Re: [drm:drm_mmap_locked] *ERROR* Could not find map: Could this be kernel-related?

[Bjorn Helgaas <bjorn.helgaas@hp.com>]

On Monday 04 January 2010 03:40:46 pm Émeric Maschino wrote:
> Indeed, it seems that something is going wrong with AGP GART. Here are
> the relevant lines of the dmesg output:
> 
> [   12.652322] Linux agpgart interface v0.103
> [   12.715735] Unable to handle kernel NULL pointer dereference
> (address 0000000000000003)
> [   12.715784] modprobe[895]: Oops 8804682956800 [1]
> [   12.715819] Modules linked in: hp_agp(+) agpgart snd_fm801
> snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm
> snd_page_alloc snd_tea575x_tuner videodev v4l1_compat
> v4l2_compat_ioctl32 i2c_core snd_opl3_lib snd_hwdep snd_mpu401_uart
> snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device snd fm801_gp soundcore gameport evdev ext4 mbcache jbd2
> crc16 sd_mod crc_t10dif usbhid hid ide_cd_mod cdrom ide_pci_generic
> ata_generic libata tg3 mptspi mptscsih e100 ohci_hcd cmd64x libphy
> mptbase scsi_transport_spi scsi_mod mii ide_core ehci_hcd usbcore
> nls_base [last unloaded: scsi_wait_scan]
> [   12.716925]
> [   12.716926] Pid: 895, CPU 0, comm:             modprobe
> [   12.716988] psr : 00001010085a6010 ifs : 8000000000000712 ip  :
> [<a000000202b10200>]    Not tainted (2.6.32-trunk-mckinley)
> [   12.717044] ip is at zx1_gart_probe+0xd0/0xcc0 [hp_agp]

This definitely looks like a kernel problem.  I tried to reproduce it,
but regrettably, the current upstream kernel croaks before I get that
far with this:

  Unable to handle kernel paging request at virtual address a00000010400ab00
  swapper[0]: Oops 8804682956800 [1]
  Modules linked in:

  Pid: 0, CPU 0, comm:              swapper
  psr : 00001010084a6018 ifs : 8000000000000288 ip  : [<a000000100ed8d60>]    Not tainted (2.6.33-rc2-00302-gc5974b8)
  ip is at proc_net_ns_init+0x100/0x160

Guess I'll have to sort through that problem first.

Bjorn