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    Subject2.6.0-test4 - PL2303 OOPS - see also 2.4.22: OOPS on disconnect PL2303 adapter
    Date
    PL2303 is used to connect the serial console on a classic serial port 
    of a test machine. HW nandshaking is used
    The test machine reboots once a minute and dumps lots of messages

    Frequently:
    - driver hangs
    - userspace (cu) can't be stopped
    - pl2303 and/or usbserial can't be unloaded
    - USB interrupts stop
    - problems result in requiring a reboot.


    - None of these problems seen before fixes such as "send break"
    (which works) were made
    - Feels like buffer heads get out of synch at times
    - Changing Baudrates from 115200 to 38400 or 9600 has no effect
    - It seems to be worse than ever even with oopses _now_ as it
    has been used for many months and none were seen

    - 2.4.21,22 behave essentially the same

    Regards
    Michael

    Aug 31 11:39:40 mhfl2 kernel: Linux version 2.6.0-test4-mhf60 (mhf@mhfl4) (gcc version 2.95.3 20010315 (release)) #5 Sun Aug 31 09:37:06 HKT 2003

    []

    Sep 1 18:24:01 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver usbfs
    Sep 1 18:24:01 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver hub
    Sep 1 18:24:02 mhfl2 kernel: ohci-hcd 0000:00:14.0: OHCI Host Controller
    Sep 1 18:24:02 mhfl2 kernel: ohci-hcd 0000:00:14.0: irq 11, pci mem cf8a4000
    Sep 1 18:24:02 mhfl2 kernel: ohci-hcd 0000:00:14.0: new USB bus registered, assigned bus number 1
    Sep 1 18:24:02 mhfl2 kernel: usb usb1: Product: OHCI Host Controller
    Sep 1 18:24:02 mhfl2 kernel: usb usb1: Manufacturer: Linux 2.6.0-test4-mhf60 ohci-hcd
    Sep 1 18:24:02 mhfl2 kernel: usb usb1: SerialNumber: 0000:00:14.0
    Sep 1 18:24:02 mhfl2 kernel: hub 1-0:0: USB hub found
    Sep 1 18:24:02 mhfl2 kernel: hub 1-0:0: 2 ports detected
    Sep 1 18:24:03 mhfl2 kernel: SCSI subsystem initialized
    Sep 1 18:24:03 mhfl2 kernel: hub 1-0:0: debounce: port 2: delay 100ms stable 4 status 0x101
    Sep 1 18:24:03 mhfl2 kernel: hub 1-0:0: new USB device on port 2, assigned address 2
    Sep 1 18:24:03 mhfl2 kernel: Initializing USB Mass Storage driver...
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver usb-storage
    Sep 1 18:24:03 mhfl2 kernel: USB Mass Storage support registered.
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for Generic
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver usbserial
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core v2.0
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for PL-2303
    Sep 1 18:24:03 mhfl2 kernel: pl2303 1-2:0: PL-2303 converter detected
    Sep 1 18:24:03 mhfl2 kernel: usb 1-2: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver pl2303
    Sep 1 18:24:03 mhfl2 kernel: drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver v0.10
    Sep 1 18:24:04 mhfl2 kernel: lp: driver loaded but no devices found
    Sep 1 18:24:21 mhfl2 rpc.mountd: authenticated unmount request from mhfl4:997 for / (/)
    Sep 1 18:27:43 mhfl2 httpd: httpd startup succeeded
    Sep 1 10:39:48 mhfl2 named[446]: no longer listening on 203.151.225.157#53
    Sep 1 18:42:46 mhfl2 kernel: usb 1-2: USB disconnect, address 2
    Sep 1 18:42:46 mhfl2 kernel: usb 1-2: pl2303_write_bulk_callback - failed resubmitting write urb, error -19
