linux-kernel - Re: Leaks in trace reported by kmemleak

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Message-ID: <4AD6EF65.6080602@cn.fujitsu.com>
Date:	Thu, 15 Oct 2009 17:46:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Zdenek Kabelac <zdenek.kabelac@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Leaks in trace reported by kmemleak

CC: ...

Zdenek Kabelac wrote:
> I've noticed your latest patch for memory leak in filter setting
> (8ad807318fcd...) - but even with this patch - kmemleak seems to still
> report  lots  (~900) of following leaks - note - they come only from
> i915 and kvm module - so I'm not sure if these two modules are doing
> something wrong or the problem is in trace code.
> 
> It looks like whole directory is somehow forgotten.
> 

Fortunately those are false-positives:

 # modprobe i915
 # echo scan > /debug/kmemleak
 # cat /debug/kmemleak
 (lots of "leaks")
 # rmmod i915
 # echo scan > /debug/kmemleak
 # cat /debug/kmemleak
 (no leaks)

All the memory allocated when loading the module is
freed in trace_module_remove_events() at module unload.

But I haven't looked into how to suppress those false-postives.
I'd like to, but I'm going to leave my office and won't be
back until 26th..

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