[2.6.11.6] Oops trying to remove module "bttv"

From: Jose Luis Domingo Lopez (linux-kernel_at_24x7linux.com)
Date: 04/03/05

  • Next message: Jesper Juhl: "Re: [2.6.11.6] Oops trying to remove module "bttv"" 
    Date:	Sun, 3 Apr 2005 01:17:37 +0200
To: Linux-Kernel <linux-kernel@vger.kernel.org>

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    Hi all:

    I am getting the following stack dump in the logs when I try to unload the
    "bttv" kernel module ("rmmod bttv" ends with SIGSEGV). I have tried with
    other kernel versions keeping "module-init-tools" version the same (Debian
    3.1-rel-2), and realized that:
    - - 2.6.10-rc3-bk15: OK
    - - 2.6.11-rc-bk3: OK
    - - 2.6.11-rc3: FAILS
    - - 2.6.11.6: FAILS

    So it seems the bug was introduced somewhere 2.6.11-rc-bk3 and 2.6.11-rc3.
    Looking at the 2.6.11-rc2 to 2.6.11-rc3 Changelog there seems to be
    several changesets related to video4linux, but apparently just one related
    to the bttv.ko kernel module (changeset number 1.1966.2.154). I am,
    however, not qualified to tell if the problem is there:

    bttv0: unloading
    Unable to handle kernel NULL pointer dereference at virtual address 00000224
     printing eip:
    e0c3d95d
    *pde = 00000000
    Oops: 0000 [#1]
    Modules linked in: md5 ipv6 snd_via82xx uhci_hcd usbcore i2c_viapro tuner tvaudio bttv video_buf v4l2_common btcx_risc tveeprom videodev snd_ymfpci snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_opl3_lib snd_timer snd_hwdep snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore skystar2 dvb_core mt352 stv0299 nxt2002 firmware_class mt312 8139too 8139cp mii via_agp agpgart reiserfs xfs exportfs dm_mod it87 i2c_sensor i2c_isa rtc
    CPU: 0
    EIP: 0060:[<e0c3d95d>] Not tainted VLI
    EFLAGS: 00010206 (2.6.11.6)
    EIP is at bttv_i2c_info+0x3d/0x80 [bttv]
    eax: 000001a0 ebx: df8df77c ecx: df8df6c0 edx: 00000004
    esi: e0c4dba0 edi: 00000000 ebp: deaf7800 esp: de42be38
    ds: 007b es: 007b ss: 0068
    Process rmmod (pid: 2448, threadinfo=de42a000 task=df908a40)
    Stack: e0c4da64 c01b3c70 c01b4719 deaf7800 df683920 e0c4d9e4 00000000 e0c3d2f4
           e0c4d9e0 deaf7800 00000000 c024e89e deaf7800 deaf743c c0351350 c034e0e8
           c034e100 df8df6e4 c034e0e8 00000286 deaf7800 df683920 e0c4db44 e0c4d9e4
    Call Trace:
     [<c01b3c70>] kobject_release+0x0/0x10
     [<c01b4719>] kref_put+0x39/0xa0
     [<e0c3d2f4>] detach_inform+0x24/0x30 [bttv]
     [<c024e89e>] i2c_detach_client+0x2e/0x100
     [<e0c16bad>] tuner_detach+0x1d/0x40 [tuner]
     [<c024e327>] i2c_del_adapter+0xd7/0x220
     [<c01b3c9e>] kobject_put+0x1e/0x30
     [<c01b3c9e>] kobject_put+0x1e/0x30
     [<c01b3c70>] kobject_release+0x0/0x10
     [<e0c37084>] bttv_remove+0xa4/0x160 [bttv]
     [<c01bcd3b>] pci_device_remove+0x3b/0x40
     [<c022212f>] device_release_driver+0x7f/0x90
     [<c0222160>] driver_detach+0x20/0x30
     [<c02225cc>] bus_remove_driver+0x4c/0x90
     [<c0222b83>] driver_unregister+0x13/0x30
     [<c01bcf86>] pci_unregister_driver+0x16/0x30
     [<e0c374df>] bttv_cleanup_module+0xf/0x1f [bttv]
     [<c0129137>] sys_delete_module+0x167/0x1a0
     [<c013f5a8>] do_munmap+0x118/0x150
     [<c013f624>] sys_munmap+0x44/0x70
     [<c0102543>] syscall_call+0x7/0xb
    Code: 28 8b 98 c0 01 00 00 8b 13 0f 18 02 90 8d b0 c0 01 00 00 39 f3 74 2b 8d b4 26 00 00 00 00 8d 8b 44 ff ff ff 8b 41 70 85 c0 74 09 <83> b8 84 00 00 00 00 75 1a 8b 02 89 d3 89 c2 0f 18 00 90 39 f3

    Hope it helps, greetings,

    - --
    Jose Luis Domingo Lopez
    Linux Registered User #189436 Debian Linux Sid (Linux 2.6.11.6)

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  • Next message: Jesper Juhl: "Re: [2.6.11.6] Oops trying to remove module "bttv""

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