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SubjectRe: BUG at mm/mmap.c:2309 when cx18.ko and cx18-alsa.ko loaded
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Date
On Sun, 2011-03-06 at 16:04 -0500, Andy Walls wrote:
> On Sun, 2011-03-06 at 10:37 -0800, Hugh Dickins wrote:

> >
> > Thanks for all the effort you are putting into investigating this: you
> > deserve a better response than I can give you.
> >
> > mm/vmalloc.c's vmap_area handling is entirely separate from
> > mm/mmap.c's vm_area_struct handling, yet both misbehaviors would be
> > explained if a next pointer has been corrupted to NULL.
> >
> > Probably just coincidence that they both manifest that way, though the
> > underlying problem may turn out to be one.

> > If you have not already, it would be well worth turning on
> > CONFIG_DEBUG_LIST and CONFIG_DEBUG_SLAB or CONFIG_SLUB_DEBUG with
> > CONFIG_SLUB_DEBUG_ON.

>
> > But you are having trouble
> > reproducing it yourself?
>
> I can't say yet. I'm currently two for two.

After backing up the machine and testing again, I'm now 3 for 3.

This time it happened in the memset() in kernel/module.c:move_module()
when modprobe was trying to load the cx18-alsa.ko module.

static int move_module(struct module *mod, struct load_info
*info)
{
int i;
void *ptr;

/* Do the allocs. */
ptr = module_alloc_update_bounds(mod->core_size);
/*
* The pointer to this block is stored in the module structure
* which is inside the block. Just mark it as not being
a
* leak.
*/
kmemleak_not_leak(ptr);
if (!ptr)
return -ENOMEM;

memset(ptr, 0, mod->core_size); <----- Ooops/BUG

/home/andy/cx18dev/git/media_tree/kernel/module.c:2529
385c: 41 8b 8c 24 64 01 00 mov 0x164(%r12),%ecx
3863: 00
3864: 31 c0 xor %eax,%eax
3866: 48 89 d7 mov %rdx,%rdi
3869: f3 aa rep stos %al,%es:(%rdi) <----- Oops/BUG

ptr had a value of 0x0000000000001000

I'm starting a git bisect now.

Regards,
Andy



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