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From: Tony Mantler <nicoya@ubb.ca>
Subject: Re: CONFIG_MK6 = lsof hangs unkillable
Date: Mon, 16 Jan 2006 16:58:55 -0600
To: linux-kernel@vger.kernel.org
Sender: linux-kernel-owner@vger.kernel.org
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On 15-Jan-06, at 10:43 PM, Tony Mantler wrote:

> I'm having trouble running lsof on 2.6.15.1 when the kernel is  
> compiled with CONFIG_MK6. When run as root, lsof will segfault, and  
> when run as a user lsof will hang unkillable.
>
> The same kernel, same machine, but compiled with CONFIG_MK7 runs  
> just lsof just fine.

To follow up on this, it appears that things are getting stuck while  
reading /proc/*/maps, specifically it hangs in fs/proc/task_mmu.c in  
m_start() at down_read(&mm->mmap_sem). The same thing happens when  
trying to readlink /proc/*/exe.

I'm really not sure why this lock is getting stuck. Can anyone  
reproduce this?

--
Tony 'Nicoya' Mantler -- Master of Code-fu -- nicoya@ubb.ca
--  http://nicoya.feline.pp.se/  --  http://www.ubb.ca/  --

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