Re: Kernel BUG at mm/prio_tree.c:538

[Hugh Dickins]

On Mon, 20 Sep 2004, Stefan Hornburg wrote:
> 
> on one of my machines the kernel is oopsing every so often with
> the following message:
> 
> Sep 19 18:59:19 www2 kernel: ------------[ cut here ]------------
> Sep 19 18:59:19 www2 kernel: kernel BUG at mm/prio_tree.c:538!

That is worrying, we've not seen any such problem before.  You mention it
happens with several kernels, so it doesn't feel like random corruption.

Would you mind mailing me and Rajesh (not the list) the output
of "objdump -rd mm/prio_tree.o" from your kernel build tree,
to help us make sense of what's shown in the registers here?

Though I very much doubt that will shed enough light: we'll probably
need to add printks to dump out the vmas involved when this happens.
Would running such a debug kernel build on this machine be possible?

Thanks,
Hugh

> Sep 19 18:59:19 www2 kernel: invalid operand: 0000 [#1]
> Sep 19 18:59:19 www2 kernel: SMP 
> Sep 19 18:59:19 www2 kernel: Modules linked in: dm_mod
> Sep 19 18:59:19 www2 kernel: CPU:    0
> Sep 19 18:59:19 www2 kernel: EIP:    0060:[vma_prio_tree_add+21/160]    Not tainted
> Sep 19 18:59:19 www2 kernel: EFLAGS: 00010206   (2.6.8.1) 
> Sep 19 18:59:19 www2 kernel: EIP is at vma_prio_tree_add+0x15/0xa0
> Sep 19 18:59:19 www2 kernel: eax: d8e2b5b8   ebx: d5298f90   ecx: 00000000   edx: 0000000a
> Sep 19 18:59:19 www2 kernel: esi: d8e2b5b8   edi: 00000000   ebp: 0fa9b000   esp: d8e91ef0
> Sep 19 18:59:19 www2 kernel: ds: 007b   es: 007b   ss: 0068
> Sep 19 18:59:19 www2 kernel: Process cfserver (pid: 1317, threadinfo=d8e91000 task=d7fb4650)
> Sep 19 18:59:20 www2 kernel: Stack: d5298fb8 d5298f90 00000000 c0135b19 d5298f90 d8e2b5b8 d6004bf4 d6fa68ac 
> Sep 19 18:59:20 www2 kernel:        c013ed0f d5298f90 ded2be58 d6fa68ac d6fa6900 d5298f90 0fa9b000 bd7fed90 
> Sep 19 18:59:20 www2 kernel:        00000000 00000000 def6a780 ded2be58 ded2be38 00000000 df84e300 c013fdf4 
> Sep 19 18:59:20 www2 kernel: Call Trace:
> Sep 19 18:59:20 www2 kernel:  [vma_prio_tree_insert+37/44] vma_prio_tree_insert+0x25/0x2c
> Sep 19 18:59:20 www2 kernel:  [vma_adjust+363/808] vma_adjust+0x16b/0x328
> Sep 19 18:59:20 www2 kernel:  [split_vma+252/264] split_vma+0xfc/0x108
> Sep 19 18:59:20 www2 kernel:  [do_munmap+126/280] do_munmap+0x7e/0x118
> Sep 19 18:59:20 www2 kernel:  [sys_munmap+56/88] sys_munmap+0x38/0x58
> Sep 19 18:59:20 www2 kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
> Sep 19 18:59:20 www2 kernel: Code: 0f 0b 1a 02 9f 51 35 c0 8b 43 04 8b 7b 08 29 c7 89 f8 c1 e8 
> 
> This happens with 2.6.8.1 as well as with earlier kernels. 
> This is a Quad-Xeon-Box from Dell (SMP kernel).
> I've no idea what is causing these failures and didn't found anything useful
> by searching. Therefore I would be grateful for any help.

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