linux-kernel - Re: [PATCH] net: pktgen: don't abuse current->state in pktgen_thread

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Message-ID: <20150804164056.GA2758@localhost.localdomain>
Date:	Tue, 4 Aug 2015 13:40:56 -0300
From:	Marcelo Ricardo Leitner <mleitner@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Huang Ying <ying.huang@...el.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Jan Stancek <jstancek@...hat.com>,
	Jesper Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: pktgen: don't abuse current->state in
 pktgen_thread_worker()

On Tue, Aug 04, 2015 at 06:33:34PM +0200, Oleg Nesterov wrote:
> Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
> code in pktgen_thread_worker()" removed (in particular) the final
> __set_current_state(TASK_RUNNING) and I didn't notice the previous
> set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
> in __might_sleep() after return.
> 
> Afaics, we can simply remove both set_current_state()'s, and we
> could do this a long ago right after ef87979c273a2 "pktgen: better
> scheduler friendliness" which changed pktgen_thread_worker() to
> use wait_event_interruptible_timeout().
> 
> Reported-by: Huang Ying <ying.huang@...el.com>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Interesting that it didn't happen in my tests yet per description it
should have. Huang, did you do anything special to trigger this?

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