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SubjectBUG: unable to handle kernel NULL pointer dereference at 00000010
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Hi,

I have the following trace with 2.6.26.1, it seems to be related to a
wireless usb adapter that works with 2.6.25.x

My "feeling" is that such usb adapter works well with 2.6.25.x and
does not work with 2.6.26.x.

------------------------------------------------------------------------
phy1 -> rt2500usb_init_eeprom: Error - Invalid RT chipset detected.
phy1 -> rt2x00lib_probe_dev: Error - Failed to allocate device.
BUG: unable to handle kernel NULL pointer dereference at 00000010
IP: [<c012c550>] flush_workqueue+0xa/0x3f
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: rt2500usb(+) rt2x00usb rt2x00lib usbhid hid xt_tcpudp nf_conntrack_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables ppdev lp fuse sbp2 acpi_cpufreq freq_table arc4 ecb crypto_blkcipher pcmcia joydev snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm iwl3945 snd_timer iTCO_wdt intel_agp firmware_class snd yenta_socket rsrc_nonstatic sg i2c_i801 agpgart mac80211 container soundcore wmi serio_raw parport_pc pcspkr pcmcia_core irda ac evdev battery button parport psmouse i2c_core cfg80211 snd_page_alloc crc_ccitt sr_mod cdrom ext3 jbd mbcache dm_mirror dm_log dm_snapshot dm_mod sd_mod ata_piix ata_generic ohci1394 libata scsi_mod ieee1394 ehci_hcd uhci_hcd usbcore e1000 dock thermal processor fan
Pid: 4312, comm: modprobe Not tainted (2.6.26.1-1 #1)
EIP: 0060:[<c012c550>] EFLAGS: 00010246 CPU: 0
EIP is at flush_workqueue+0xa/0x3f
EAX: 00000000 EBX: f7ea1020 ECX: f7d4c000 EDX: 00000000
ESI: c035e7ec EDI: 00000000 EBP: f7e0a200 ESP: f7d4dea8
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process modprobe (pid: 4312, ti=f7d4c000 task=f7e86730 task.ti=f7d4c000)
Stack: f7ea1020 f7ea1020 f7ea01a0 f8cb81ee ffffffed f8cb8b65 f7ea1020 00000282
f8c93091 000080d0 f7ea1020 f8cc92e0 f7ea1020 00000000 f7ea01a0 f7e0a200
f8c9389c f79e2400 f7e0a200 f8ccaa2c 00000000 f8cca7e0 f8860880 f79e2400
Call Trace:
[<f8cb81ee>] rt2x00lib_remove_dev+0x1f/0x40 [rt2x00lib]
[<f8cb8b65>] rt2x00lib_probe_dev+0x2f5/0x311 [rt2x00lib]
[<f8c93091>] rt2x00usb_alloc_reg+0x46/0x7e [rt2x00usb]
[<f8c9389c>] rt2x00usb_probe+0xc6/0x101 [rt2x00usb]
[<f8860880>] usb_probe_interface+0xac/0xdd [usbcore]
[<c022b308>] __driver_attach+0x0/0x55
[<c022b291>] driver_probe_device+0xb5/0x12c
[<c022b33f>] __driver_attach+0x37/0x55
[<c022ab49>] bus_for_each_dev+0x34/0x56
[<c022b12c>] driver_attach+0x11/0x13
[<c022b308>] __driver_attach+0x0/0x55
[<c022ae9f>] bus_add_driver+0x8a/0x1a7
[<c01ccd56>] kset_find_obj+0x4f/0x56
[<c022b495>] driver_register+0x6d/0xc1
[<f88604e0>] usb_register_driver+0x5d/0xb4 [usbcore]
[<c013caa9>] sys_init_module+0x84/0x173
[<c010386d>] sysenter_past_esp+0x6a/0x91
[<c02a0000>] quirk_e100_interrupt+0x33/0x154
=======================
Code: 00 74 14 e8 90 ff ff ff 8b 43 20 e8 6e 24 00 00 c7 43 20 00 00 00 00 5b c3 83 c0 10 e9 0d ac fe ff 57 89 c7 56 be ec e7 35 c0 53 <83> 78 10 00 b8 f0 e7 35 c0 0f 44 f0 89 f0 e8 ca f8 09 00 eb 15
EIP: [<c012c550>] flush_workqueue+0xa/0x3f SS:ESP 0068:f7d4dea8
---[ end trace 009005218430c5d0 ]---
------------------------------------------------------------------------
Thanks.
--
Walter Franzini
http://aegis.stepbuild.org/

PGP Public key ID: 1024D/CB3FEB43
Key fingerprint : FA26 C33B CAFF 7848 EFEB 7327 96AA 2D57 CB3F EB43
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