Re: [Bugme-new] [Bug 8564] New: ftdi_sio: BUG: unable to handle kernel NULL pointer dereference at virtual address

It worked with 2.6.20 from fedora 6.

Is there any way to "patch" this for now, so I can get it working
again?  I need ftdi-sio for my usb-uirt as I am about to go out of
town for quite some time and can't use myth without it.  I mean, is
there some hack I can use?



On 6/1/07, Andrew Morton <[email protected]> wrote:
> On Fri, 1 Jun 2007 11:31:30 -0700
> [email protected] wrote:
> >
>
> (please followup via emailed reply-to-all, not via the bugzilla web
> interface)
>
> > http://bugzilla.kernel.org/show_bug.cgi?id=8564
> >
> >            Summary: ftdi_sio: BUG: unable to handle kernel NULL pointer
> >                     dereference at virtual address
> >     Kernel Version: 2.6.21-1.3194.fc7
> >             Status: NEW
> >           Severity: blocking
> >              Owner: [email protected]
> >          Submitter: [email protected]
> >
> >
> > Fedora 7
> > USB-UIRT
> >
> >    1.
> >       drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI
> > USB Serial Device
> >    2.
> >       ftdi_sio 3-2:1.0: FTDI USB Serial Device converter detected
> >    3.
> >       BUG: unable to handle kernel NULL pointer dereference at virtual address
> > 00000014
> >    4.
> >        printing eip:
> >    5.
> >       f8a1740a
> >    6.
> >       *pde = 00000000
> >    7.
> >       Oops: 0002 [#1]
> >    8.
> >       SMP
> >    9.
> >       last sysfs file: /devices/pci0000:00/0000:00:1d.7/usb5/idVendor
> >   10.
> >       Modules linked in: ftdi_sio bluetooth snd_seq snd_ac97_codec usblp
> > v4l1_compat fw_core snd_rawmidi sr_mod snd_pcm_oss snd_mixer_oss ac97_bus
> > snd_util_mem usbserial e100 serio_raw snd_seq_device snd_hwdep snd_pcm
> > emu10k1_gp cdrom mii snd_timer gameport snd soundcore iTCO_wdt snd_page_alloc
> > i2c_i801 iTCO_vendor_support pcspkr i2c_core floppy sg joydev usb_storage
> > ata_piix ata_generic libata sd_mod scsi_mod ext3 jbd mbcache ehci_hcd ohci_hcd
> > uhci_hcd
> >   11.
> >       CPU:    0
> >   12.
> >       EIP:    0060:[<f8a1740a>]    Not tainted VLI
> >   13.
> >       EFLAGS: 00010246   (2.6.21-1.3194.fc7 #1)
> >   14.
> >       EIP is at ftdi_USB_UIRT_setup+0x34/0x4e [ftdi_sio]
> >   15.
> >       eax: 00000000   ebx: f583f400   ecx: f8a17b34   edx: f8a173d6
> >   16.
> >       esi: f8a1dae0   edi: 00000040   ebp: f8a1dae0   esp: f582acdc
> >   17.
> >       ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
> >   18.
> >       Process modprobe (pid: 935, ti=f582a000 task=f5913150 task.ti=f582a000)
> >   19.
> >       Stack: f791e464 00000246 f598fb00 f5e823c0 f8a160b5 f898690a f898855b f8a18f6f
> >   20.
> >              f5ea06d0 f8a194fa f5ea0600 f5ea4800 f8a1dae0 00000000 00000000 00000001
> >   21.
> >              00000001 f583f400 00000000 c1806d60 00000001 00000001 00000001 00000000
> >   22.
> >       Call Trace:
> >   23.
> >        [<f8a160b5>] ftdi_sio_attach+0xf/0x12 [ftdi_sio]
> >   24.
> >        [<f898690a>] usb_serial_probe+0x97b/0xdd1 [usbserial]
> >   25.
> >        [<c042e748>] lock_timer_base+0x19/0x35
> >   26.
> >        [<c042e7a8>] try_to_del_timer_sync+0x44/0x4a
> >   27.
> >        [<c05692c8>] usb_resume_both+0xa1/0xb7
> >   28.
> >        [<c056947c>] usb_autopm_do_device+0xb3/0xbd
> >   29.
> >        [<c04ad4dd>] sysfs_create_link+0x128/0x13f
> >   30.
> >        [<c0568fd2>] usb_match_one_id+0x1c/0x71
> >   31.
> >        [<c0569d2d>] usb_probe_interface+0x81/0xb2
> >   32.
> >        [<c05529ab>] really_probe+0xc6/0x14f
> >   33.
> >        [<c0552a78>] driver_probe_device+0x44/0xa5
> >   34.
> >        [<c0552b72>] __driver_attach+0x0/0xa5
> >   35.
> >        [<c0552be2>] __driver_attach+0x70/0xa5
> >   36.
> >        [<c0551ffb>] bus_for_each_dev+0x37/0x59
> >   37.
> >        [<c055282a>] driver_attach+0x16/0x18
> >   38.
> >        [<c0552b72>] __driver_attach+0x0/0xa5
> >   39.
> >        [<c05522ad>] bus_add_driver+0x5e/0x15f
> >   40.
> >        [<c056985c>] usb_register_driver+0x6d/0xd4
> >   41.
> >        [<f89857b5>] usb_serial_register+0x1ed/0x1f6 [usbserial]
> >   42.
> >        [<f8806091>] ftdi_init+0x91/0xbe [ftdi_sio]
> >   43.
> >        [<c04432e4>] sys_init_module+0x16c3/0x17fa
> >   44.
> >        [<c04755f8>] do_sync_read+0xc7/0x10a
> >   45.
> >        [<c0468484>] do_mmap_pgoff+0x593/0x6f3
> >   46.
> >        [<c05507e5>] device_remove_file+0x0/0x25
> >   47.
> >        [<c0475531>] do_sync_read+0x0/0x10a
> >   48.
> >        [<c0475e85>] vfs_read+0xa6/0x152
> >   49.
> >        [<c0404f70>] syscall_call+0x7/0xb
> >   50.
> >        =======================
> >   51.
> >       Code: ee a1 f8 00 74 1c c7 44 24 08 a4 86 a1 f8 c7 44 24 04 b7 88 a1 f8 c7
> > 04 24 d5 88 a1 f8 e8 49 03 a1 c7 8b 43 14 8b 80 8c 01 00 00 <83> 48 14 30 c7 40
> > 08 4d 00 00 00 c7 80 80 00 00 00 0f 00 00 00
> >   52.
> >       EIP: [<f8a1740a>] ftdi_USB_UIRT_setup+0x34/0x4e [ftdi_sio] SS:ESP
> > 0068:f582acdc
> >
>
> It looks like the `serial' argument to ftdi_HE_TIRA1_setup() is NULL, and
> we went oops reading serial->port[0]).
>
> John, are you able to identify an earlier kernel version which did not
> have this bug?
>
> Thanks.
>

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