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Date: Sat, 15 Feb 2014 19:45:31 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Al Viro <viro@...IV.linux.org.uk> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Dave Chinner <david@...morbit.com>, Dave Jones <davej@...hat.com>, Eric Sandeen <sandeen@...deen.net>, Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled. On 02/15, Al Viro wrote: > > On Sat, Feb 15, 2014 at 06:43:45PM +0100, Oleg Nesterov wrote: > > > So basically we want a different condition for "can we just go ahead and > > > free that sucker", right? Instead of "it's on the list, shan't free it" > > > it ought to be something like "it's on the list or it is referenced by > > > ksiginfo". Locking will be interesting, though... ;-/ > > > > I guess yes... send_sigqueue() checks list_empty() too, probably nobody else. > > The trouble being, we might end up with > Q picked by collect_signal and and stuff into ksiginfo > Q resubmitted by timer code In this case the timer code should simply inc ->si_overrun and do nothing. IOW, list_empty() should be turned into is_queued(), and is_queued() should be true until dismiss_siginfo() which should also do do_schedule_next_timer(). I think. Oleg. -- 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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