http://oss.sgi.com/bugzilla/show_bug.cgi?id=916
--- Comment #6 from Dave Chinner <david@xxxxxxxxxxxxx> 2012-03-19 15:26:01 CST
---
(In reply to comment #5)
>
> [ 340.431000] INFO: task khubd:196 blocked for more than 1 seconds.
> [ 340.432000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this
> message.
> [ 340.433000] Pid : 196, Comm: khubd
....
> [ 340.720000]
> [ 340.720000] Call trace:
> [ 340.721000] [<8252eae2>] schedule+0x1c2/0x580
> [ 340.722000] [<8252f036>] preempt_schedule+0x36/0x60
> [ 340.723000] [<8252e920>] schedule+0x0/0x580
> [ 340.724000] [<822961f6>] bdi_sched_wait+0xa/0x34
> [ 340.725000] [<8222e140>] prepare_to_wait+0x0/0xc0
> [ 340.726000] [<8252fa74>] __wait_on_bit+0x74/0xe0
> [ 340.727000] [<822961ec>] bdi_sched_wait+0x0/0x34
> [ 340.728000] [<8252fb26>] out_of_line_wait_on_bit+0x46/0x80
> [ 340.729000] [<8252e848>] printk+0x0/0x30
> [ 340.730000] [<822961ec>] bdi_sched_wait+0x0/0x34
> [ 340.731000] [<8222dee0>] wake_bit_function+0x0/0x60
> [ 340.732000] [<822962b6>] sync_inodes_sb+0x96/0x280
> [ 340.733000] [<8229a54a>] __sync_filesystem+0x2a/0xc0
> [ 340.734000] [<8229a632>] sync_filesystem+0x52/0x80
> [ 340.735000] [<8229a520>] __sync_filesystem+0x0/0xc0
> [ 340.736000] [<822a50d4>] fsync_bdev+0x74/0xc0
> [ 340.737000] [<8252e848>] printk+0x0/0x30
> [ 340.738000] [<823a453e>] invalidate_partition+0x1e/0x60
> [ 340.739000] [<823a4520>] invalidate_partition+0x0/0x60
> [ 340.740000] [<822c2940>] del_gendisk+0x40/0x140
> [ 340.741000] [<82400b7a>] sd_remove+0x3a/0xa0
> [ 340.742000] [<8252f000>] preempt_schedule+0x0/0x60
> [ 340.743000] [<823ec360>] __device_release_driver+0x40/0xa0
> [ 340.744000] [<823e8fd4>] put_device+0x0/0x1c
> [ 340.745000] [<823ec3dc>] device_release_driver+0x1c/0x40
> [ 340.746000] [<822c61e0>] sysfs_remove_link+0x0/0x40
> [ 340.747000] [<823ebf68>] bus_remove_device+0x48/0xa0
> [ 340.748000] [<823e9c4c>] device_del+0xac/0x160
> [ 340.749000] [<823e9ae0>] device_remove_file+0x0/0x20
> [ 340.750000] [<823fe0ca>] __scsi_remove_device+0x8a/0xc0
> [ 340.751000] [<823e8fd4>] put_device+0x0/0x1c
> [ 340.752000] [<823f7b00>] scsi_device_set_state+0x0/0xe0
> [ 340.753000] [<823fcca0>] scsi_forget_host+0x80/0x100
> [ 340.754000] [<823fe040>] __scsi_remove_device+0x0/0xc0
> [ 340.755000] [<823f41ee>] scsi_remove_host+0x6e/0x1c0
> [ 340.757000] [<8243ad60>] remove_intf_ep_devs+0x0/0x80
> [ 340.758000] [<823f38e0>] scsi_host_set_state+0x0/0xa0
> [ 340.759000] [<82451772>] quiesce_and_remove_host+0x92/0x140
> [ 340.760000] [<82211a20>] __wake_up+0x0/0x80
> [ 340.761000] [<824518f6>] usb_stor_disconnect+0x16/0x40
> [ 340.762000] [<8243d2ce>] usb_unbind_interface+0x2e/0x100
> [ 340.763000] [<823ec360>] __device_release_driver+0x40/0xa0
> [ 340.764000] [<823ec3dc>] device_release_driver+0x1c/0x40
> [ 340.765000] [<822c61e0>] sysfs_remove_link+0x0/0x40
> [ 340.766000] [<823ebf68>] bus_remove_device+0x48/0xa0
> [ 340.767000] [<823e9c4c>] device_del+0xac/0x160
> [ 340.768000] [<823e9ae0>] device_remove_file+0x0/0x20
> [ 340.769000] [<8243c29a>] usb_disable_device+0x9a/0x140
> [ 340.770000] [<823e9ba0>] device_del+0x0/0x160
> [ 340.771000] [<82435d7a>] usb_disconnect+0x9a/0x160
> [ 340.772000] [<82436b34>] hub_thread+0x374/0xf00
> [ 340.773000] [<822123c8>] put_prev_task_fair+0xa8/0xe0
> [ 340.774000] [<822105ea>] pick_next_task_fair+0x6a/0xc0
> [ 340.775000] [<823ad180>] find_next_zero_bit+0x0/0xa0
> [ 340.776000] [<82232360>] up+0x0/0xa0
> [ 340.777000] [<8222dea0>] autoremove_wake_function+0x0/0x40
> [ 340.778000] [<8222da80>] kthread+0x60/0x80
> [ 340.780000] [<824367c0>] hub_thread+0x0/0xf00
> [ 340.781000] [<82202da8>] kernel_thread_helper+0x8/0x20
> [ 340.782000] [<8222da20>] kthread+0x0/0x80
> [ 340.783000] [<82202da0>] kernel_thread_helper+0x0/0x20
> [ 340.784000]
You disk has been disconnected (unplugged?) and the USB error handling has
tried to sync the device that just disappeared. That's a bug in the USB or SCSI
error handling layers, not a filesystem problem.
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