[Bug 94337] Linux 4.5 regression: FIFO underruns on Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94337

--- Comment #6 from Michele Lacchia <michelelacchia at gmail.com> ---
This is not fixed as of Linux 4.6.2-1-ARCH. Sometimes the bug causes my system
to completely freeze and I have to reboot with the power button. In journal I
see:

Jun 24 10:51:01 miki-laptop kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe A FIFO underrun

but the worse one is:

Jun 24 10:30:34 miki-laptop kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe A FIFO underrun
Jun 24 10:39:25 miki-laptop kernel: BUG: unable to handle kernel NULL pointer
dereference at           (null)
Jun 24 10:39:25 miki-laptop kernel: IP: [<          (null)>]           (null)
Jun 24 10:39:25 miki-laptop kernel: PGD 84d3e067 PUD 8523c067 PMD 0 
Jun 24 10:39:25 miki-laptop kernel: Oops: 0010 [#1] PREEMPT SMP 
Jun 24 10:39:25 miki-laptop kernel: Modules linked in: fuse sha256_ssse3
sha256_generic hmac drbg ansi_cprng ctr ccm uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_v4l2 videobuf2_core videodev
Jun 24 10:39:25 miki-laptop kernel:  glue_helper ablk_helper snd input_leds
cryptd cfg80211 led_class serio_raw pcspkr soundcore i2c_i801 hci_uart shpchp
btbcm i2c_hid thermal wmi btqca hid elan_i2c 
Jun 24 10:39:25 miki-laptop kernel:  drm_kms_helper syscopyarea sysfillrect
sysimgblt fb_sys_fops drm intel_agp intel_gtt
Jun 24 10:39:25 miki-laptop kernel: CPU: 0 PID: 765 Comm: Xorg Tainted: G     U
    O    4.6.2-1-ARCH #1
Jun 24 10:39:25 miki-laptop kernel: Hardware name: ASUSTeK COMPUTER INC.
UX305UA/UX305UA, BIOS UX305UA.201 10/12/2015
Jun 24 10:39:25 miki-laptop kernel: task: ffff8802692b0f40 ti: ffff880084d34000
task.ti: ffff880084d34000
Jun 24 10:39:25 miki-laptop kernel: RIP: 0010:[<0000000000000000>]  [<         
(null)>]           (null)
Jun 24 10:39:25 miki-laptop kernel: RSP: 0018:ffff880084d37af0  EFLAGS:
00010286
Jun 24 10:39:25 miki-laptop kernel: RAX: ffff880084d37bb8 RBX: ffff88026a1b5c00
RCX: 000000000001fd36
Jun 24 10:39:25 miki-laptop kernel: RDX: 000000000001fd36 RSI: ffff8802685220f8
RDI: ffff88026a1b5f00
Jun 24 10:39:25 miki-laptop kernel: RBP: ffff880084d37b78 R08: ffff88026a1b5f00
R09: ffff88026a1b5f00
Jun 24 10:39:25 miki-laptop kernel: R10: ffff88020a43ed00 R11: 0000000000000000
R12: 0000000000000001
Jun 24 10:39:25 miki-laptop kernel: R13: ffff880268523368 R14: ffff8802685220f8
R15: 0000000000000000
Jun 24 10:39:25 miki-laptop kernel: FS:  00007fb7671b8940(0000)
GS:ffff880273c00000(0000) knlGS:0000000000000000
Jun 24 10:39:25 miki-laptop kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jun 24 10:39:25 miki-laptop kernel: CR2: 0000000000000000 CR3: 000000007f387000
CR4: 00000000003406f0
Jun 24 10:39:25 miki-laptop kernel: Stack:
Jun 24 10:39:25 miki-laptop kernel:  ffffffffa0122da0 ffff880268520000
ffff8802685220f8 0001fd36000400d8
Jun 24 10:39:25 miki-laptop kernel:  ffff880084d37bb8 ffff8801cb6cf3c0
ffff88026a1b5c00 ffff880230579cc0
Jun 24 10:39:25 miki-laptop kernel:  ffff880084d37b40 ffffffffa0125ffd
ffff880084d37b80 00000000afcbbfb4
Jun 24 10:39:25 miki-laptop kernel: Call Trace:
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0122da0>] ?
i915_gem_object_sync+0x1b0/0x340 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0125ffd>] ?
i915_gem_object_pin+0x2d/0x30 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0135abd>]
intel_execlists_submission+0x1cd/0x440 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0114a20>]
i915_gem_do_execbuffer.isra.14+0xaf0/0x1450 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff812e6ae9>] ?
idr_get_empty_slot+0x189/0x370
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff812e6d53>] ?
idr_alloc+0x83/0x100
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0018079>] ?
drm_gem_handle_create_tail+0xc9/0x1a0 [drm]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa01160d4>]
i915_gem_execbuffer2+0xd4/0x250 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0018aa2>] drm_ioctl+0x152/0x540
[drm]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffffa0116000>] ?
i915_gem_execbuffer+0x330/0x330 [i915]
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff81209bc3>]
do_vfs_ioctl+0xa3/0x5d0
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff814a1091>] ?
__sys_recvmsg+0x51/0x90
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff8120a169>] SyS_ioctl+0x79/0x90
Jun 24 10:39:25 miki-laptop kernel:  [<ffffffff815c7272>]
entry_SYSCALL_64_fastpath+0x1a/0xa4
Jun 24 10:39:25 miki-laptop kernel: Code:  Bad RIP value.
Jun 24 10:39:25 miki-laptop kernel: RIP  [<          (null)>]           (null)
Jun 24 10:39:25 miki-laptop kernel:  RSP <ffff880084d37af0>
Jun 24 10:39:25 miki-laptop kernel: CR2: 0000000000000000
Jun 24 10:39:25 miki-laptop kernel: ---[ end trace 946c0a8763286b97 ]---
Jun 24 10:39:25 miki-laptop org.a11y.atspi.Registry[5911]: XIO:  fatal IO error
11 (Resource temporarily unavailable) on X server :0
Jun 24 10:39:25 miki-laptop org.a11y.atspi.Registry[5911]:       after 2113
requests (2113 known processed) with 0 events remaining.
-- Reboot --

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