[Bug 105428] Kernel 4.14.20, i915: pipe B vblank wait timed out

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105428

--- Comment #13 from Peter Klotz <peter.klotz99 at gmail.com> ---
Hi Jani

It seems that in 4.16.8 the original "pipe B vblank wait timed out" error is no
longer reproducible. I am not 100% sure but I tried the scenarios that would
previously sometimes trigger the bug.

However I got this (never seen before) warning in the dmesg output:

[434226.016578] ------------[ cut here ]------------
[434226.016603] WARN_ON(i915_gem_object_has_pinned_pages(obj))
[434226.016681] WARNING: CPU: 0 PID: 16958 at
drivers/gpu/drm/i915/i915_gem.c:4668 __i915_gem_free_objects+0x2ad/0x2c0 [i915]
[434226.016682] Modules linked in: tun iTCO_wdt iTCO_vendor_support coretemp
kvm_intel kvm irqbypass i915 arc4 psmouse pcspkr uvcvideo iwldvm
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 mac80211 btusb btrtl btbcm
btintel videobuf2_common joydev bluetooth mousedev videodev input_leds iwlwifi
i2c_algo_bit snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
media ecdh_generic drm_kms_helper r852 snd_hda_intel cfg80211 sm_common nand
snd_hda_codec nand_ecc lpc_ich nand_bch r592 bch mtd memstick snd_hda_core
r8169 mii snd_hwdep drm shpchp snd_pcm snd_timer snd rtc_cmos intel_agp
asus_laptop intel_gtt syscopyarea sparse_keymap sysfillrect rfkill sysimgblt
agpgart soundcore battery fb_sys_fops ac evdev input_polldev mac_hid
acpi_cpufreq vboxnetadp(O) vboxpci(O) fuse vboxnetflt(O) vboxdrv(O)
[434226.016739]  loop sg crypto_user ip_tables x_tables ext4 crc32c_generic
crc16 mbcache jbd2 fscrypto dm_crypt cbc algif_skcipher af_alg hid_cherry
hid_generic usbhid hid dm_mod sr_mod cdrom sd_mod serio_raw atkbd libps2 ahci
libahci sdhci_pci uhci_hcd cqhci sdhci libata led_class firewire_ohci scsi_mod
mmc_core firewire_core crc_itu_t ehci_pci ehci_hcd usbcore usb_common i8042
serio
[434226.016776] CPU: 0 PID: 16958 Comm: kworker/0:1 Tainted: G           O    
4.16.8-1-ARCH #1
[434226.016777] Hardware name: ASUSTeK Computer Inc.         B50A              
 /B50A      , BIOS 212     10/09/2009
[434226.016805] Workqueue: events __i915_gem_free_work [i915]
[434226.016832] RIP: 0010:__i915_gem_free_objects+0x2ad/0x2c0 [i915]
[434226.016834] RSP: 0018:ffffa81e8405fe30 EFLAGS: 00010286
[434226.016836] RAX: 0000000000000000 RBX: ffff913eeb341e00 RCX:
0000000000000001
[434226.016837] RDX: 0000000080000001 RSI: 0000000000000092 RDI:
00000000ffffffff
[434226.016838] RBP: ffff913eeb341ef8 R08: ffffffffffcd35ac R09:
0000000000000593
[434226.016839] R10: ffffffffbf5dc720 R11: 0000000000000000 R12:
ffff913fb5520000
[434226.016841] R13: ffff913e82374f00 R14: ffff913fb5524098 R15:
ffff913fb5520070
[434226.016842] FS:  0000000000000000(0000) GS:ffff913fbfc00000(0000)
knlGS:0000000000000000
[434226.016844] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[434226.016845] CR2: 00003676fc9c6000 CR3: 0000000005f02000 CR4:
00000000000006f0
[434226.016846] Call Trace:
[434226.016878]  __i915_gem_free_work+0x62/0x90 [i915]
[434226.016884]  process_one_work+0x1d1/0x3b0
[434226.016887]  worker_thread+0x2b/0x3d0
[434226.016889]  ? process_one_work+0x3b0/0x3b0
[434226.016891]  kthread+0x112/0x130
[434226.016893]  ? kthread_create_on_node+0x60/0x60
[434226.016896]  ? do_syscall_64+0x74/0x190
[434226.016899]  ? SyS_exit+0x13/0x20
[434226.016901]  ret_from_fork+0x35/0x40
[434226.016904] Code: e7 65 ff 0d e6 29 16 3f 0f 85 d3 fd ff ff e8 a0 fc 14 fd
e9 c9 fd ff ff 48 c7 c6 d0 af f9 c0 48 c7 c7 09 bd f8 c0 e8 7d 84 1c fd <0f> 0b
c7 83 c8 01 00 00 00 00 00 00 e9 7b fe ff ff 66 90 66 66 
[434226.016942] ---[ end trace 41cebd42bf16ce99 ]---

Looks like Bug #105360.

Is there a possibility to backport the fix for the original issue to LTS kernel
4.14?

Regards, Peter

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