Re: [BUG] long freezes on thinkpad t60

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
From: Ingo Molnar
Date: Thursday, June 21, 2007 - 1:16 pm

* Linus Torvalds <torvalds@linux-foundation.org> wrote:


the freezes that Miklos was seeing were hardirq contexts blocking in 
task_rq_lock() - that is done with interrupts disabled. (Miklos i think 
also tried !NOHZ kernels and older kernels, with a similar result.)

plus on the ptrace side, the wait_task_inactive() code had most of its 
overhead in the atomic op, so if any timer IRQ hit _that_ core, it was 
likely while we were still holding the runqueue lock!

i think the only thing that eventually got Miklos' laptop out of the 
wedge were timer irqs hitting the ptrace CPU in exactly those 
instructions where it was not holding the runqueue lock. (or perhaps an 
asynchronous SMM event delaying it for a long time)

	Ingo
-
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
[BUG] long freezes on thinkpad t60, Miklos Szeredi, (Thu May 24, 5:04 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 5:54 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Thu May 24, 7:03 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 7:10 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Thu May 24, 7:28 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 7:42 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 7:44 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Thu May 24, 10:09 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 2:01 pm)
Re: [BUG] long freezes on thinkpad t60, Henrique de Moraes H ..., (Thu May 24, 3:08 pm)
Re: [BUG] long freezes on thinkpad t60, Kok, Auke, (Thu May 24, 3:13 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu May 24, 11:58 pm)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Fri May 25, 2:51 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Thu Jun 14, 9:04 am)
Re: [BUG] long freezes on thinkpad t60, Chuck Ebbert, (Fri Jun 15, 2:25 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Sat Jun 16, 3:37 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Sun Jun 17, 2:46 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Sun Jun 17, 11:43 pm)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 12:24 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 1:12 am)
Re: [BUG] long freezes on thinkpad t60, Andrew Morton, (Mon Jun 18, 1:20 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 1:25 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 1:31 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 1:34 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 2:18 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 2:38 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 2:44 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 3:18 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 5:36 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 6:10 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Mon Jun 18, 9:34 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Mon Jun 18, 10:41 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Mon Jun 18, 10:48 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 11:00 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Mon Jun 18, 11:02 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Mon Jun 18, 11:25 am)
Re: [BUG] long freezes on thinkpad t60, Ravikiran G Thirumalai, (Mon Jun 18, 9:22 pm)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Wed Jun 20, 2:36 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Wed Jun 20, 10:34 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 12:30 am)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Thu Jun 21, 12:38 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:39 am)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Thu Jun 21, 4:09 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 8:50 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 9:01 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 9:08 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 9:32 am)
Re: [BUG] long freezes on thinkpad t60, Chuck Ebbert, (Thu Jun 21, 9:44 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 10:31 am)
Re: [BUG] long freezes on thinkpad t60, Eric Dumazet, (Thu Jun 21, 11:29 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 11:44 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 12:35 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 12:56 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:09 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 1:10 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:12 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 1:14 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:16 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:18 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:23 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 1:30 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 1:36 pm)
Re: [BUG] long freezes on thinkpad t60, Eric Dumazet, (Thu Jun 21, 1:36 pm)
[patch] spinlock debug: make looping nicer, Ingo Molnar, (Thu Jun 21, 1:42 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Thu Jun 21, 1:48 pm)
Re: [patch] spinlock debug: make looping nicer, Linus Torvalds, (Thu Jun 21, 1:58 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Thu Jun 21, 2:06 pm)
Re: [patch] spinlock debug: make looping nicer, Ingo Molnar, (Thu Jun 21, 2:15 pm)
Re: [patch] spinlock debug: make looping nicer, Jarek Poplawski, (Fri Jun 22, 12:00 am)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Fri Jun 22, 1:17 am)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Fri Jun 22, 3:38 am)
Re: [BUG] long freezes on thinkpad t60, Miklos Szeredi, (Sat Jun 23, 3:36 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Sat Jun 23, 9:39 am)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Sun Jun 24, 11:45 pm)
Re: [BUG] long freezes on thinkpad t60, Nick Piggin, (Tue Jun 26, 1:42 am)
Re: [BUG] long freezes on thinkpad t60, Jarek Poplawski, (Tue Jun 26, 3:56 am)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Tue Jun 26, 10:23 am)
Re: [BUG] long freezes on thinkpad t60, Nick Piggin, (Tue Jun 26, 10:23 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Tue Jun 26, 11:04 pm)
Re: [BUG] long freezes on thinkpad t60, Nick Piggin, (Tue Jun 26, 11:20 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Wed Jun 27, 12:47 pm)
Re: [BUG] long freezes on thinkpad t60, Ingo Molnar, (Wed Jun 27, 1:10 pm)
Re: [BUG] long freezes on thinkpad t60, Davide Libenzi, (Wed Jun 27, 1:17 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Wed Jun 27, 3:11 pm)
Re: [BUG] long freezes on thinkpad t60, Davide Libenzi, (Wed Jun 27, 4:30 pm)
Re: [BUG] long freezes on thinkpad t60, Linus Torvalds, (Wed Jun 27, 5:46 pm)
Re: [BUG] long freezes on thinkpad t60, Davide Libenzi, (Wed Jun 27, 8:03 pm)
Re: [BUG] long freezes on thinkpad t60, Nick Piggin, (Mon Jul 2, 12:06 am)