Nouveau - Jun 2014 - [Bug 80627] New: [NVE6] 'HUB_INIT timed out' 'Watchdog detected hard LOCKUP on cpu 7'

https://bugs.freedesktop.org/show_bug.cgi?id=80627

          Priority: medium
            Bug ID: 80627
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NVE6] 'HUB_INIT timed out' 'Watchdog detected
hard
                    LOCKUP on cpu 7'
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: zack at buhman.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 101915
  --> https://bugs.freedesktop.org/attachment.cgi?id=101915&action=edit
linux 3.15.1

On kernels after ~3.14, some time after nouveau fails to initialize
(<60 seconds) ~all of userland becomes mostly unreponsive (cpu time
preemption?) [dmesg1]. The 'unresponsive' behavior starts
at around the same time 56.740245 happens.

I bisected, and found the first commit where this happens is
1f1ac3bf2a804911ad46076b10ce15364237a698. Removing this commit causes
the previous behavior: initialization fails as usual but nothing else
interesting happens.

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--- Comment #1 from buhman <zack at buhman.org> ---
Created attachment 101916
  --> https://bugs.freedesktop.org/attachment.cgi?id=101916&action=edit
linux-3.16-rc2+ and darktama/nouveau at 6dd425510

I observed behavior similar/identical to the former on linux
3.16-rc + darktama/nouveau at 6dd425510 [dmesg2].

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--- Comment #2 from buhman <zack at buhman.org> ---
I submitted an mmiotrace from nvidia-340.17 to mmio.dumps (module
load, X startup, glxgears, X shutdown) with subject "bug 80627".

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--- Comment #3 from buhman <zack at buhman.org> ---
The ioread32 craziness vanished on or before darktama/nouveau @ 19ae6962 and
kernel 3.17-mw.

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buhman <zack at buhman.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #4 from buhman <zack at buhman.org> ---
The remaining issue is already discussed in bug 70354.

*** This bug has been marked as a duplicate of bug 70354 ***

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