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Ubuntu 18.04 (bionic) reached end-of-standard-support on May 31, 2023.

I'm setting the status of this bug to 'Incomplete' as it's not seen any
activity for some time. If this is still an issue when using a currently
maintained release of Ubuntu then please let us know which one(s)
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** Changed in: mesa (Ubuntu)
       Status: New => Incomplete

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1890411

Title:
  [bionic] Xorg crashes when starting gdm3. Bug in libgl1-mesa-dri.

Status in mesa package in Ubuntu:
  Incomplete
Status in xorg-server package in Ubuntu:
  Incomplete

Bug description:
  When ubuntu starts up, gdm3 does not start due to a crash in the the
  xserver:

  [  1271.342] (II) SELinux: Disabled on system
  [  1271.346] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
  [  1271.346] (II) AIGLX: enabled GLX_ARB_create_context
  [  1271.346] (II) AIGLX: enabled GLX_ARB_create_context_profile
  [  1271.346] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile
  [  1271.346] (II) AIGLX: enabled GLX_INTEL_swap_event
  [  1271.346] (II) AIGLX: enabled GLX_SGI_swap_control
  [  1271.346] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
  [  1271.346] (II) AIGLX: enabled GLX_ARB_fbconfig_float
  [  1271.346] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float
  [  1271.346] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
  [  1271.346] (II) AIGLX: enabled GLX_ARB_create_context_robustness
  [  1271.346] (II) AIGLX: Loaded and initialized i965
  [  1271.346] (II) GLX: Initialized DRI2 GL provider for screen 0
  [  1271.348] (II) modeset(0): Damage tracking initialized
  [  1271.348] (II) modeset(0): Setting screen physical size to 508 x 317
  [  1271.352] (EE) 
  [  1271.352] (EE) Backtrace:
  [  1271.352] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x5649b579bacd]
  [  1271.352] (EE) 1: /usr/lib/xorg/Xorg (0x5649b55e3000+0x1bc869) 
[0x5649b579f869]
  [  1271.352] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 
(0x7f5c7d0a5000+0x128a0) [0x7f5c7d0b78a0]
  [  1271.352] (EE) 3: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x8e8652) [0x7f5c784e2652]
  [  1271.352] (EE) 4: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x8e877f) [0x7f5c784e277f]
  [  1271.352] (EE) 5: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x122916) [0x7f5c77d1c916]
  [  1271.352] (EE) 6: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x1189bc) [0x7f5c77d129bc]
  [  1271.352] (EE) 7: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x109c1b) [0x7f5c77d03c1b]
  [  1271.352] (EE) 8: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x279558) [0x7f5c77e73558]
  [  1271.352] (EE) 9: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 
(0x7f5c77bfa000+0x2796e3) [0x7f5c77e736e3]
  [  1271.352] (EE) 10: /usr/lib/xorg/modules/libglamoregl.so 
(0x7f5c79937000+0x1a1ab) [0x7f5c799511ab]
  [  1271.352] (EE) 11: /usr/lib/xorg/Xorg (0x5649b55e3000+0x13ed03) 
[0x5649b5721d03]
  [  1271.352] (EE) 12: /usr/lib/xorg/Xorg (miPaintWindow+0x22f) 
[0x5649b577fd1f]
  [  1271.352] (EE) 13: /usr/lib/xorg/Xorg (miWindowExposures+0x112) 
[0x5649b577fa62]
  [  1271.352] (EE) 14: /usr/lib/xorg/Xorg (0x5649b55e3000+0xa9c41) 
[0x5649b568cc41]
  [  1271.352] (EE) 15: /usr/lib/xorg/Xorg (MapWindow+0x114) [0x5649b5665d04]
  [  1271.352] (EE) 16: /usr/lib/xorg/Xorg (0x5649b55e3000+0x56e79) 
[0x5649b5639e79]
  [  1271.352] (EE) 17: /lib/x86_64-linux-gnu/libc.so.6 
(__libc_start_main+0xe7) [0x7f5c7ccd5b97]
  [  1271.352] (EE) 18: /usr/lib/xorg/Xorg (_start+0x2a) [0x5649b5623b8a]
  [  1271.352] (EE) 
  [  1271.352] (EE) Segmentation fault at address 0x4
  [  1271.352] (EE) 
  Fatal server error:
  [  1271.352] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [  1271.352] (EE) 
  [  1271.352] (EE) 

  As i965_dri.so is part of the libgl-mesa-dri package I downgraded this
  specific package from version 20.0.8-0ubuntu1~18.04.1 back to
  19.2.8-0ubuntu0~18.04.3.

  This solves the problem. So I suspect that the problem is in this
  specific package.

  My machine is (uname):
  4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:29:05 UTC 2017 x86_64 x86_64 
x86_64 GNU/Linux

  (lspci)
  00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller 
(rev 06)
  00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen 
Core Processor Integrated Graphics Controller (rev 06)
  00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB xHCI (rev 05)
  00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series 
Chipset Family MEI Controller #1 (rev 04)
  00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #2 (rev 05)
  00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High 
Definition Audio Controller (rev 05)
  00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #1 (rev d5)
  00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI 
Express Root Port #3 (rev d5)
  00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #1 (rev 05)
  00:1f.0 ISA bridge: Intel Corporation H81 Express LPC Controller (rev 05)
  00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset 
Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
  00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus 
Controller (rev 05)
  02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

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