    Sep 1 18:42:46 mhfl2 kernel: pl2303 1-2:0: device disconnected
    Sep 1 18:42:50 mhfl2 kernel: drivers/usb/core/usb.c: deregistering driver usb-storage
    Sep 1 18:42:50 mhfl2 kernel: ohci-hcd 0000:00:14.0: remove, state 3
    Sep 1 18:42:50 mhfl2 kernel: usb usb1: USB disconnect, address 1
    Sep 1 18:42:50 mhfl2 kernel: ohci-hcd 0000:00:14.0: USB bus 1 deregistered
    Sep 1 18:43:06 mhfl2 kernel: PL-2303 ttyUSB0: PL-2303 converter now disconnected from ttyUSB0
    Sep 1 18:43:06 mhfl2 kernel: Unable to handle kernel paging request at virtual address cf8b61a8
    Sep 1 18:43:06 mhfl2 kernel: printing eip:
    Sep 1 18:43:06 mhfl2 kernel: cf890d94
    Sep 1 18:43:06 mhfl2 kernel: *pde = 012b4067
    Sep 1 18:43:06 mhfl2 kernel: *pte = 00000000
    Sep 1 18:43:06 mhfl2 kernel: Oops: 0000 [#1]
    Sep 1 18:43:06 mhfl2 kernel: CPU: 0
    Sep 1 18:43:06 mhfl2 kernel: EIP: 0060:[<cf890d94>] Not tainted
    Sep 1 18:43:06 mhfl2 kernel: EFLAGS: 00010282
    Sep 1 18:43:06 mhfl2 kernel: EIP is at hcd_pci_release+0x14/0x20 [usbcore]
    Sep 1 18:43:06 mhfl2 kernel: eax: cf8b6180 ebx: c0396ec0 ecx: cf8a0240 edx: c8d0e634
    Sep 1 18:43:06 mhfl2 kernel: esi: 00000001 edi: cb3abf00 ebp: cb667de4 esp: cb667de0
    Sep 1 18:43:06 mhfl2 kernel: ds: 007b es: 007b ss: 0068
    Sep 1 18:43:06 mhfl2 kernel: Process cu (pid: 6269, threadinfo=cb666000 task=c7e39900)
    Sep 1 18:43:06 mhfl2 kernel: Stack: c8d0e634 cb667df0 cf88d3c6 c8d0e634 cb667dfc c0233360 c8d0e67c cb667e0c
    Sep 1 18:43:06 mhfl2 kernel: c01d2498 c8d0e684 ca0a7400 cb667e18 c01d24ca c8d0e684 cb667e24 c02336cf
    Sep 1 18:43:06 mhfl2 kernel: c8d0e684 cb667e30 cf88d3ab c8d0e67c cb667e44 cf8897ee c8d0e634 ca0a7400
    Sep 1 18:43:06 mhfl2 kernel: Call Trace:
    Sep 1 18:43:06 mhfl2 kernel: [<cf88d3c6>] usb_host_release+0x16/0x1c [usbcore]
    Sep 1 18:43:06 mhfl2 kernel: [<c0233360>] class_dev_release+0x18/0x50
    Sep 1 18:43:06 mhfl2 kernel: [<c01d2498>] kobject_cleanup+0x28/0x44
    Sep 1 18:43:06 mhfl2 kernel: [<c01d24ca>] kobject_put+0x16/0x1c
    Sep 1 18:43:06 mhfl2 kernel: [<c02336cf>] class_device_put+0xf/0x14
    Sep 1 18:43:06 mhfl2 kernel: [<cf88d3ab>] usb_bus_put+0x13/0x18 [usbcore]
    Sep 1 18:43:06 mhfl2 kernel: [<cf8897ee>] usb_release_dev+0x3a/0x48 [usbcore]
    Sep 1 18:43:06 mhfl2 kernel: [<c0231b0a>] device_release+0x16/0x50
    Sep 1 18:43:06 mhfl2 kernel: [<c01d2498>] kobject_cleanup+0x28/0x44
    Sep 1 18:43:06 mhfl2 kernel: [<c01d24ca>] kobject_put+0x16/0x1c
    Sep 1 18:43:06 mhfl2 kernel: [<c0231ddb>] put_device+0xf/0x14
    Sep 1 18:43:06 mhfl2 kernel: [<cf889931>] usb_put_dev+0x15/0x1c [usbcore]
    Sep 1 18:43:06 mhfl2 kernel: [<cf9100b6>] destroy_serial+0x16e/0x180 [usbserial]
    Sep 1 18:43:06 mhfl2 kernel: [<c01d2498>] kobject_cleanup+0x28/0x44
    Sep 1 18:43:06 mhfl2 kernel: [<c01d24ca>] kobject_put+0x16/0x1c
    Sep 1 18:43:06 mhfl2 kernel: [<cf90f31c>] __serial_close+0x84/0x8c [usbserial]
    Sep 1 18:43:06 mhfl2 kernel: [<cf90f3b7>] serial_close+0x93/0xb0 [usbserial]
    Sep 1 18:43:06 mhfl2 kernel: [<c02199ac>] release_dev+0x23c/0x5c8
    Sep 1 18:43:06 mhfl2 kernel: [<c0121258>] update_process_times+0x2c/0x38
    Sep 1 18:43:06 mhfl2 kernel: [<c0121136>] update_wall_time+0xe/0x38
    Sep 1 18:43:06 mhfl2 kernel: [<c021a058>] tty_release+0xc/0x14
