Messages in this thread | | | Subject | Re: rcu: endless stalls | From | Mike Galbraith <> | Date | Mon, 11 Jun 2012 19:20:14 +0200 |
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On Mon, 2012-06-11 at 16:22 +0200, Mike Galbraith wrote: > On Mon, 2012-06-11 at 06:39 -0700, Paul E. McKenney wrote: > > On Mon, Jun 11, 2012 at 12:06:16PM +0200, Mike Galbraith wrote: > > > Greetings, > > > > > > I received a report of a 48 core UV box hitting a gripe, taking longer > > > than timeout to emit same, so box griped endlessly, forcing reboot. > > > > So it took minutes to print an RCU CPU stall warning? On only 48 CPUs? > > > > If so, yow!!! > > The report was a tad fuzzy on details, but serial console can take a > while at low baud rate, and the box was apparently perma-stalled.
Gee, no wonder it took a while to emit the gripe, there were a few more than 48 CPUs actually.. 4048 more to be precise.
4096 tasks on 4096 CPUs all hammering wait_lock at once r!pretty.
2aa15890 - mm: prevent concurrent unmap_mapping_range() on the same inode
-Mike
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