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    SubjectBUG report
    I'm on a Slackware with kernel 2.6.17.3 obtained by applying patch-2.6.17.3
    to kernel 2.6.17.
    I plugged a Pinnacle pctv 50e USB tv card.
    It works correctly, I was trying it.
    After a while, I disconnected it and after very few seconds
    I plugged an external USB hard drive.
    For a couple of minutes, USB hub seemed to be not working.
    No messages on dmesg indicating a new device (usually /dev/sda,
    I have all the modules for that.)
    After about two minutes, the USB hub woke up (/dev/sda created, USB
    mouse working)
    and on syslog and on every terminal on my
    desktop appeared some messages.

    TERMINAL MESSAGES:

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: Oops: 0002 [#1]

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: PREEMPT

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: CPU: 0

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: EIP is at __fput+0xab/0x140

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: eax: 00000007 ebx: d613c000 ecx: d61cc030 edx: c01ebbf7

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: esi: d3ba2780 edi: d9548184 ebp: d94ede14 esp: d613df6c

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: ds: 007b es: 007b ss: 0068

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: Process firefox-bin (pid: 5500, threadinfo=d613c000
    task=d61cc030)

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: Stack: df7c4f40 d3ba2780 df68c5c0 00000000 d613c000
    c0147fda d3ba2780 df68c5c0

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: d3ba2780 df68c5c0 d613c000 df68c5c0 d3ba2780
    c014803c d3ba2780 df68c5c0

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: 00000030 00000002 09557fb0 c01025d7 00000030
    00000000 b68c7600 00000002

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: Call Trace:

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: <c0147fda> filp_close+0x4c/0x55 <c014803c> sys_close+0x59/0x7c

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: <c01025d7> syscall_call+0x7/0xb

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: Code: 38 58 5a 8b 87 f4 00 00 00 85 c0 74 07 50 e8 6a
    6e 00 00 58 8b 46 10 85 c0
    74 35 8b 00 85 c0 74 2f bb 00 e0 ff ff 21 e3 ff 43 14 <ff> 88 00 01
    00 00 83 38 02 75 0b 8b 80
    88 01 00 00 e8 08 67 fc

    Message from syslogd@slacky at Wed Jul 5 23:38:39 2006 ...
    slacky kernel: EIP: [<c01493c9>] __fput+0xab/0x140 SS:ESP 0068:d613df6c


    SYSLOG MESSAGES:

    Jul 5 23:38:39 slacky kernel: BUG: unable to handle kernel NULL
    pointer dereference at virtual
    address 00000107
    Jul 5 23:38:39 slacky kernel: printing eip:
    Jul 5 23:38:39 slacky kernel: c01493c9
    Jul 5 23:38:39 slacky kernel: *pde = 00000000
    Jul 5 23:38:39 slacky kernel: Oops: 0002 [#1]
    Jul 5 23:38:39 slacky kernel: PREEMPT
    Jul 5 23:38:39 slacky kernel: Modules linked in: vfat fat snd_pcm_oss
    snd_mixer_oss snd_usb_au
    dio snd_usb_lib snd_rawmidi snd_seq_device snd_hwdep tda9887 tuner
    saa7115 em28xx compat_ioctl3
    2 v4l1_compat v4l2_common ir_common videodev tveeprom i2c_core eth1394
    snd_intel8x0 snd_intel8x
    0m snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd snd_page_alloc
    yenta_socket rsrc_nonstatic
    pcmcia_core ohci1394 b44 joydev fuse evdev
    Jul 5 23:38:39 slacky kernel: CPU: 0
    Jul 5 23:38:39 slacky kernel: EIP: 0060:[<c01493c9>] Not tainted VLI
    Jul 5 23:38:39 slacky kernel: EFLAGS: 00010202 (2.6.17.3 #7)
    Jul 5 23:38:39 slacky kernel: EIP is at __fput+0xab/0x140
    Jul 5 23:38:39 slacky kernel: eax: 00000007 ebx: d613c000 ecx:
    d61cc030 edx: c01ebbf7
    Jul 5 23:38:39 slacky kernel: esi: d3ba2780 edi: d9548184 ebp:
    d94ede14 esp: d613df6c
    Jul 5 23:38:39 slacky kernel: ds: 007b es: 007b ss: 0068
    Jul 5 23:38:39 slacky kernel: Process firefox-bin (pid: 5500,
    threadinfo=d613c000 task=d61cc03
    0)
    Jul 5 23:38:39 slacky kernel: Stack: df7c4f40 d3ba2780 df68c5c0
    00000000 d613c000 c0147fda d3b
    a2780 df68c5c0
    Jul 5 23:38:39 slacky kernel: d3ba2780 df68c5c0 d613c000
    df68c5c0 d3ba2780 c014803c d3b
    a2780 df68c5c0
    Jul 5 23:38:39 slacky kernel: 00000030 00000002 09557fb0
    c01025d7 00000030 00000000 b68
    c7600 00000002
    Jul 5 23:38:39 slacky kernel: Call Trace:
    Jul 5 23:38:39 slacky kernel: <c0147fda> filp_close+0x4c/0x55
    <c014803c> sys_close+0x59/0x7c
    Jul 5 23:38:39 slacky kernel: <c01025d7> syscall_call+0x7/0xb
    Jul 5 23:38:39 slacky kernel: Code: 38 58 5a 8b 87 f4 00 00 00 85 c0
    74 07 50 e8 6a 6e 00 00 5
    8 8b 46 10 85 c0 74 35 8b 00 85 c0 74 2f bb 00 e0 ff ff 21 e3 ff 43 14
    <ff> 88 00 01 00 00 83 3
    8 02 75 0b 8b 80 88 01 00 00 e8 08 67 fc
    Jul 5 23:38:39 slacky kernel: EIP: [<c01493c9>] __fput+0xab/0x140
    SS:ESP 0068:d613df6c
    Jul 5 23:38:39 slacky kernel: <6>note: firefox-bin[5500] exited with
    preempt_count 1
    Jul 5 23:38:39 slacky kernel: hub 1-0:1.0: over-current change on port 2
    Jul 5 23:38:39 slacky kernel: hub 2-0:1.0: over-current change on port 1
    Jul 5 23:38:39 slacky kernel: hub 2-0:1.0: over-current change on port 2
    Jul 5 23:38:40 slacky kernel: hub 1-0:1.0: over-current change on port 1
    Jul 5 23:40:37 slacky kernel: hub 1-0:1.0: over-current change on port 1
    Jul 5 23:40:37 slacky kernel: hub 2-0:1.0: over-current change on port 1
    Jul 5 23:40:44 slacky kernel: sda: assuming drive cache: write through
    Jul 5 23:40:44 slacky kernel: sda: assuming drive cache: write through



    Hope it helps.
    Bye.
    -
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