Alan, I get a broken urb_index, pointing the lookup somewhere really obscure. Regards, Christian > On Wed, 2 May 2012, Christian Melki wrote: > > > Hello. > > > > I can reliably reproduce an Oops on our Freescale 8347:e with a > > Logitech webcam. Strange part is that I can only do it using > > usb-audio, never with the same device using uvcvideo or usb-storage. > > It usually occurs within seconds of streaming from the USB-audio > > device. I have ported everything on our platfrom from our 2.6.32 > > kernel to 3.3.2. USB never gave me an issue on 2.6.32 and I can't > > figure out why it would die in ehci_work like this. > > It's probably not ehci_work() itself, but a subroutine call > that was inlined. > > > > > Unable to handle kernel paging request for data at address > 0xbe903df8 > > Faulting instruction address: 0xc01f45d4 > > Can you figure out what C statement corresponds to that address? > Perhaps by putting printk statements at strategic spots in > scan_async() and scan_periodic(). > > > Oops: Kernel access of bad area, sig: 11 [#1] PREEMPT > ASP8347E Modules > > linked in: > > NIP: c01f45d4 LR: c01f41b0 CTR: 00000008 > > REGS: c3ff7e30 TRAP: 0300 Not tainted (3.3.2) > > MSR: 00001032 <ME,IR,DR,RI> CR: 24482422 XER: 20000000 > > DAR: be903df8, DSISR: 22000000 > > TASK = c31996e0[2261] 'cap' THREAD: c31aa000 > > GPR00: 00000000 c3ff7ee0 c31996e0 c3a0438c c3b03d80 > c31b3ba0 00000000 > > 00000000 > > GPR08: be903dec 00000000 ffadffff c33b311c 44448484 > 1001a448 00000e68 > > c3a04328 > > GPR16: 00000000 01000000 00000e60 000001cd 000001cd > 00000730 c3a0438c > > c3a04390 > > GPR24: c3a0f730 00000000 c3b72de0 c3a09f30 00000000 > c3a042d8 00000000 > > c33b30a0 NIP [c01f45d4] ehci_work+0x8f4/0xac4 LR [c01f41b0] > > ehci_work+0x4d0/0xac4 Call Trace: > > [c3ff7ee0] [c01f41b0] ehci_work+0x4d0/0xac4 (unreliable) [c3ff7f40] > > [c01f4c18] ehci_irq+0x284/0x2b4 [c3ff7f70] [c01dde24] > > usb_hcd_irq+0x44/0x6c [c3ff7f80] [c005ba10] > > handle_irq_event_percpu+0x74/0x1b0 > > [c3ff7fc0] [c005bba0] handle_irq_event+0x54/0x90 [c3ff7fe0] > [c005e338] > > handle_level_irq+0xa0/0x114 [c3ff7ff0] [c000dd48] > > call_handle_irq+0x18/0x28 [c31abf10] [c0005784] do_IRQ+0xe0/0x138 > > [c31abf40] [c000fb64] ret_from_except+0x0/0x14 > > --- Exception: 501 at 0xff1565c > > LR = 0xff15658 > > Instruction dump: > > 7cff3a14 55082036 38070004 7d044214 3908000c 7c00042c 74077000 > > 932bff88 408200e0 2f800000 419c00cc 5400853e <90e8000c> 90080008 > > 81040058 7c080214 ---[ end trace c2cdbb4339c562c5 ]--- > > It's hard to tell what's wrong just from this. > > Alan Stern > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
