Re: [Intel-gfx] [-next] WARNING at i915_gem_track_fb

From: Daniel Vetter <daniel@ffwll.ch>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: Re: [Intel-gfx] [-next] WARNING at i915_gem_track_fb
Date: Mon, 13 Jul 2015 17:05:06 +0200	[thread overview]
Message-ID: <20150713150506.GW3736@phenom.ffwll.local> (raw)
In-Reply-To: <20150713144415.GA27052@swordfish>

On Mon, Jul 13, 2015 at 11:44:15PM +0900, Sergey Senozhatsky wrote:
> On (07/13/15 16:35), Daniel Vetter wrote:
> > On Mon, Jul 13, 2015 at 09:51:39PM +0900, Sergey Senozhatsky wrote:
> > > 4.2.0-rc2-next-20150713
> > 
> > Is this also an issue in the 4.2-rc series or only in -next?
> 
> don't know how to reproduce this, but I'll check.

It goes boom somewhere from the cursor ioctl code, which means X is
probably involved. Usual suspects are vt-switching, suspend/resume or
cursor vs. DPMS. You can force a DPMS off from within X with

$ xset dpms force off

For suspend resume it occasionally matters whether you initiate it through
the gui or by closing the lid or through timeout (if you're not connected
to a wallplug). I hope this helps with figuring out a repro recipe.

It could also be a race somewhere, in which case you won't be able to
consistently reproduce this.
-Daniel

> 
> 	-ss
> 
> > > 
> > > [ 1239.783862] ------------[ cut here ]------------
> > > [ 1239.783892] WARNING: CPU: 0 PID: 364 at drivers/gpu/drm/i915/i915_gem.c:5368 i915_gem_track_fb+0xdc/0x106 [i915]()
> > > [ 1239.783894] WARN_ON(new->frontbuffer_bits & frontbuffer_bits)
> > > [ 1239.783895] Modules linked in:
> > > [ 1239.783897]  zram lz4_decompress lz4_compress lzo_compress lzo_decompress zsmalloc sha256_ssse3 sha256_generic hmac drbg ctr ccm mousedev arc4 nls_iso8859_1 nls_cp437 vfat fat coretemp hwmon iwlmvm i915 mac80211 cfbfillrect cfbimgblt intel_powerclamp i2c_algo_bit crc32c_intel iwlwifi i2c_i801 serio_raw cfbcopyarea psmouse drm_kms_helper ie31200_edac cfg80211 lpc_ich r8169 atkbd mfd_core mii thermal drm edac_core libps2 mxm_wmi wmi i8042 evdev video serio backlight processor ext4 crc16 mbcache jbd2 sd_mod ehci_pci ehci_hcd ahci libahci libata xhci_pci xhci_hcd scsi_mod usbcore usb_common
> > > [ 1239.783942] CPU: 0 PID: 364 Comm: Xorg Not tainted 4.2.0-rc2-next-20150713-dbg-00017-g16b87ed-dirty #183
> > > [ 1239.783944]  0000000000000009 ffff88041c5379d8 ffffffff813a19ac ffffffff81077163
> > > [ 1239.783947]  ffff88041c537a28 ffff88041c537a18 ffffffff8103b5d9 ffff88041c5379f8
> > > [ 1239.783950]  ffffffffa0533273 0000000000000002 ffff88041c578000 ffff88041c578000
> > > [ 1239.783953] Call Trace:
> > > [ 1239.783961]  [<ffffffff813a19ac>] dump_stack+0x4c/0x65
> > > [ 1239.783965]  [<ffffffff81077163>] ? up+0x39/0x3e
> > > [ 1239.783968]  [<ffffffff8103b5d9>] warn_slowpath_common+0x9b/0xb5
> > > [ 1239.783986]  [<ffffffffa0533273>] ? i915_gem_track_fb+0xdc/0x106 [i915]
> > > [ 1239.783987]  [<ffffffff8103b639>] warn_slowpath_fmt+0x46/0x48
> > > [ 1239.784002]  [<ffffffffa0533273>] i915_gem_track_fb+0xdc/0x106 [i915]
> > > [ 1239.784026]  [<ffffffffa0575928>] intel_prepare_plane_fb+0xb1/0x101 [i915]
> > > [ 1239.784033]  [<ffffffffa0261f0f>] drm_atomic_helper_prepare_planes+0x5b/0xb8 [drm_kms_helper]
> > > [ 1239.784055]  [<ffffffffa0585596>] intel_atomic_commit+0x46/0xc0 [i915]
> > > [ 1239.784072]  [<ffffffffa02d2139>] drm_atomic_commit+0x4d/0x52 [drm]
> > > [ 1239.784078]  [<ffffffffa0262f32>] drm_atomic_helper_update_plane+0xca/0x119 [drm_kms_helper]
> > > [ 1239.784092]  [<ffffffffa02c7572>] __setplane_internal+0x24e/0x2ae [drm]
> > > [ 1239.784103]  [<ffffffffa02c771b>] drm_mode_cursor_universal+0x149/0x197 [drm]
> > > [ 1239.784113]  [<ffffffffa02c7e58>] ? drm_mode_setcrtc+0x428/0x428 [drm]
> > > [ 1239.784122]  [<ffffffffa02c781e>] drm_mode_cursor_common+0xb5/0x156 [drm]
> > > [ 1239.784132]  [<ffffffffa02c7e8f>] drm_mode_cursor_ioctl+0x37/0x39 [drm]
> > > [ 1239.784140]  [<ffffffffa02bae85>] drm_ioctl+0x287/0x415 [drm]
> > > [ 1239.784143]  [<ffffffff81078580>] ? __lock_is_held+0x3c/0x57
> > > [ 1239.784146]  [<ffffffff8114c3d1>] ? __fget+0x170/0x1a1
> > > [ 1239.784148]  [<ffffffff811422c1>] do_vfs_ioctl+0x455/0x4dd
> > > [ 1239.784151]  [<ffffffff8114c48e>] ? __fget_light+0x65/0x75
> > > [ 1239.784153]  [<ffffffff8114238d>] SyS_ioctl+0x44/0x63
> > > [ 1239.784155]  [<ffffffff813a8057>] entry_SYSCALL_64_fastpath+0x12/0x6f
> > > [ 1239.784157] ---[ end trace 67b32b389e7fe7df ]---
> > > 
> > > 	-ss
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > 
> > -- 
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
> > 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch