linux-kernel - Re: [PATCH 2/3] tracing/stack-tracer: fix locking

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Message-ID: <20081123105211.GC30453@elte.hu>
Date:	Sun, 23 Nov 2008 11:52:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Török Edwin <edwintorok@...il.com>
Cc:	srostedt@...hat.com, a.p.zijlstra@...llo.nl, sandmann@...mi.au.dk,
	linux-kernel@...r.kernel.org, viro@...IV.linux.org.uk
Subject: Re: [PATCH 2/3] tracing/stack-tracer: fix locking


* Török Edwin <edwintorok@...il.com> wrote:

> +		down_read(&mm->mmap_sem);
> +		vma = find_vma(mm, ip);
>  		if (vma) {
>  			file = vma->vm_file;
>  			vmstart = vma->vm_start;
>  		}
> +		up_read(&mm->mmap_sem);
>  	}
>  	if (file) {
>  		ret = trace_seq_path(s, &file->f_path);

and now it's "file" that is held without a reference and possibly 
racy.

	Ingo
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