Hi!
> > > [ 116.733327] PM: suspend-to-disk mode set to 'shutdown' [
> > > 116.738849] swsusp: Basic memory bitmaps created [ 116.745353]
> > > Stopping tasks ... WARNING: at
> > > /home/devel/linux-git/kernel/lockdep.c:2414 check_flags()
>
> > > [ 116.755052] irq event stamp: 69
> > > [ 116.755060] hardirqs last enabled at (69): [<c04040f9>] syscall_exit_work+0x11/0x26
> > > [ 116.755084] hardirqs last disabled at (68): [<c0403fdd>] syscall_exit+0x9/0x1a
> > > [ 116.755109] softirqs last enabled at (0): [<c042150c>] copy_process+0x4dd/0x1286
> > > [ 116.755139] softirqs last disabled at (0): [<00000000>] 0x0
> > > [ 116.945776] done.
>
> > Well, it's harmless in the sense that "yeah, the system still works",
> > but it does seem to be a real bug. We have hardware interrupts
> > disabled when we _think_ we should have them on, so our irq tracking
> > is off.
> >
> > Ingo, do you see what's up? It looks like we got a signal to a process
> > that just got created, is the setup stuff for "tsk->hardirqs_enabled"
> > perhaps off a bit?
>
> hm. I cannot see the source of the bug at the moment, but here's my
> analysis so far:
>
> the last event that irqtrace got was #69, and that was a 'hardirqs on'
> in syscall_exit_work. After that we did a 'hardirqs off' without
> properly tracking that via irqtrace. Next time we got an irqtrace event
> (event 70) the assert caught up with us and turned off lockdep and
> backed out of that function. This was in:
>
> > [ 116.754957] [<c043c3e5>] check_flags+0x95/0x143
> > [ 116.754967] [<c043f158>] lock_acquire+0x29/0x82
> > [ 116.754977] [<c06313a7>] _spin_lock+0x35/0x42
> > [ 116.754990] [<c044894a>] refrigerator+0x14/0xc6
> > [ 116.755002] [<c042d4b3>] get_signal_to_deliver+0x33/0x397
> > [ 116.755016] [<c0403597>] do_notify_resume+0x94/0x6ed
> > [ 116.755029] [<c0404099>] work_notifysig+0x13/0x1a
>
> isnt the refrigerator() suspend related? Perhaps suspend disables irqs
> somewhere that we forgot to track?
refrigerator is suspend related, but I do not think it does any
interrupt magic. We do magic later in hibernation process.
This is in kernel/power/process.c, we have spinlock_irqsave there, but
that's pretty much it AFAICT.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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