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SubjectRe: 2.6.34-rc2: "ima_dec_counts: open/free imbalance"?
On Wed, Mar 31, 2010 at 04:32:34PM -0700, Andrew Morton wrote:
> On Sun, 28 Mar 2010 13:31:49 +0200
> Thomas Meyer <thomas@m3y3r.de> wrote:
>
> > This warning/error/notice is new in 2.6.34-rc2+:
>
> Let's add some cc's. It might be a DRM bug.
>
> I'll ask Rafael and Maciej to track this as a post-2.6.33 regression,
> thanks.

I myself and a few testers have hit another strange inconsistency in the
gem shm handling code which might be related (some internal refcount that
gets out-of-sync and no refcount imbalances in the code). Unfortunately I
can't reproduce it anymore and I currently don't yet have a clue about
what's wrong. Currently I'm suspecting a locking goof-up.

Is there a bugzilla entry to track this?
-Daniel

> > [ 1878.810147] PM: Syncing filesystems ... done.
> > [ 1878.903316] Freezing user space processes ... (elapsed 0.01 seconds) done.
> > [ 1878.916589] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
> > [ 1878.929866] Suspending console(s) (use no_console_suspend to debug)
> > [ 1878.930229] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > [ 1878.930370] sd 0:0:0:0: [sda] Stopping disk
> > [ 1878.981086] atl1c 0000:01:00.0: PCI INT A disabled
> > [ 1878.981369] uhci_hcd 0000:00:1d.2: PCI INT D disabled
> > [ 1878.981379] uhci_hcd 0000:00:1d.1: PCI INT B disabled
> > [ 1878.981389] uhci_hcd 0000:00:1d.0: PCI INT A disabled
> > [ 1878.981454] HDA Intel 0000:00:1b.0: PCI INT A disabled
> > [ 1878.981500] ACPI handle has no context!
> > [ 1878.981529] ehci_hcd 0000:00:1a.7: PCI INT D disabled
> > [ 1878.981540] uhci_hcd 0000:00:1a.0: PCI INT A disabled
> > [ 1878.981602] IMA: unmeasured files on fsmagic: 1021994
> > [ 1878.981605] ima_dec_counts: open/free imbalance (r:0 w:-1 o:-1)
> > [ 1878.981609] Pid: 4888, comm: async/10 Tainted: G W 2.6.34-rc2 #88
> > [ 1878.981612] Call Trace:
> > [ 1878.981620] [<c0886ac2>] ? printk+0x1d/0x23
> > [ 1878.981627] [<c05f966f>] ima_file_free+0x16f/0x210
> > [ 1878.981632] [<c04d7132>] __fput+0xf2/0x1f0
> > [ 1878.981636] [<c04d724d>] fput+0x1d/0x30
> > [ 1878.981641] [<c06cbd2f>] drm_gem_object_free_common+0x1f/0x40
> > [ 1878.981645] [<c06cbdd0>] ? drm_gem_object_free+0x0/0x40
> > [ 1878.981649] [<c06cbe01>] drm_gem_object_free+0x31/0x40
> > [ 1878.981653] [<c061d20c>] kref_put+0x2c/0x60
> > [ 1878.981658] [<c06e8078>] i915_gem_cleanup_ringbuffer+0x48/0x70
> > [ 1878.981662] [<c06e97ec>] i915_gem_idle+0x9c/0x120
> > [ 1878.981666] [<c06dcefd>] i915_drm_freeze+0x3d/0xa0
> > [ 1878.981670] [<c06dd01e>] i915_pm_suspend+0x2e/0x80
> > [ 1878.981674] [<c08871ca>] ? wait_for_common+0x1a/0x100
> > [ 1878.981679] [<c0636269>] pci_pm_suspend+0x49/0x110
> > [ 1878.981682] [<c0636220>] ? pci_pm_suspend+0x0/0x110
> > [ 1878.981687] [<c07194f1>] pm_op+0x181/0x1d0
> > [ 1878.981691] [<c07126f4>] ? device_for_each_child+0x54/0x60
> > [ 1878.981695] [<c0719eaf>] __device_suspend+0xbf/0x110
> > [ 1878.981699] [<c071a2f3>] async_suspend+0x23/0x60
> > [ 1878.981703] [<c044ff25>] async_thread+0xc5/0x210
> > [ 1878.981707] [<c0886e31>] ? schedule+0x1e1/0x450
> > [ 1878.981713] [<c042c030>] ? default_wake_function+0x0/0x20
> > [ 1878.981716] [<c044fe60>] ? async_thread+0x0/0x210
> > [ 1878.981720] [<c0449254>] kthread+0x74/0x80
> > [ 1878.981724] [<c04491e0>] ? kthread+0x0/0x80
> > [ 1878.981728] [<c04034be>] kernel_thread_helper+0x6/0x10
> > [ 1878.986489] iint_free: writecount: -1
> > [ 1878.986492] iint_free: opencount: -1
> > [ 1878.986494] iint_free: writecount: -1
> > [ 1878.986496] iint_free: opencount: -1
> > [ 1878.993205] ehci_hcd 0000:00:1d.7: PCI INT A disabled
> > [ 1879.649836] PM: suspend of devices complete after 719.812 msecs
> > [ 1879.676555] PM: late suspend of devices complete after 26.714 msecs
> > [ 1879.677144] ACPI: Preparing to enter system sleep state S3
> > [ 1879.677144] Back to C!
> >
> > Does anybody care?
> >
> > mfg
> > thomas
--
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48


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