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    Subject[2.6.27-rc7] oops in usbcore
    Hi,

    I got the following oops:

    [ 135.687646] BUG: unable to handle kernel paging request at f88643c8
    [ 135.687654] IP: [<f883c70a>] :usbcore:unlink1+0xab/0xb9
    [ 135.687703] *pde = 34824067 *pte = 00000000
    [ 135.687710] Oops: 0000 [#1]
    [ 135.687715] Modules linked in: sata_via via_rng cpufreq_userspace snd_usb_audio snd_via82xx snd_mpu401_uart ff_memless i2c_viapro snd_hwdep snd_hda_intel dm_snapshot psmouse parport_pc cpufreq_powersave ide_pci_generic fan ppdev parport tun cpufreq_ondemand ipv6 nls_utf8 cifs nls_base nfsd auth_rpcgss exportfs nfs lockd nfs_acl sunrpc freq_table crypto_blkcipher aes_generic rng_core snd_pcm_oss snd_mixer_oss rfcomm l2cap bluetooth gameport snd_ac97_codec ac97_bus hwmon_vid firewire_sbp2 firewire_core crc_itu_t cdrom serio_raw snd_pcm snd_usb_lib snd_timer snd_page_alloc snd_rawmidi snd_seq_device videodev ftdi_sio v4l1_compat snd soundcore i2c_core hid usbserial pci_hotplug via_agp agpgart evdev ext3 jbd mbcache dm_mirror dm_log dm_mod ide_disk libata scsi_mod dock via_rhine mii via82cxxx usbcore ide_core via_velocity crc_ccitt processor thermal_sys [last unloaded: ehci_hcd]
    [ 135.687798]
    [ 135.687803] Pid: 3589, comm: lpc-ntpd Not tainted (2.6.27-rc7-c7-c7temp-100hz-ch341 #1)
    [ 135.687809] EIP: 0060:[<f883c70a>] EFLAGS: 00010286 CPU: 0
    [ 135.687841] EIP is at unlink1+0xab/0xb9 [usbcore]
    [ 135.687846] EAX: f4b62000 EBX: f8864394 ECX: fffffffe EDX: f74a4d40
    [ 135.687851] ESI: f4b62000 EDI: f74a4d40 EBP: f609ade8 ESP: f609add4
    [ 135.687856] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
    [ 135.687861] Process lpc-ntpd (pid: 3589, ti=f609a000 task=f6fb8ae0 task.ti=f609a000)
    [ 135.687865] Stack: fffffffe f609adec f74a4d40 f422f680 00000000 f609adf4 f883c7f6 f74a4d40
    [ 135.687875] f609ae1c f883d8db f4802758 f4802740 f609ae14 c012b8b1 f42d0800 f42d0800
    [ 135.687885] f422f680 00000000 f609ae34 f8976e03 22222222 f897fc08 f42d0800 f42d08c4
    [ 135.687894] Call Trace:
    [ 135.687901] [<f883c7f6>] ? usb_hcd_unlink_urb+0x15/0x22 [usbcore]
    [ 135.687937] [<f883d8db>] ? usb_kill_urb+0x4d/0xc8 [usbcore]
    [ 135.687970] [<c012b8b1>] ? flush_workqueue+0x3b/0x42
    [ 135.687987] [<f8976e03>] ? ftdi_close+0xce/0xd6 [ftdi_sio]
    [ 135.688022] [<f893782b>] ? serial_close+0x82/0x103 [usbserial]
    [ 135.688042] [<c0230e38>] ? release_dev+0x18c/0x405
    [ 135.688056] [<c0138f4c>] ? trace_hardirqs_on+0xb/0xd
    [ 135.688068] [<c023117e>] ? tty_release+0xa/0xe
    [ 135.688075] [<c0178279>] ? __fput+0x99/0x169
    [ 135.688086] [<c017835f>] ? fput+0x16/0x18
    [ 135.688092] [<c0175abd>] ? filp_close+0x50/0x5a
    [ 135.688099] [<c011f6a7>] ? put_files_struct+0x67/0xa9
    [ 135.688108] [<c011f720>] ? exit_files+0x37/0x3c
    [ 135.688115] [<c0120c68>] ? do_exit+0x1c9/0x6e8
    [ 135.688121] [<c011ad5d>] ? finish_task_switch+0x0/0xa1
    [ 135.688129] [<c02c3715>] ? schedule+0x38c/0x3c0
    [ 135.688139] [<c025c945>] ? sys_socketcall+0xe2/0x1a1
    [ 135.688150] [<c01211e4>] ? do_group_exit+0x5d/0x83
    [ 135.688156] [<c012121d>] ? sys_exit_group+0x13/0x15
    [ 135.688163] [<c0103857>] ? sysenter_do_call+0x12/0x3f
    [ 135.688171] =======================
    [ 135.688173] Code: 89 fa e8 e7 fe ff ff b8 00 4f 85 f8 e8 b8 8e a8 c7 8b 55 f0 b8 00 4f 85 f8 e8 9f 8d a8 c7 eb 10 8b 9e bc 00 00 00 89 f0 8b 4d ec <ff> 53 34 89 c3 5e 89 d8 5f 5b 5e 5f 5d c3 55 89 e5 57 56 89 d6
    [ 135.688216] EIP: [<f883c70a>] unlink1+0xab/0xb9 [usbcore] SS:ESP 0068:f609add4
    [ 135.688256] ---[ end trace 72b733a963031dcf ]---
    [ 135.688260] Fixing recursive fault but reboot is needed!

    System:
    VIA SN18000G epia C7 with 4GB of ram

    lpc-ntpd is a atomic clock receiver driver doing read()-calls on an fd
    from a serial device (connected via usb), nothing fancy
    (http://vanheusden.com/lpc-ntpd/ ).

    This oops is very much reproducable using the following script:

    pyk-perl.mod:
    =----------=--------------------------------------------------
    #! /usr/bin/perl -w

    use POSIX;

    @mods = <>;

    for(;;)
    {
    $n = floor(rand(@mods));

    print $mods[$n]."\n";
    if (rand(2) < 1.0)
    {
    system('rmmod ' . $mods[$n]);
    }
    else
    {
    system('modprobe ' . $mods[$n]);
    }
    }
    --------------------------------------------------------------

    invoked with:
    lsmod | grep -v -e via_rhine -v -e mii | awk '{ print $1; }' | ./pyk-perl.mod


    Folkert van Heusden

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