linux-kernel - Re: PROBLEM: FUSE unmount breaks serial terminal line

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Message-ID: <20060822174329.GA6293@sommrey.de>
Date:	Tue, 22 Aug 2006 19:43:29 +0200
From:	Joerg Sommrey <jo@...mrey.de>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: FUSE unmount breaks serial terminal line

On Tue, Aug 22, 2006 at 06:07:24PM +0200, Miklos Szeredi wrote:
> > Tested both gphoto2 and gtkam without any problems. There is no impact
> > on the serial lines.
> > 
> > NB: The *real* trouble I have is with ntpd and a reference clock
> > attached to /dev/ttyS1.  ntpd enters a busy loop reading ttyS1, stops
> > working and eats up 100% CPU.  
> > 
> > Thanks for your investigations.  Any other idea?
> 
> Try 'killall -9 gphotofs' and then the 'fusermount -u'.
> 
> Does that have the same effect?  If so, after which does the serial
> line die?

Here are the results and another insight:  only the first serial device
open for reading is affected.  I.e. if ttyS0 is open for reading,
ttyS1 doesn't break.  If ttyS0 is not open, then ttyS1 breaks.  This
happens when gphotofs gets killed (or with fusermount -u without
killing).

-jo

-- 
-rw-r--r-- 1 jo users 62 2006-08-22 19:05 /home/jo/.signature
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