    Sep 1 18:43:06 mhfl2 kernel: [<c014705f>] __fput+0x43/0xd8
    Sep 1 18:43:06 mhfl2 kernel: [<c0147016>] fput+0x16/0x1c
    Sep 1 18:43:06 mhfl2 kernel: [<c0145daf>] filp_close+0x97/0xa4
    Sep 1 18:43:06 mhfl2 kernel: [<c0145e07>] sys_close+0x4b/0x60
    Sep 1 18:43:06 mhfl2 kernel: [<c010adc7>] syscall_call+0x7/0xb
    Sep 1 18:43:06 mhfl2 kernel:
    Sep 1 18:43:06 mhfl2 kernel: Code: 8b 40 28 ff d0 89 ec 5d c3 8d 76 00 55 89 e5 83 ec 20 8d 45
    Sep 1 18:43:42 mhfl2 kernel: <6>drivers/usb/core/usb.c: deregistering driver pl2303
    Sep 1 18:43:42 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver PL-2303
    Sep 1 18:44:08 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for PL-2303
    Sep 1 18:44:08 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver pl2303
    Sep 1 18:44:08 mhfl2 kernel: drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver v0.10
    Sep 1 18:45:24 mhfl2 kernel: drivers/usb/core/usb.c: deregistering driver pl2303
    Sep 1 18:45:24 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver PL-2303
    Sep 1 18:45:50 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver Generic
    Sep 1 18:45:50 mhfl2 kernel: drivers/usb/core/usb.c: deregistering driver usbserial
    Sep 1 18:46:02 mhfl2 kernel: drivers/usb/core/usb.c: deregistering driver usbfs
    Sep 1 18:46:02 mhfl2 kernel: drivers/usb/core/usb.c: deregistering driver hub
    Sep 1 18:46:07 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver usbfs
    Sep 1 18:46:07 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver hub
    Sep 1 18:46:07 mhfl2 kernel: ohci-hcd 0000:00:14.0: OHCI Host Controller
    Sep 1 18:46:07 mhfl2 kernel: ohci-hcd 0000:00:14.0: irq 11, pci mem cf8a4000
    Sep 1 18:46:07 mhfl2 kernel: ohci-hcd 0000:00:14.0: new USB bus registered, assigned bus number 1
    Sep 1 18:46:08 mhfl2 kernel: usb usb1: Product: OHCI Host Controller
    Sep 1 18:46:08 mhfl2 kernel: usb usb1: Manufacturer: Linux 2.6.0-test4-mhf60 ohci-hcd
    Sep 1 18:46:08 mhfl2 kernel: usb usb1: SerialNumber: 0000:00:14.0
    Sep 1 18:46:08 mhfl2 kernel: hub 1-0:0: USB hub found
    Sep 1 18:46:08 mhfl2 kernel: hub 1-0:0: 2 ports detected
    Sep 1 18:46:08 mhfl2 kernel: SCSI subsystem initialized
    Sep 1 18:46:08 mhfl2 kernel: Initializing USB Mass Storage driver...
    Sep 1 18:46:08 mhfl2 kernel: drivers/usb/core/usb.c: registered new driver usb-storage
    Sep 1 18:46:08 mhfl2 kernel: USB Mass Storage support registered.
    Sep 1 18:46:08 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for Generic
    Sep 1 18:46:08 mhfl2 kernel: drivers/usb/serial/usb-serial.c: usb_serial_init - tty_register_driver failed
    Sep 1 18:46:08 mhfl2 kernel: drivers/usb/serial/usb-serial.c: USB Serial deregistering driver Generic
    Sep 1 18:46:08 mhfl2 kernel: drivers/usb/serial/usb-serial.c: usb_serial_init - returning with error -16
    Sep 1 18:46:08 mhfl2 kernel: pl2303: Unknown symbol usb_serial_disconnect
    Sep 1 18:46:08 mhfl2 kernel: pl2303: Unknown symbol usb_serial_probe
    Sep 1 18:46:08 mhfl2 kernel: pl2303: Unknown symbol usb_serial_register
    Sep 1 18:46:08 mhfl2 kernel: pl2303: Unknown symbol usb_serial_deregister
    Sep 1 18:46:08 mhfl2 kernel: lp: driver loaded but no devices found

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