How to understand and turn off such a oops

How to understand and turn off such a oops

[Park Lee]

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Hi,
  Sometimes, when I call kmalloc() in Linux kernel,
the kernel always bring out a oops shown as following:


Debug: sleeping function called from invalid context
at mm/slab.c:1980
in_atomic():1, irqs_disabled():0
Call Trace: [<0211691d>]  [<02130a17>]  [<02189857>] 
[<021837a6>]  [<02294651>]  [<02118840>]  [<021189cd>]
 [<02263e84>]  [<0227a3e4>]  [<0227a465>] 
[<0227a953>]  [<0218befb>]  [<0218bc23>]  [<02194118>]
 [<0218d90d>]  [<0218c25f>]  [<0218b132>] 
[<021894f4>]  [<021895f5>]  [<0217f686>]  [<0217f728>]
 [<021835ff>]
[<0227ac21>]  [<0227452a>]  [<0227af39>]  [<0227b3cd>]
 [<02264f19>]  [<022652e7>]  [<02253332>] 
[<1195048f>]  [<119506af>]  [<02253495>]  [<0211af6d>]
 [<021078b1>]  =======================
 [<02107337>]  [<118aeb59>]  [<118aefba>] 
[<118adab2>]  [<02116b21>]  [<02116b21>]  [<022a2301>]
 [<02115ed2>]  [<118afbfe>]  [<02116b21>] 
[<02116b21>]  [<118afb58>]  [<118afb5e>]  [<021041cd>]


  After I transform it with ksymoops, it looks like
this:


ksymoops 2.4.9 on i686 2.6.5-1.358custom.  Options
used
     -V (default)
     -K (specified)
     -L (specified)
     -o /lib/modules/2.6.5-1.358custom/ (default)
     -m /boot/System.map (specified)

No modules in ksyms, skipping objects
Call Trace: [<0211691d>]  [<02130a17>]  [<02189857>] 
[<021837a6>]  [<02294651>]  [<02118840>]  [<021189cd>]
 [<02263e84>]  [<0227a3e4>]  [<0227a465>] 
[<0227a953>]  [<0218befb>]  [<0218bc23>]  [<02194118>]
 [<0218d90d>]  [<0218c25f>]  [<0218b132>] 
[<021894f4>]  [<021895f5>]  [<0217f686>]  [<0217f728>]
 [<021835ff>]
[<0227ac21>]  [<0227452a>]  [<0227af39>]  [<0227b3cd>]
 [<02264f19>]  [<022652e7>]  [<02253332>] 
[<1195048f>]  [<119506af>]  [<02253495>]  [<0211af6d>]
 [<021078b1>]  =======================
 [<02107337>]  [<118aeb59>]  [<118aefba>] 
[<118adab2>]  [<02116b21>]  [<02116b21>]  [<022a2301>]
 [<02115ed2>]  [<118afbfe>]  [<02116b21>] 
[<02116b21>]  [<118afb58>]  [<118afb5e>]  [<021041cd>]
Warning (Oops_read): Code line not seen, dumping what
data is available

Trace; 0211691d <__might_sleep+80/8a>
Trace; 02130a17 <__kmalloc+40/76>
... ...


  Would you please tell me how to understand and solve
such a oops ?
  And, though the kernel brings out such a oops, it
can continue to work(i.e. it doesn't crash). Then, can
I simply ignore such a oops, and go on with my work?
if it is, how/where to trun off such a oops (i.e.
ignore this oops, and don't let the kernel send out
such a oops, thought there surely are something
wrong)?  

  Thank you very much.

=====
Best Regards,
Park Lee


		
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Re: How to understand and turn off such a oops

[Michal Schmidt]

Park Lee wrote:
> Hi,
>   Sometimes, when I call kmalloc() in Linux kernel,
> the kernel always bring out a oops shown as following:
> 
> 
> Debug: sleeping function called from invalid context
> at mm/slab.c:1980
> in_atomic():1, irqs_disabled():0

You're calling kmalloc in a context where sleeping is not allowed. And 
kmalloc with the GFP_KERNEL flag can sleep. Use GFP_ATOMIC in that context.

Michal