linux-kernel - Re: [PATCH] fs/proc: Move kfree outside pde_unload

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Message-ID: <1346213517.2522.2.camel@edumazet-glaptop>
Date:	Tue, 28 Aug 2012 21:11:57 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Nathan Zimmer <nzimmer@....com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] fs/proc: Move kfree outside pde_unload_lock

On Tue, 2012-08-28 at 23:38 +0300, Alexey Dobriyan wrote:

> Nothing can stop RCU!
> 
> After running "modprobe;rmmod" in a loop and "cat" in another loop for a while
> rmmod got stuck in D-state inside remove_proc_entry() with trace amounts of CPU time
> being consumed.
> 
> It didn't oopsed, though.

Thanks ! 

I'll polish this patch once LKS/LPC is over...

What particular module and/or proc file did you use for your tests ?



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