bash hanged on serial port

[gshan]

Hi All, When I'm booting my card while keeping connect to serial port, 
everything is ok.
However, when I issued "reboot" command and disconnect connection to 
serial port and
waited for several minutes, shell (bash) hanged. Finally I found it 
hanged in following line
of /etc/init.d/rc.

stty onlcr 0>&1

Then I replace this line in /etc/init.d/rc with "strace stty onlcr 0>&1" 
and got following cached
output. However sys_ioctl of kernel wasn't called ever.

brk(0x1003b000)                         = 0x1003b000
brk(0x1003c000)                         = 0x1003c000
ioctl(0, TCGETS, {B9600 opost isig icanon echo ...}) = 0
ioctl(0, TCGETS, {B9600 opost isig icanon echo ...}) = 0
ioctl(0, TCSETSW


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