On Tue, 31 Jul 2007 16:27:51 -0400 (EDT) Alan Stern <[EMAIL PROTECTED]> wrote:
> > Here's a diagnotic patch to try under 2.6.22. It should add some > interesting information to the kernel log, starting from the point > where the modem gets plugged in. > The kernel 2.6.22 was patched and recompiled. It shouldn't make a difference but the problem occurs only if I load the modules _before_ plugging in the external modem. If I load the modules _after_ plugging in the modem, the problem disappears. (At least this is what happens with the patched kernel. I'll revert back to the unpatched and see if this is still the case.) Here is the kernel log when the modules are loaded first and then the modem is plugged in (the machine has just been rebooted): usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb USB Universal Host Controller Interface driver v3.0 ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 20 PCI: Setting latency timer of device 0000:00:1d.0 to 64 uhci_hcd 0000:00:1d.0: UHCI Host Controller uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 uhci_hcd 0000:00:1d.0: irq 20, io base 0x00006000 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected hub 1-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.1[B] -> GSI 17 (level, low) -> IRQ 17 PCI: Setting latency timer of device 0000:00:1d.1 to 64 uhci_hcd 0000:00:1d.1: UHCI Host Controller uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 uhci_hcd 0000:00:1d.1: irq 17, io base 0x00006400 usb usb2: configuration #1 chosen from 1 choice hub 2-0:1.0: USB hub found hub 2-0:1.0: 2 ports detected hub 2-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 18 PCI: Setting latency timer of device 0000:00:1d.2 to 64 uhci_hcd 0000:00:1d.2: UHCI Host Controller uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 uhci_hcd 0000:00:1d.2: irq 18, io base 0x00006800 usb usb3: configuration #1 chosen from 1 choice hub 3-0:1.0: USB hub found hub 3-0:1.0: 2 ports detected hub 3-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.3[D] -> GSI 19 (level, low) -> IRQ 19 PCI: Setting latency timer of device 0000:00:1d.3 to 64 uhci_hcd 0000:00:1d.3: UHCI Host Controller uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4 uhci_hcd 0000:00:1d.3: irq 19, io base 0x00007000 usb usb4: configuration #1 chosen from 1 choice hub 4-0:1.0: USB hub found hub 4-0:1.0: 2 ports detected hub 4-0:1.0: Create sysfs intf files usbcore: registered new interface driver cdc_acm drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters usb 2-2: new full speed USB device using uhci_hcd and address 2 usb 2-2: configuration #2 chosen from 2 choices cdc_acm 2-2:2.0: ttyACM0: USB ACM device cdc_acm 2-2:2.0: Create sysfs intf files cdc_acm 2-2:2.1: Create sysfs intf files usbcore: deregistering interface driver cdc_acm cdc_acm 2-2:2.1: Remove sysfs intf files cdc_acm 2-2:2.1: Create sysfs intf files cdc_acm 2-2:2.0: Remove sysfs intf files cdc_acm 2-2:2.0: Create sysfs intf files uhci_hcd 0000:00:1d.3: remove, state 1 usb usb4: USB disconnect, address 1 hub 4-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.3: USB bus 4 deregistered ACPI: PCI interrupt for device 0000:00:1d.3 disabled uhci_hcd 0000:00:1d.2: remove, state 1 usb usb3: USB disconnect, address 1 hub 3-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.2: USB bus 3 deregistered ACPI: PCI interrupt for device 0000:00:1d.2 disabled uhci_hcd 0000:00:1d.1: remove, state 1 usb usb2: USB disconnect, address 1 usb 2-2: USB disconnect, address 2 usb 2-2:2.0: Remove sysfs intf files Unable to handle kernel paging request at ffffffff8802a440 RIP: [sysfs_get_name+46/65] sysfs_get_name+0x2e/0x41 PGD 203067 PUD 205063 PMD 7a6c6067 PTE 0 Oops: 0000 [1] SMP CPU 1 Modules linked in: uhci_hcd usbcore Pid: 730, comm: rmmod Not tainted 2.6.22 #4 RIP: 0010:[sysfs_get_name+46/65] [sysfs_get_name+46/65] sysfs_get_name+0x2e/0x41 RSP: 0000:ffff810079b69ce0 EFLAGS: 00010246 RAX: ffffffff8802a440 RBX: ffff810079abf780 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff80423b38 RDI: ffff810079abf4a8 RBP: ffff810079abf4a8 R08: 0000000000000000 R09: 8000000000000000 R10: ffff81007f611ac0 R11: ffffffff80330606 R12: ffff810079abf4b0 R13: ffff81007f741250 R14: ffffffff80423b38 R15: ffffffff88025940 FS: 00002af84fbca6f0(0000) GS:ffff810002f4d140(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffffffff8802a440 CR3: 0000000079b53000 CR4: 00000000000006e0 Process rmmod (pid: 730, threadinfo ffff810079b68000, task ffff810002f8d100) Stack: ffffffff8029b6dd ffff81007cfe4020 ffff81007cfe41a0 ffff810079e1f800 ffff81007cfe4110 ffff810079e1f888 ffffffff80330987 ffff81007cfe4000 ffff81007cfe4000 ffff81007cfe4020 ffffffff80330b96 ffff81007cfe4000 Call Trace: [sysfs_hash_and_remove+104/295] sysfs_hash_and_remove+0x68/0x127 [device_remove_file+37/58] device_remove_file+0x25/0x3a [device_del+375/704] device_del+0x177/0x2c0 [_end+128974510/2131730856] :usbcore:usb_disable_device+0x8b/0xfa [_end+128958961/2131730856] :usbcore:usb_disconnect+0x98/0xee [_end+128958941/2131730856] :usbcore:usb_disconnect+0x84/0xee [_end+128966909/2131730856] :usbcore:usb_remove_hcd+0x85/0xe1 [_end+129007794/2131730856] :usbcore:usb_hcd_pci_remove+0x1d/0x89 [pci_device_remove+36/77] pci_device_remove+0x24/0x4d [__device_release_driver+130/184] __device_release_driver+0x82/0xb8 [driver_detach+252/261] driver_detach+0xfc/0x105 [bus_remove_driver+122/157] bus_remove_driver+0x7a/0x9d [pci_unregister_driver+16/129] pci_unregister_driver+0x10/0x81 [_end+129096572/2131730856] :uhci_hcd:uhci_hcd_cleanup+0x10/0x2c [sys_delete_module+319/444] sys_delete_module+0x13f/0x1bc [__up_write+29/318] __up_write+0x1d/0x13e [system_call+126/131] system_call+0x7e/0x83 Code: 48 8b 00 c3 83 fa 20 74 f7 31 c0 0f 1f 00 c3 0f 0b eb fe 41 RIP [sysfs_get_name+46/65] sysfs_get_name+0x2e/0x41 RSP <ffff810079b69ce0> CR2: ffffffff8802a440 Now, here is the kernel log when the modem is plugged in first and then the modules are loaded (the machine has just been rebooted): usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb USB Universal Host Controller Interface driver v3.0 ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 20 PCI: Setting latency timer of device 0000:00:1d.0 to 64 uhci_hcd 0000:00:1d.0: UHCI Host Controller uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 uhci_hcd 0000:00:1d.0: irq 20, io base 0x00006000 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected hub 1-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.1[B] -> GSI 17 (level, low) -> IRQ 17 PCI: Setting latency timer of device 0000:00:1d.1 to 64 uhci_hcd 0000:00:1d.1: UHCI Host Controller uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 uhci_hcd 0000:00:1d.1: irq 17, io base 0x00006400 usb usb2: configuration #1 chosen from 1 choice hub 2-0:1.0: USB hub found hub 2-0:1.0: 2 ports detected hub 2-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 18 PCI: Setting latency timer of device 0000:00:1d.2 to 64 uhci_hcd 0000:00:1d.2: UHCI Host Controller uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 uhci_hcd 0000:00:1d.2: irq 18, io base 0x00006800 usb usb3: configuration #1 chosen from 1 choice hub 3-0:1.0: USB hub found hub 3-0:1.0: 2 ports detected hub 3-0:1.0: Create sysfs intf files ACPI: PCI Interrupt 0000:00:1d.3[D] -> GSI 19 (level, low) -> IRQ 19 PCI: Setting latency timer of device 0000:00:1d.3 to 64 uhci_hcd 0000:00:1d.3: UHCI Host Controller uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4 uhci_hcd 0000:00:1d.3: irq 19, io base 0x00007000 usb usb4: configuration #1 chosen from 1 choice hub 4-0:1.0: USB hub found hub 4-0:1.0: 2 ports detected hub 4-0:1.0: Create sysfs intf files usb 2-2: new full speed USB device using uhci_hcd and address 2 usb 2-2: configuration #2 chosen from 2 choices usb 2-2:2.0: Create sysfs intf files usb 2-2:2.1: Create sysfs intf files cdc_acm 2-2:2.0: ttyACM0: USB ACM device usbcore: registered new interface driver cdc_acm drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters usbcore: deregistering interface driver cdc_acm cdc_acm 2-2:2.1: Remove sysfs intf files cdc_acm 2-2:2.1: Create sysfs intf files cdc_acm 2-2:2.0: Remove sysfs intf files cdc_acm 2-2:2.0: Create sysfs intf files uhci_hcd 0000:00:1d.3: remove, state 1 usb usb4: USB disconnect, address 1 hub 4-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.3: USB bus 4 deregistered ACPI: PCI interrupt for device 0000:00:1d.3 disabled uhci_hcd 0000:00:1d.2: remove, state 1 usb usb3: USB disconnect, address 1 hub 3-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.2: USB bus 3 deregistered ACPI: PCI interrupt for device 0000:00:1d.2 disabled uhci_hcd 0000:00:1d.1: remove, state 1 usb usb2: USB disconnect, address 1 usb 2-2: USB disconnect, address 2 usb 2-2:2.0: Remove sysfs intf files usb 2-2:2.1: Remove sysfs intf files hub 2-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.1: USB bus 2 deregistered uhci_hcd 0000:00:1d.1: dma_pool_destroy buffer-128, ffff810079aef000 busy ACPI: PCI interrupt for device 0000:00:1d.1 disabled uhci_hcd 0000:00:1d.0: remove, state 1 usb usb1: USB disconnect, address 1 hub 1-0:1.0: Remove sysfs intf files uhci_hcd 0000:00:1d.0: USB bus 1 deregistered ACPI: PCI interrupt for device 0000:00:1d.0 disabled usbcore: deregistering device driver usb usbcore: deregistering interface driver usbfs usbcore: deregistering interface driver hub AK ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. 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