On Mon, Oct 27, 2014 at 09:47:57AM -0400, Eric B Munson wrote:
> On Fri, 24 Oct 2014, Paul E. McKenney wrote:
>
> > On Fri, Oct 24, 2014 at 02:40:28PM -0400, Eric B Munson wrote:
> > > On Fri, 24 Oct 2014, Paul E. McKenney wrote:
> > >
> > > > On Fri, Oct 24, 2014 at 12:36:12PM -0400, Eric B Munson wrote:
> > > > > On Fri, 24 Oct 2014, Paul E. McKenney wrote:
> > > > >
> > > > > > On Fri, Oct 24, 2014 at 12:08:15PM -0400, Eric B Munson wrote:
> > > > > > > Paul,
> > > > > > >
> > > > > > > As of 3.18-rc1 I can no longer hibernate my Dell XPS-13. Bisect
> > > > > > > points
> > > > > > > the finger at 35ce7f29a. A revert of that commit confirms, I can
> > > > > > > once
> > > > > > > again hibernate my machine without it.
> > > > > > >
> > > > > > > When the hibernation fails I see this in dmesg:
> > > > > > > [ 37.953313] PM: Syncing filesystems ... done.
> > > > > > > [ 37.963694] Freezing user space processes ... (elapsed 0.001
> > > > > > > seconds) done.
> > > > > > > [ 37.965297] PM: Marking nosave pages: [mem
> > > > > > > 0x00000000-0x00000fff]
> > > > > > > [ 37.965299] PM: Marking nosave pages: [mem
> > > > > > > 0x00058000-0x00058fff]
> > > > > > > [ 37.965301] PM: Marking nosave pages: [mem
> > > > > > > 0x0009d000-0x000fffff]
> > > > > > > [ 37.965304] PM: Marking nosave pages: [mem
> > > > > > > 0xc496a000-0xc4b6bfff]
> > > > > > > [ 37.965315] PM: Marking nosave pages: [mem
> > > > > > > 0xdadb7000-0xdcffefff]
> > > > > > > [ 37.965479] PM: Marking nosave pages: [mem
> > > > > > > 0xdd000000-0xffffffff]
> > > > > > > [ 37.966000] PM: Basic memory bitmaps created
> > > > > > > [ 37.966046] PM: Preallocating image memory... done (allocated
> > > > > > > 181989 pages)
> > > > > > > [ 38.141524] PM: Allocated 727956 kbytes in 0.17 seconds
> > > > > > > (4282.09 MB/s)
> > > > > > > [ 38.141525] Freezing remaining freezable tasks ...
> > > > > > > [ 58.151863] Freezing of tasks failed after 20.004 seconds (0
> > > > > > > tasks refusing to freeze, wq_busy=1):
> > > > > > > [ 58.151894]
> > > > > > > [ 58.151896] Restarting kernel threads ... done.
> > > > > > > [ 58.181915] PM: Basic memory bitmaps freed
> > > > > > > [ 58.181917] Restarting tasks ... done.
> > > > > > >
> > > > > > >
> > > > > > > I am not sure what else I can provide that might be useful, but I
> > > > > > > did
> > > > > > > see the thread on net-dev about this same commit. Please CC me
> > > > > > > on any
> > > > > > > fixes and I will be happy to test.
> > > > > >
> > > > > > Thank you for the bug report!
> > > > > >
> > > > > > Does the following patch help?
> > > > > >
> > > > > > Thanx, Paul
> > > > >
> > > > > Paul,
> > > > >
> > > > > This patch does not help. I see the same dmesg output and failure to
> > > > > hibernate.
> > > >
> > > > Thank you for testing it. Does the following (untested, might not even
> > > > build) patch help? (Or feel free to wait until I have done some testing
> > > > on it.)
> > > >
> > > > Thanx, Paul
> > >
> > > Still didn't help. If it helps, when I attempt to reboot after trying
> > > to hibernate I see a kworker thread hung and get the stack trace below
> > > from that thread. I assume this is the same thread that is holding up
> > > the hibernate.
> >
> > Yep, looks like something that some other people are running into as well.
> >
> > If you turn off CONFIG_RCU_NOCB_CPU, do you still get the failure?
>
> Disabling CONFIG_RCU_NOCB_CPU fixes the problem. I am able to hibernate
> and resume successfully.
Very good! Then the fix I am working on might actually be a fix. ;-)
Thanx, Paul
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