linux-kernel - Re: __trace_remove_event_dirs() leaks file->filter ? (Was: probe_event_disable()->synchronize

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Date:	Fri, 04 Jul 2014 14:21:34 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: __trace_remove_event_dirs() leaks file->filter ? (Was: probe_event_disable()->synchronize_sched())

(2014/07/04 2:01), Oleg Nesterov wrote:
> On 07/03, Oleg Nesterov wrote:
>>
>> Hmm. Off-topic, but it seems that instance_rmdir() leaks the memory? Say,
>> file->filter?
> 
> Perhaps I am totally confused, but don't we need something like the patch
> below? I'll try to recheck later...
> 
> Better yet, we can probably move destroy_preds() from event_remove() to
> remove_event_file_dir()... not sure, need to recheck.

Ah, yes, it seems event_remove releases preds, and remove_event_file_dir()
called from event_trace_del_tracer() doesn't release it.

BTW, with following patch, we'd better remove destroy_preds() from
event_remove() and add destroy_call_preds() at the very last of the
function.

Thank you,

> 
> Oleg.
> 
> --- x/kernel/trace/trace_events.c
> +++ x/kernel/trace/trace_events.c
> @@ -470,6 +470,7 @@ static void remove_event_file_dir(struct ftrace_event_file *file)
>  
>  	list_del(&file->list);
>  	remove_subsystem(file->system);
> +	destroy_file_preds(file);
>  	kmem_cache_free(file_cachep, file);
>  }
>  
> 
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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