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Date: Mon, 12 May 2003 09:20:21 +0100
From: Russell King <rmk@arm.linux.org.uk>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Bernhard Kaindl <bernhard.kaindl@gmx.de>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Problem: strace -ff fails on 2.4.21-rc1
Message-ID: <20030512092020.A10073@flint.arm.linux.org.uk>
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On Sun, May 11, 2003 at 09:03:12PM -0400, Chuck Ebbert wrote:
> Proc;  minicom
> >>EIP; c01183a1 <schedule+351/3b0>   <===== ignore this bogus address
> Trace; c0122f24 <schedule_timeout+14/a0>
> Trace; c0134a31 <__alloc_pages+41/170>
> Trace; c021195b <tty_wait_until_sent+9b/e0>
> Trace; c0220d79 <rs_close+129/1f0>
> Trace; c020d997 <release_dev+247/500>
> Trace; c011690d <do_page_fault+11d/43b>
> Trace; c020e01a <tty_release+2a/60>
> Trace; c013c52e <fput+4e/100>
> Trace; c013b1d5 <filp_close+95/a0>
> Trace; c013b23b <sys_close+5b/70>
> Trace; c0108b73 <system_call+33/38>
> 
> It's hung up somewhere inside schedule().

Wait 30 seconds and see if it exits by itself.  I bet you have hardware
RTS/CTS handshaking enabled on the serial port, but without anything
connected.

When a port is closed, we wait up to 30 seconds (or a user specified time
period) for any characters in the transmit queue to be sent.  If CTS is
inactive and we're using RTS/CTS handshaking, we can't send any characters,
so we'll wait the full timeout.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html

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