Created attachment 141543 [details]
crash dump with mesa-18.1.7

Bug description:

The bug causes the display to freeze either temporarily or permanently (reboot necessary). If it freezes only temporarily, graphical glitches occur (blank windows, black rectangles, ...).

System environment:
-- chipset:

00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
06:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 07)

-- system architecture: 64-bit
-- xf86-video-intel: 2.99.917.831_3
-- xserver: 1.20.1_7
-- mesa: 18.2.0_1
-- libdrm: 2.4.94_1
-- kernel: 4.18.7_2
-- Linux distribution: Void Linux
-- Machine or mobo model: Dell Inspiron 5558 / Dell 08V6CK
-- Display connector:

Reproducing steps:

This seems to be very random. Sometimes it'll happen when nothing is happening on the system, other times when watching a video. I haven't been able to figure out how to reproduce it consistently.

Additional info:

I've attached two crash dumps (one with mesa-18.1.7, the other with mesa-18.2.0) and a system log of when the bug appears.