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    SubjectRe: Kernel coredump about kblockd deadlock
    From
    hi all:
    2012/1/15 loody <miloody@gmail.com>:
    > Dear all:
    > I use kernel 2.6.35.13 and cpu for mips
    > When I plug in/out usb stick for several times I got following warning
    > messages as I append at the end of mail.
    >
    > is it possible correlate to below issue
    > http://thread.gmane.org/gmane.linux.kernel/1177383/focus=69879
    I want to reproduce the issue of the thread above in my platform.
    But I have no idea about:
    1 dm-multipath
    2. dm-round-robin

    are they additional module I need to download or it already include
    kernel source?
    if the later, which config I shout select?

    Appreciate your help,

    >
    >
    > INFO: task kblockd/0:10 blocked for more than 120 seconds.
    > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    > kblockd/0        D [87016a78] 802d1e48     0    10 0x00100000      2
    >          11       9      (kernel thread)
    > Stack : 00000001 80107148 8562ed80 800e9098 00000001 00000001 7fffffff 00000000
    >        00000000 7fffffff 87053d38 ffffffff 87053d38 87053d28 872ff00c 802d1e48
    >        00000001 00000009 00000102 80071c80 00005965 0056addf 00005965 00000001
    >        00000000 00000000 7fffffff 80020c64 00000000 00000002 00000000 00000000
    >        7fffffff 802d1ca8 00000000 80024538 00000004 0000000a 00000001 87016a78
    >        ...
    > Call Trace:
    > [<802d1764>] schedule+0x648/0x70c from[<802d1e48>] schedule_timeout+0x30/0x324
    > [<802d1e48>] schedule_timeout+0x30/0x324 from[<802d1ca8>]
    > wait_for_common+0xf8/0x1c0
    > [<802d1ca8>] wait_for_common+0xf8/0x1c0 from[<80044400>]
    > __cancel_work_timer+0x188/0x210
    > [<80044400>] __cancel_work_timer+0x188/0x210 from[<801a48c4>]
    > blk_cleanup_queue+0x18/0x6c
    > [<801a48c4>] blk_cleanup_queue+0x18/0x6c from[<802098f4>]
    > scsi_device_dev_release_usercontext+0x174/0x1e4
    > [<802098f4>] scsi_device_dev_release_usercontext+0x174/0x1e4
    > from[<80043aa8>] execute_in_process_context+0x30/0x5c
    > [<80043aa8>] execute_in_process_context+0x30/0x5c from[<801eeda8>]
    > device_release+0x54/0x90
    > [<801eeda8>] device_release+0x54/0x90 from[<801b0180>] kobject_release+0x70/0xa8
    > [<801b0180>] kobject_release+0x70/0xa8 from[<801b17bc>] kref_put+0x80/0x98
    > [<801b17bc>] kref_put+0x80/0x98 from[<80203c04>] scsi_request_fn+0x51c/0x61c
    > [<80203c04>] scsi_request_fn+0x51c/0x61c from[<801a482c>]
    > generic_unplug_device+0x38/0x7c
    > [<801a482c>] generic_unplug_device+0x38/0x7c from[<80043e90>]
    > worker_thread+0x1ec/0x2d4
    > [<80043e90>] worker_thread+0x1ec/0x2d4 from[<800482c4>] kthread+0x7c/0x84
    > [<800482c4>] kthread+0x7c/0x84 from[<80007818>] kernel_thread_helper+0x10/0x18
    >
    > -------------------------------------------------------------------------------------
    > hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
    > hub 1-0:1.0: port 1, status 0000, change 0001, 12 Mb/s
    > usb 1-1: USB disconnect, address 35
    > usb 1-1: unregistering device
    > usb 1-1: unregistering interface 1-1:1.0
    > usb 1-1: usb_disable_device nuking all URBs
    > hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x0
    > hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
    > ehci-ehci ehci-ehci.0: GetStatus port 1 status 000803 sig=j CSC CONNECT
    > hub 1-0:1.0: port 1, status 0401, change 0001, 480 Mb/s
    > hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x401
    > ehci-ehci ehci-ehci.0: port 1 high speed
    > ehci-ehci ehci-ehci.0: GetStatus port 1 status 00000d sig=se0 PEC PE CONNECT
    > usb 1-1: new high speed USB device using ehci-ehci and address 36
    > ehci-ehci ehci-ehci.0: port 1 high speed
    > ehci-ehci ehci-ehci.0: GetStatus port 1 status 00000d sig=se0 PEC PE CONNECT
    > usb 1-1: default language 0x0409
    > usb 1-1: udev 36, busnum 1, minor = 35

    --
    Regards,
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