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Date: Fri, 18 May 2012 12:40:51 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: Rabin Vincent <rabin@....in> Cc: alan@...ux.intel.com, gregkh@...uxfoundation.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: Race in vt_event_wait() during suspend/resume On Fri, 18 May 2012 16:34:53 +0530 Rabin Vincent <rabin@....in> wrote: > pm_restore_console() is called from the suspend/resume path, > this calls vt_move_to_console(), which calls vt_event_wait(). > > There's a race in this path which causes the process > which requests the suspend to sleep indefinitely waiting > for an event which already happened: > > P1 P2 > vt_move_to_console() > set_console() > schedule_console_callback() > vt_waitactive() > check n == fg_console +1 > console_callback() > switch_screen() > vt_event_post() // no waiters > > vt_event_wait() // forever > > I think the following should fix it. Comments? > Looks right to me. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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