Messages in this thread | | | Date | Sat, 15 Feb 2014 15:22:51 +0000 | From | Al Viro <> | Subject | Re: 3.14-rc2 XFS backtrace because irqs_disabled. |
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On Sat, Feb 15, 2014 at 03:27:00PM +0100, Oleg Nesterov wrote:
> 1. info->q can be already freed if SIGQUEUE_PREALLOC. > > Once get_signal_to_deliver() or any other caller drops ->siglock > another thread can do sys_timer_delete()->sigqueue_free().
How the devil would it find the sucker? It's off the list already.
> 2. We need to move do_schedule_next_timer() from dequeue_signal() > here. > > Otherwise ->q can be reused/overwritten by the next send_sigqueue() > right affter ->siglock is dropped.
Ditto. We rip them out of queue on collect_signal(); the only thing we do not do is actual __sigqueue_free().
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