a tells 

Linux sandel.gameloft.org 2.6.22.9-91.fc7 #1 SMP Thu Sep 27 23:10:59 EDT
2007 i686 i686 i386 GNU/Linux

In the stock 2.6.22.9 kernel, I see a bugon on slub.c, the code is this:

2196 static struct kmem_cache *get_slab(size_t size, gfp_t flags)
2197 {
2198         int index = kmalloc_index(size);
2199 
2200         if (!index)
2201                 return NULL;
2202 
2203         /* Allocation too large? */
2204         BUG_ON(index < 0);

Hope this helps,

Cheers,
Alex

On Fri, 2007-11-09 at 17:39 -0500, David Woodhouse wrote:
> On Fri, 2007-11-09 at 17:08 +0200, Alexandru Damian wrote:
> > Hello,
> > 
> > Sorry for posting here, it seems the best spot; if I need to redirect
> > this to mtd-utils team, please tell me.
> > 
> > I'm playing around with some jffs2 files. While trying to mount (via
> > block2mtd, loop) a jffs2 system, a "kernel BUG message" appeared in
> > dmesg, with these lines:
> > 
> > kernel BUG at mm/slub.c:2204!
> 
> I don't see a BUG() or BUG_ON() anywhere near that line. What version of
> the kernel? Precisely what is at that line?
>