linux-kernel - Re: console problem?, close(2) hangs /sbin/init

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Message-ID: <alpine.LNX.2.00.1101222312560.7746@swampdragon.chaosbits.net>
Date:	Sat, 22 Jan 2011 23:14:15 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	John Linn <John.Linn@...inx.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: console problem?, close(2) hangs /sbin/init

On Sat, 22 Jan 2011, John Linn wrote:

> I have a kernel that runs fine 

What kernel exactely?

>with a busybox root file system using
> inittab.  When I move to a non-busybox init (sysvinit), I see init
> hanging when doing a close of standard error very early when it starts.
> I have debugged it with GDB but not found the source of the hang as it's
> in the kernel it appears.
> 
> To debug this, I use init=/bin/sh on the kernel command line, then exec
> init to start it. The same root file system works on another board with
> a different kernel. 

What other kernel version exactely?

> I have also noticed that building init with
> INITDEBUG on so that it forks for debugging makes it work fine. This
> seems to indicate the device nodes are all fine to me.
> 
> It seems related to PID 1 and the console device.
> 
> Adding debug to the kernel in sys_close() shows it hanging in
> filp_close() and I'm still digging more (maybe locking issue). The
> console is a serial device with a newer driver which I suspected to be
> the issue, but can't see anything wrong.
> 
> Any hints or similar problems seen would be much appreciated.
> Thanks,
> John
> 

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
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