oops in scsi_device_put after PCMCIA based USB HC is ejected

oops in scsi_device_put after PCMCIA based USB HC is ejected

[deepti.chotai]

Hi,

I am working on a HCD for an OHCI compliant USB Host Controller on a
PCMICIA card for 2.6.15.4 kernel. On inserting a USB key it is
auto-mounted in X-Windows. While carrying out transfer on USB key, on
90% transfer completion, when I manually eject the PCMCIA card, an oops
occurs. This happens occasionally and it occurs only on a dual core
laptop.

Following is the /var/log/messages extract:

Jul  5 17:57:38 localhost kernel: pccard: card ejected from slot 0
Jul  5 17:57:38 localhost kernel: usb usb1: USB disconnect, address 1
Jul  5 17:57:38 localhost kernel: usb 1-1: USB disconnect, address 2
Jul  5 17:57:38 localhost kernel: My-hcd: USB bus 1 deregistered
Jul  5 17:57:39 localhost fstab-sync[7999]: removed mount point
/media/usbdisk for /dev/sdc
Jul  5 17:57:39 localhost kernel:  6:0:0:0: rejecting I/O to dead device
Jul  5 17:57:39 localhost kernel: FAT: bread failed in
fat_clusters_flush
Jul  5 17:57:39 localhost kernel: Unable to handle kernel paging request
at virtual address 1000a5b8
Jul  5 17:57:39 localhost kernel:  printing eip:
Jul  5 17:57:39 localhost kernel: c01564b9
Jul  5 17:57:39 localhost kernel: *pde = 0eaf1001
Jul  5 17:57:39 localhost kernel: Oops: 0000 [#1]
Jul  5 17:57:39 localhost kernel: PREEMPT SMP 
Jul  5 17:57:39 localhost kernel: Modules linked in: serial_cs 8250
serial_core my_cs my_hcd vfat fat usb_storage parport_pc lp parport
autofs4 rfcomm l2cap bluetooth sunrpc dm_mod video button battery
asus_acpi ac ipv6 ohci1394 ieee1394 yenta_socket rsrc_nonstatic shpchp
i2c_i801 i2c_core snd_hda_intel snd_hda_codec snd_seq_dummy snd_seq_oss
snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
snd_pcm snd_timer snd soundcore snd_page_alloc r8169 joydev ext3 jbd
ata_piix libata sd_mod scsi_mod
Jul  5 17:57:39 localhost kernel: CPU:    1
Jul  5 17:57:39 localhost kernel: EIP:    0060:[<c01564b9>]    Not
tainted VLI
Jul  5 17:57:39 localhost kernel: EFLAGS: 00010082   (2.6.15.4SMP) 
Jul  5 17:57:39 localhost kernel: EIP is at kfree+0x39/0x70
Jul  5 17:57:39 localhost kernel: eax: 00000001   ebx: cebe28c0   ecx:
d4bd4934   edx: c1000000
Jul  5 17:57:39 localhost fstab-sync[8048]: removed mount point
/media/USBDISKPRO for /dev/sdb1
Jul  5 17:57:39 localhost kernel: esi: 445f4253   edi: 1000a5b4   ebp:
00000206   esp: ce5bae20
Jul  5 17:57:39 localhost kernel: ds: 007b   es: 007b   ss: 0068
Jul  5 17:57:39 localhost kernel: Process umount (pid: 8039,
threadinfo=ce5ba000 task=df3a7000)
Jul  5 17:57:39 localhost kernel: Stack: cebe28c0 c03dbad8 c03dbb00
df9ed4f8 c01fc735 cebe28d8 c01fc790 cfd15180 
Jul  5 17:57:39 localhost kernel:        cf37484c c01fd11b c03dbad8
c01fc755 d4bd494c c01fc790 d4bd494c c01fc790 
Jul  5 17:57:39 localhost kernel:        c01fd11b c03dbad8 c01fc755
d5fe6d4c c01fc790 d5fe6d4c c01fc790 c01fd11b 
Jul  5 17:57:39 localhost kernel: Call Trace:
Jul  5 17:57:39 localhost kernel:  [<c01fc735>]
kobject_cleanup+0x35/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<c01fc755>]
kobject_cleanup+0x55/0x90
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fc790>] kobject_release+0x0/0x10
Jul  5 17:57:39 localhost kernel:  [<c01fd11b>] kref_put+0x2b/0x80
Jul  5 17:57:39 localhost kernel:  [<e085512c>]
scsi_device_put+0x3c/0x80 [scsi_mod]
Jul  5 17:57:39 localhost kernel:  [<e082f141>] scsi_disk_put+0x41/0x60
[sd_mod]
Jul  5 17:57:39 localhost kernel:  [<e082f872>] sd_release+0x62/0x80
[sd_mod]
Jul  5 17:57:39 localhost kernel:  [<c017834b>] blkdev_put+0x16b/0x1b0
Jul  5 17:57:39 localhost kernel:  [<c0178320>] blkdev_put+0x140/0x1b0
Jul  5 17:57:39 localhost kernel:  [<c0175f2a>]
deactivate_super+0x9a/0xc0
Jul  5 17:57:39 localhost kernel:  [<c018def9>] sys_umount+0x39/0x80
Jul  5 17:57:39 localhost kernel:  [<c0104451>] syscall_call+0x7/0xb
Jul  5 17:57:39 localhost kernel: Code: 89 7c 24 08 89 6c 24 0c 74 34 9c
5d fa 8b 15 90 7a 4e c0 8d 80 00 00 00 40 c1 e8 0c 8d 04 40 c1 e0 04 8b
7c 10 28 e8 47 bc 0a 00 <8b> 1c 87 8b 03 3b 43 04 73 1c 89 74 83 24 40
89 03 55 9d 8b 1c

I need help in understanding why is the crash happening in
scsi_device_put. Is it due to the order in which the USB bus resources
are released (hcd is removed) and USB key is unmounted? If yes, how can
I prevent this from happening?

I am not subscribed to this list. Please do cc your comments to me.

Thanks for your time and help.

-Deepti 

Re: oops in scsi_device_put after PCMCIA based USB HC is ejected

[Andrew Morton]

On Sun, 23 Jul 2006 15:17:02 +0530
<deepti.chotai@wipro.com> wrote:

> I am working on a HCD for an OHCI compliant USB Host Controller on a
> PCMICIA card for 2.6.15.4 kernel.

We've changed an awful lot of things in that area since 2.6.15.  It'd be
best if you could retest 2.6.18-rc2, please.

RE: oops in scsi_device_put after PCMCIA based USB HC is ejected

[deepti.chotai]

> -----Original Message-----
> From: Andrew Morton [mailto:akpm@osdl.org]
> Sent: Sunday, July 23, 2006 6:00 PM
> To: Deepti Chotai (WT01 - Semiconductors & Consumer Electronics)
> Cc: linux-kernel@vger.kernel.org
> Subject: Re: oops in scsi_device_put after PCMCIA based USB HC is
ejected
> 
> On Sun, 23 Jul 2006 15:17:02 +0530
> <deepti.chotai@wipro.com> wrote:
> 
> > I am working on a HCD for an OHCI compliant USB Host Controller on a
> > PCMICIA card for 2.6.15.4 kernel.
> 
> We've changed an awful lot of things in that area since 2.6.15.  It'd
be
> best if you could retest 2.6.18-rc2, please.

We are in the last stage of development currently. Porting the drivers
to 2.6.18-rc2 will be not be feasible for us, in the available time
frame. Could you please suggest any patches for the kernel 2.6.15.4 or
indicate the changes that have been made.

Thanks for your help.

-Deepti