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From: "홍신 shin hong" <hongshin@gmail.com>
To: linux-mmc@vger.kernel.org
Subject: BUG? a suspected race bug at sdio_irq_thread()
Date: Mon, 7 Sep 2009 19:15:37 +0900	[thread overview]
Message-ID: <2014bcab0909070315j67c5db31gff6bc70f0b6369a5@mail.gmail.com> (raw)
In-Reply-To: <2014bcab0909022048n2c937af4l5bd38c501469b1c7@mail.gmail.com>

Hello. I am reporting a suspected race bug at sdio_irq_thread()
in drivers/mmc/core/sdio_irq.c of Linux 2.6.30.5.

I hope this report is helpful. I am not certain whether this reports
real bug or not since I do not have much background.
So, please examine the report and let me know your opinion.

sdio_irq_therad() is spawned as a sdio_card_irq_get().
This thread is stopped by sdio_card_irq_put().

sdio_irq_thread() finishes its do-while iteration
when kthread_should_stop() returns true
or a condition is satisfied (break statements at line 106)

For the later case, if sdio_irq_thread() is finished
before kthread_should_stop() returns false.

In that situation, if other thread invokes kthread_stop(),
the caller of kthread_stop() might have a problem (waiting indefinitely).

Could you examine the possibility of this type of errors please?

Thank you

Sincerely
Shin Hong

       reply	other threads:[~2009-09-07 10:15 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <2014bcab0909022048n2c937af4l5bd38c501469b1c7@mail.gmail.com>
2009-09-07 10:15 ` 홍신 shin hong [this message]
2009-09-08  2:30   ` BUG? a suspected race bug at sdio_irq_thread() Nicolas Pitre

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