Re: Debugging memory allocation

[Adrian M. <ad...@ne...>]

On Thu, 2007-10-04 at 19:32 +0900, Paul Mundt wrote:
> On Wed, Sep 12, 2007 at 08:50:33PM +0100, Adrian McMenamin wrote:
> > I don't know if this is just G2 flakiness, but if I start playing sound
> > and then start hotplugging devices then I will sometimes get this sort
> > of oops (these don't down the system but they can make it unstable) -
> > any clues as to what might be the issue (these are now quite old -rc2?
> > kernels...)... just wondering if anybody can see anything obvious?
> > 
> > [   95.916012] Maple bus detaching at (0, 2)
> > [   96.208858] Unable to handle kernel paging request at virtual address
> > dfff0800
> > [   96.215707] pc = 8c00e480
> > [   96.218317] *pde = 00000000
> > [   96.221194] Oops: 0001 [#1]
> > [   96.224005] Modules linked in: snd_aica snd_pcm_oss snd_pcm snd_timer
> > snd_page_alloc snd_mixer_oss snd soundcore maple_keyb
> > [   96.235500] 
> > [   96.237035] Pid : 1842, Comm:                    [
> > [   96.241993] PC is at __copy_user_page+0x28/0x54
> 
> You've faulted on a fixmap slot, perhaps you've hit a race with the page
> colouring code. Can you try with write-through caching enabled?

Doesn't want to work....

    1.689829] BUG: FPU is used in kernel mode.
[    1.694764] unaligned program counter: 00e0 [#1]
[    1.700040] Modules linked in:
[    1.703529] 
[    1.705268] PC  : 7bffffff SP  : 8c2edbe8 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#2]
[    1.716833] Modules linked in:
[    1.720323] 
[    1.722061] PC  : 7bffffff SP  : 8c2ed954 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#3]
[    1.733627] Modules linked in:
[    1.737116] 
[    1.738853] PC  : 7bffffff SP  : 8c2ed6c0 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#4]
[    1.750418] Modules linked in:
[    1.753908] 
[    1.755647] PC  : 7bffffff SP  : 8c2ed42c SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#5]
[    1.767214] Modules linked in:
[    1.770703] 
[    1.772441] PC  : 7bffffff SP  : 8c2ed198 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#6]
[    1.784008] Modules linked in:
[    1.787497] 
[    1.789234] PC  : 7bffffff SP  : 8c2ecf04 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#7]
[    1.800798] Modules linked in:
[    1.804287] 
[    1.806024] PC  : 7bffffff SP  : 8c2ecc70 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#8]
[    1.817590] Modules linked in:
[    1.821080] 
[    1.822817] PC  : 7bffffff SP  : 8c2ec9dc SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#9]
[    1.834383] Modules linked in:
[    1.837872] 
[    1.839608] PC  : 7bffffff SP  : 8c2ec748 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#10]
[    1.851272] Modules linked in:
[    1.854762] 
[    1.856498] PC  : 7bffffff SP  : 8c2ec4b4 SR  : 400080f0 TEA :
7bffffff    unaligned program counter: 00e0 [#11]
[    1.868164] Modules linked in:
[    1.871653] 
[    1.873393] PC  : 7bffffff SP  : 8c2ec220 SR  : 400080f0 TEA :
7bffffff    insn faulting in do_address_error: 0000 [#12]
[    1.885857] Modules linked in:
[    1.889351] 
[    1.891075] insn faulting in do_address_error: 0000 [#13]
[    1.897249] Modules linked in:
[    1.900744] 
[    1.902469] insn faulting in do_address_error: 0000 [#14]
[    1.908642] Modules linked in:
[    1.912136] 
[    1.913860] insn faulting in do_address_error: 0000 [#15]
[    1.920034] Modules linked in:
[    1.923529] 
[    1.925254] insn faulting in do_address_error: 0000 [#16]
[    1.931426] Modules linked in:
[    1.934920] 
[    1.936644] insn faulting in do_address_error: 0000 [#17]
[    1.942816] Modules linked in:
[    1.946310] 
[    1.948033] insn faulting in do_address_error: 0000 [#18]
[    1.954205] Modules linked in:
[    1.957699] 
[    1.959423] insn faulting in do_address_error: 0000 [#19]
[    1.965595] Modules linked in:

and so on...