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Subjecttty related hangs with 2.6.31-rc3

I am finding tty related hangs with 2.6.31-rc3. This didn't happen
before. This happen when i close the emacs session. The /proc/<pid>/stack
content is below

[<c0362c5b>] process_echoes+0x2b/0x2e0
[<c03638cb>] n_tty_write_wakeup+0xb/0x40
[<c0360a88>] tty_wakeup+0x58/0x70
[<c0368347>] pty_write+0x67/0x70
[<c035f1cb>] tty_put_char+0x2b/0x40
[<c036291f>] do_output_char+0xef/0x200
[<c0362d4e>] process_echoes+0x11e/0x2e0
[<c0364292>] n_tty_receive_char+0x102/0x710
[<c0364ac0>] n_tty_receive_buf+0x220/0x410
[<c036059c>] tiocsti+0x8c/0xa0
[<c0361aca>] tty_ioctl+0x25a/0x310
[<c01e52c8>] vfs_ioctl+0x28/0x80
[<c01e54f4>] do_vfs_ioctl+0x64/0x1c0
[<c01e56a3>] sys_ioctl+0x53/0x70
[<c0102e3c>] sysenter_do_call+0x12/0x28
[<ffffffff>] 0xffffffff


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