On Wed, 2011-11-23 at 22:40 -0500, Alan Stern wrote: > On Wed, 23 Nov 2011, Geoff Levand wrote: > > > > > > kernel BUG at drivers/usb/host/ehci-mem.c:74! > > > > > > > > > > This means some qh was still linked (or something similar) when it was > > > > > removed. I don't see how these are connected to the root hub stopping. > > > > > > > > I think it is because when the HC frame index stops incrementing the qh > > > > processing does not finish up, so it is still linked. > > > > > > I would expect the IAA watchdog timer to catch something like that. > > > > I'll do some more investigation into this error and give a more > > detailed report. I have not been able to reproduce this with current kernels. It could be due to a USB code change, or due to a change in kernel config options selected in my .config. I'll continue to try to reproduce. Here is what was seen: <6>ps3-ehci-driver sb_08: USB bus 4 deregistered <6>ps3-ohci-driver sb_07: remove, state 4 <6>usb usb1: USB disconnect, address 1 <6>ps3-ohci-driver sb_07: USB bus 1 deregistered <6>ps3-ehci-driver sb_06: remove, state 4 <6>usb usb2: USB disconnect, address 1 <6>usb 2-1: USB disconnect, address 2 <6>usb 2-2: USB disconnect, address 3 <0>------------[ cut here ]------------ <2>kernel BUG at ps3-linux-dev/drivers/usb/host/ehci-mem.c:74! Oops: Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=2 PS3 Modules linked in: rfcomm sco bnep l2cap btusb bluetooth usb_storage snd_ps3 snd_pcm ps3_lpm snd_page_alloc snd_timer snd ehci_hcd ohci_hcd sg soundcore usbcore [last unloaded: scsi_wait_scan] NIP: d0000000005452a8 LR: d0000000005454a8 CTR: 0000000000000000 REGS: c00000001e1d35b0 TRAP: 0700 Not tainted (2.6.28-rc3-00872-ga6d1ff4) MSR: 8000000000028032 <EE,IR,DR> CR: 24000428 XER: 00000000 TASK = c000000006b122c0[1049] 'reboot' THREAD: c00000001e1d0000 CPU: 0 <6>GPR00: c000000006f74140 c00000001e1d3830 d0000000005526f8 c000000006d9f570 <6>GPR04: 0000000000000000 d00000000054549c 0000000000000183 c000000006b122c0 <6>GPR08: 0000000000000000 c000000006f74058 0000000000000000 c000000000b259b0 <6>GPR12: 0000000024000424 c00000000059d300 00000000100f6210 0000000000000000 <6>GPR16: 00000000100f4a38 00000000100cfb88 00000000100f4bdc 00000000100f4b4c <6>GPR20: 00000000100f495c 00000000100f496c 00000000100f4a60 0000000000000000 <6>GPR24: 0000000000000000 0000000000000000 d0000000003036c8 0000000000000000 <6>GPR28: c000000006d9f570 c000000006f74000 d000000000552080 c000000006d9f570 NIP [d0000000005452a8] .ehci_mem_cleanup+0x60/0x198 [ehci_hcd] LR [d0000000005454a8] .ehci_stop+0xc8/0x120 [ehci_hcd] Call Trace: [c00000001e1d3830] [c00000000033ad20] ._spin_unlock_irq+0x44/0x5c (unreliable) [c00000001e1d38c0] [d0000000005454a8] .ehci_stop+0xc8/0x120 [ehci_hcd] [c00000001e1d3950] [d0000000002dbfec] .usb_remove_hcd+0x10c/0x184 [usbcore] [c00000001e1d39f0] [d00000000053eba0] .ps3_ehci_remove+0x48/0xe0 [ehci_hcd] [c00000001e1d3a90] [c000000000041508] .ps3_system_bus_shutdown+0x70/0x90 [c00000001e1d3b00] [c000000000210fc4] .device_shutdown+0x88/0xf0 [c00000001e1d3b90] [c000000000066824] .kernel_restart_prepare+0x38/0x58 [c00000001e1d3c10] [c0000000000668b0] .kernel_restart+0x20/0x6c [c00000001e1d3c90] [c000000000066ad8] .sys_reboot+0x1d4/0x238 [c00000001e1d3e30] [c0000000000074dc] syscall_exit+0x0/0x40 Instruction dump: 79290020 2fa90000 913d0080 409e005c 393d0058 e81d0058 eb9d0078 7fa04800 409e0010 e81d0050 2fa00000 419e000c <0fe00000> 48000000 e89d0068 2fa40000 <4>---[ end trace b4f42db0532e8a81 ]--- -Geoff -- 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
