On Mon, 18 May 2009, Benjamin Herrenschmidt wrote: > Hi folks ! > > Current kernels give the oops below at boot with my Keyspan plugged, > used to work fine on 2.6.28 at least. Does your test kernel include commit 2d93148ab6988cad872e65d694c95e8944e1b626? > It looks to me like some kind of race between the disconnection after > the FW load and the re-connect but I'm not sure. I don't think that's quite right. Your trace shows the oops occurred during the disconnect processing, which means the re-connect had not yet started. > Cheers, > Ben. > > usbcore: registered new interface driver usbserial > USB Serial support registered for generic > usbcore: registered new interface driver usbserial_generic > usbserial: USB Serial Driver core > USB Serial support registered for Keyspan - (without firmware) > USB Serial support registered for Keyspan 1 port adapter > USB Serial support registered for Keyspan 2 port adapter > USB Serial support registered for Keyspan 4 port adapter > keyspan 2-1:1.0: Keyspan - (without firmware) converter detected > usb 2-1: firmware: using built-in firmware keyspan/usa49w.fw > usb 2-1: USB disconnect, address 2 > usbcore: registered new interface driver keyspan > keyspan: v1.1.5:Keyspan USB to Serial Converter Driver > Unable to handle kernel paging request for data at address 0x00000010 > Faulting instruction address: 0xc0000000002da15c > Oops: Kernel access of bad area, sig: 11 [#1] > SMP NR_CPUS=4 PowerMac > Modules linked in: snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd keyspan uninorth_agp usbserial agpgart soundcore > NIP: c0000000002da15c LR: c0000000002d3760 CTR: c0000000002d35ec > REGS: c00000017a4cb4c0 TRAP: 0300 Not tainted (2.6.30-rc6-00037-g8646010-dirty) > MSR: 9000000000009032 <EE,ME,IR,DR> CR: 24000024 XER: 200fffff > DAR: 0000000000000010, DSISR: 0000000040000000 > TASK = c00000017a4890e0[191] 'khubd' THREAD: c00000017a4c8000 CPU: 2 > GPR00: c000000000755f30 c00000017a4cb740 c000000000783d48 0000000000000001 > GPR04: 0000000000000000 c0000001783fba90 0000000000000001 0000000000000000 > GPR08: 0000000000000000 0000000000000000 0000000000000000 c0000000002d35ec > GPR12: 0000000024000082 c0000000007b5680 0000000000000002 c0000001781c0a30 > GPR16: 00000000000003e8 0000000000000000 c0000001781fd000 c0000001781c0a30 > GPR20: 0000000000000000 0000000000000000 c0000001781fd800 0000000000000001 > GPR24: c00000017a41a600 c0000001789ab480 c0000001783fb998 0000000000000000 > GPR28: 0000000000000000 c00000017a4cb7b0 c00000000070f8d0 0000000000000000 > NIP [c0000000002da15c] .release_nodes+0x54/0x254 > LR [c0000000002d3760] .device_del+0x174/0x1e8 > Call Trace: > [c00000017a4cb740] [c00000017a4cb880] 0xc00000017a4cb880 (unreliable) > [c00000017a4cb7f0] [c0000000002d3760] .device_del+0x174/0x1e8 Is it possible to pin this down to a single bad data access or instruction? 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
