Trouble running oprofile with 2.6.8 & Gentoo

[Zarakin <za...@ho...>]

Hi,

I've been trying to get oprofile to run in my Gentoo box and I seem to be
getting an oops everytime I run "opcontrol --start".
Some specs:
- ST61G4 Shuttle box (ATI IXP chipset) running a P4 2.8Ghz with Nvidia
MX440, 512MB RAM.
- Kernel 2.6.8

I've tried various combinations of having oprofile driver as module, having
power management off (though shouldn't matter with 2.6.x kernels?)... The
oops is always the same.
---->8----->8-----
general protection fault: 0000 [#1]
Modules linked in: ipt_LOG ipt_state ip_conntrack iptable_filter ip_tables
uhci_
hcd at76c503_rfmd at76c503 usbdfu ati_agp ohci_hcd b44 mii snd_pcm_oss
snd_mixer
_oss snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_atiixp
snd_ac97_c
odec snd_pcm snd_timer snd snd_page_alloc tveeprom ivtv tuner saa7115
msp3400 i2
c_algo_bit i2c_core videodev nvidia nvidia_agp agpgart sbp2 ohci1394
ieee1394 us
b_storage ehci_hcd usbcore
CPU:    0
EIP:    0060:[<c0366ba8>]    Tainted: P
EFLAGS: 00010297   (2.6.8-gentoo)
EIP is at nmi_cpu_save_registers+0x4f/0x6c
eax: 00000000   ebx: 00000210   ecx: 000003ba   edx: 00000000
esi: d7c5b900   edi: 0000002c   ebp: d89b8000   esp: d30dfef4
ds: 007b   es: 007b   ss: 0068
Process oprofiled (pid: 9511, threadinfo=d30de000 task=d30916f0)
Stack: 0000003f 00000008 00000000 c0476fa0 dfd90d80 ffffffe9 c0366cea
c0519d08
       c0365411 ffffffea d305dc80 c036600c 00000001 d305dc80 d837c800
c0148336
       d837c800 d305dc80 00000000 00000000 d30ca000 d30de000 c014821f
d7c3476c
Call Trace:
 [<c0366cea>] nmi_setup+0x26/0x5c
 [<c0365411>] oprofile_setup+0x41/0xa3
 [<c036600c>] event_buffer_open+0x65/0x84
 [<c0148336>] dentry_open+0x115/0x1b4
 [<c014821f>] filp_open+0x62/0x64
 [<c013e872>] unmap_vma_list+0x1c/0x28
 [<c0148408>] get_unused_fd+0x33/0xb5
 [<c014852d>] sys_open+0x5b/0x8b
 [<c010571f>] syscall_call+0x7/0xb
Code: 0f 32 83 c7 01 89 44 1d 08 89 54 1d 04 83 c3 0c 3b 3c 24 72
---->8----->8-----

Any ideas what could be causing this? It seems NMI is causing some problems?