Hung task while reading USB mass storage device (2.6.26)

[Neil Schemenauer]

Hi,

This happened with 2.6.26 on an AMD64 machine.  I was attempting to
read an entire partition on a SD card attached to a USB reader.
sysreq-W gives:

dd            D ffff8100010018b8     0  3887   3876
 ffff810062a9dac8 0000000000000046 ffff81002f9ee420 ffff810054f80c28
 ffffffff8047f8c0 ffff810062a9da78 ffff810062a9db58 ffffffff805d4f00
 ffffffff805d4f00 ffffffff805d2270 ffffffff805d4f00 ffff81006e2106d0
Call Trace:
 [<ffffffff8025403b>] find_get_pages_tag+0x34/0x7e
 [<ffffffff80254200>] sync_page+0x0/0x41
 [<ffffffff8045aaab>] io_schedule+0x28/0x33
 [<ffffffff8025423c>] sync_page+0x3c/0x41
 [<ffffffff8045abf0>] __wait_on_bit_lock+0x3f/0x72
 [<ffffffff802541ec>] __lock_page+0x5e/0x64
 [<ffffffff8023ef3e>] wake_bit_function+0x0/0x23
 [<ffffffff8025b884>] pagevec_lookup+0x17/0x1e
 [<ffffffff8025bfae>] truncate_inode_pages_range+0x251/0x2d9
 [<ffffffff80296c79>] __blkdev_put+0x4f/0x11c
 [<ffffffff80274a77>] __fput+0xb1/0x176
 [<ffffffff802723cb>] filp_close+0x5d/0x65
 [<ffffffff8022ff6c>] put_files_struct+0x66/0xc4
 [<ffffffff802311f7>] do_exit+0x23a/0x639
 [<ffffffff8023745e>] __dequeue_signal+0x19/0x15a
 [<ffffffff8023165c>] do_group_exit+0x66/0x93
 [<ffffffff802392d8>] get_signal_to_deliver+0x2d5/0x2f2
 [<ffffffff8020b1a7>] do_notify_resume+0xac/0x7d3
 [<ffffffff8023ef10>] autoremove_wake_function+0x0/0x2e
 [<ffffffff802743f4>] vfs_read+0x11e/0x132
 [<ffffffff80274e18>] fget_light+0x19/0x8a
 [<ffffffff8020be54>] sysret_signal+0x1c/0x27
 [<ffffffff8020c0d7>] ptregscall_common+0x67/0xb0

I hope this information is useful.

  Neil
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