Re: Linux 2.6.10-rc3 oops when 'modprobe -r dvb-bt8xx'

[Eyal Lebedinsky <eyal@eyal.emu.id.au>]

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Linus Torvalds wrote:
> Please do test this - and don't send me anything but bug-fixes. Let's aim
> for a real 2.6.10 before xmas (or hanukkah, or whatever your favourite
> holiday happens to be).

In the spirit of festive testing I would like to say that the oops that I
enjoyed throughout rc2-bk* is still present in -rc3. -mm series does not
have this problem.

I boot -rc3 single user then do
	modprobe -r dvb-bt8xx
The system oopses, but I can do a clean reboot (original -rc2
could not umount cleanly).

bt878(0): unloading
bt878(1): unloading
bttv0: unloading
bttv1: unloading
devfs_remove: dvb/adapter0/frontend0 not found, cannot remove
  [<c01a13a9>] devfs_remove+0xae/0xb0
  [<c015991e>] invalidate_inode_buffers+0x1b/0x80
  [<c01ab5cb>] inode_free_security+0x59/0x8b
  [<f91b955e>] dvb_unregister_device+0x39/0x89 [dvb_core]
  [<f91c1df4>] dvb_unregister_frontend+0x7b/0xcc [dvb_core]
  [<c01bec25>] kobject_release+0x0/0xa
  [<f90e2634>] mt352_detach_client+0x52/0x54 [mt352]
  [<f90e2040>] mt352_ioctl+0x0/0x2a0 [mt352]
  [<f8a20361>] i2c_del_adapter+0xeb/0x244 [i2c_core]
  [<c01bec4d>] kobject_put+0x1e/0x22
  [<f904d23a>] bttv_remove+0xa4/0x160 [bttv]
  [<c01c6cad>] pci_device_remove+0x3b/0x3d
  [<c021718a>] device_release_driver+0x7f/0x81
  [<f904d684>] bttv_cleanup_module+0x0/0x1f [bttv]
  [<c02171ac>] driver_detach+0x20/0x2e
  [<c02175d6>] bus_remove_driver+0x4d/0x8e
  [<c0217b0c>] driver_unregister+0x13/0x27
  [<c01c6eda>] pci_unregister_driver+0x16/0x26
  [<f904d693>] bttv_cleanup_module+0xf/0x1f [bttv]
  [<c013336e>] sys_delete_module+0x14e/0x181
  [<c014bc57>] sys_munmap+0x51/0x76
  [<c010308b>] syscall_call+0x7/0xb
Unable to handle kernel NULL pointer dereference at virtual address 00000228
  printing eip:
f9053830
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP
Modules linked in: tsdev psmouse mt352 sp887x v4l1_compat dvb_core i810_audio ac97_codec sr_mod sg ide_scsi ide_cd cdrom it87 eth1394 eeprom i2c_isa i2c_i801 i2c_sensor ohci_hcd ohci1394 ieee1394 dc395x scsi_mod snd_bt87x bttv tuner video_buf firmware_class i2c_algo_bit v4l2_common btcx_risc videodev e1000 snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd snd_page_alloc soundcore i2c_core cfi_cmdset_0002 cfi_util mtdpart jedec_probe cfi_probe gen_probe ichxrom mtdcore chipreg map_funcs ehci_hcd uhci_hcd usbcore shpchp pci_hotplug intel_mch_agp intel_agp agpgart parport_pc parport evdev nls_cp437 msdos fat dm_mod rtc unix
CPU:    0
EIP:    0060:[<f9053830>]    Not tainted VLI
EFLAGS: 00010206   (2.6.10-rc3)
EIP is at bttv_i2c_info+0x36/0x6a [bttv]
eax: 000001a0   ebx: f7a14e3c   ecx: f7a14d80   edx: 00000004
esi: f9066670   edi: 00000000   ebp: f7765400   esp: f78ade50
ds: 007b   es: 007b   ss: 0068
Process modprobe (pid: 5256, threadinfo=f78ad000 task=f78ee520)
Stack: f77a3800 c01bec4d f7771640 f7765400 f755f080 f90664a4 00000000 f905319d
        f90664a0 f7765400 00000000 f8a208c7 f7765400 f91c1e28 f77a3800 c01bec25
        f7765400 f755f080 f906660c f90664a4 f90e2606 f7765400 f778d8c0 f7765400
Call Trace:
  [<c01bec4d>] kobject_put+0x1e/0x22
  [<f905319d>] detach_inform+0x24/0x2a [bttv]
  [<f8a208c7>] i2c_detach_client+0x2e/0x104 [i2c_core]
  [<f91c1e28>] dvb_unregister_frontend+0xaf/0xcc [dvb_core]
  [<c01bec25>] kobject_release+0x0/0xa
  [<f90e2606>] mt352_detach_client+0x24/0x54 [mt352]
  [<f8a20361>] i2c_del_adapter+0xeb/0x244 [i2c_core]
  [<c01bec4d>] kobject_put+0x1e/0x22
  [<f904d23a>] bttv_remove+0xa4/0x160 [bttv]
  [<c01c6cad>] pci_device_remove+0x3b/0x3d
  [<c021718a>] device_release_driver+0x7f/0x81
  [<f904d684>] bttv_cleanup_module+0x0/0x1f [bttv]
  [<c02171ac>] driver_detach+0x20/0x2e
  [<c02175d6>] bus_remove_driver+0x4d/0x8e
  [<c0217b0c>] driver_unregister+0x13/0x27
  [<c01c6eda>] pci_unregister_driver+0x16/0x26
  [<f904d693>] bttv_cleanup_module+0xf/0x1f [bttv]
  [<c013336e>] sys_delete_module+0x14e/0x181
  [<c014bc57>] sys_munmap+0x51/0x76
  [<c010308b>] syscall_call+0x7/0xb
Code: 8b 6c 24 24 8b 7c 24 28 8b 98 d0 01 00 00 8b 13 0f 18 02 90 8d b0 d0 01 00 00 39 f3 74 24 8d 8b 44 ff ff ff 8b 41 70 85 c0 74 09 <83> b8 88 00 00 00 00 75 16 8b 02 89 d3 89 c2 0f 18 00 90 39 f3

-- 
Eyal Lebedinsky (eyal@eyal.emu.id.au) <http://samba.org/eyal/>
	If attaching .zip rename to .dat

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