linux-kernel - Re: 2.6.34-rc2: "ima_dec_counts: open/free imbalance"?

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Date:	Mon, 12 Apr 2010 14:54:03 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Thomas Meyer <thomas@...3r.de>, Mimi Zohar <zohar@...ibm.com>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sourceforge.net
Subject: Re: 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@...3r.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@...ll.ch
Mobile: +41 (0)79 365 57 48
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