On Wed, 13 Sep 2006, Rafael J. Wysocki wrote:
> 'rmmod ohci_hcd' causes the following oops to appear on my HPC 6325 every
> time (happens also on -rc6-mm1, does not happen on -rc7):
>
> Unable to handle kernel NULL pointer dereference at 0000000000000274 RIP:
> [<ffffffff8822c185>] :ohci_hcd:ohci_hub_status_data+0x25/0x27b
> PGD 35ca9067 PUD 369a4067 PMD 0
> Call Trace:
> [<ffffffff8818e03f>] :usbcore:usb_hcd_poll_rh_status+0x40/0x13b
> [<ffffffff8822c01b>] :ohci_hcd:ohci_irq+0xcb/0x210
> [<ffffffff8818e78b>] :usbcore:usb_hcd_irq+0x2f/0x5f
> [<ffffffff8020ef13>] handle_IRQ_event+0x33/0x66
> [<ffffffff802af5f8>] handle_fasteoi_irq+0x9d/0xe3
> [<ffffffff80267c85>] do_IRQ+0x104/0x11f
> [<ffffffff80259621>] ret_from_intr+0x0/0xa
> DWARF2 unwinder stuck at ret_from_intr+0x0/0xa
>
> Leftover inexact backtrace:
>
> <IRQ> <EOI> [<ffffffff802ee4ac>] sysfs_hash_and_remove+0x9/0x137
> [<ffffffff802eed13>] sysfs_remove_file+0x10/0x12
> [<ffffffff8038baf7>] class_device_remove_file+0x12/0x14
> [<ffffffff8822aa02>] :ohci_hcd:ohci_stop+0xf5/0x17b
> [<ffffffff8818d9d2>] :usbcore:usb_remove_hcd+0xdc/0x114
> [<ffffffff8040f8eb>] klist_release+0x0/0x82
> [<ffffffff88197f45>] :usbcore:usb_hcd_pci_remove+0x1e/0x7d
> [<ffffffff803204d8>] pci_device_remove+0x25/0x3c
> [<ffffffff8038b1b5>] __device_release_driver+0x80/0x9c
> [<ffffffff8038b617>] driver_detach+0xac/0xee
> [<ffffffff8038ad92>] bus_remove_driver+0x75/0x98
> [<ffffffff8038b696>] driver_unregister+0x15/0x21
> [<ffffffff80320686>] pci_unregister_driver+0x13/0x8e
> [<ffffffff8822cd1c>] :ohci_hcd:ohci_hcd_pci_cleanup+0x10/0x12
> [<ffffffff8029b281>] sys_delete_module+0x1b5/0x1e6
> [<ffffffff8025910e>] system_call+0x7e/0x83
>
>
> Code: 8a 98 74 02 00 00 e8 d6 3b 03 f8 48 89 45 d0 41 8b 84 24 e4
> RIP [<ffffffff8822c185>] :ohci_hcd:ohci_hub_status_data+0x25/0x27b
> RSP <ffffffff805c7e18>
> CR2: 0000000000000274
> <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
>
> where
>
> (gdb) l *ohci_hub_status_data+0x25
> 0x4185 is in ohci_hub_status_data (drivers/usb/host/ohci-hub.c:316).
> 311 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
> 312 int i, changed = 0, length = 1;
> 313 int can_suspend;
> 314 unsigned long flags;
> 315
> 316 can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);
> 317 spin_lock_irqsave (&ohci->lock, flags);
> 318
> 319 /* handle autosuspended root: finish resuming before
> 320 * letting khubd or root hub timer see state changes.
>
> I guess it may be related to the suspend issues?
No, this is completely separate. The suspend issue involved ehci-hcd, not
ohci-hcd.
This problem has already been identified by Pete Zaitcev in this thread:
http://marc.theaimsgroup.com/?t=115769512800001&r=1&w=2
Perhaps Pete has an updated patch to fix the problem. If not, I could
write one.
Alan Stern
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