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
