@jsalisbury: I had the machine tested with this kernel:

Linux xa-xubu 4.18.0-041800rc1-generic #201806162031 SMP Sun Jun 17
00:34:22 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

that I found via your link [0].

The result is that in this kernel, the problem is gone. So that sounds
like good news!

I think there was another commenter asking me to try a (probably
different) upstream kernel, but it seems gone now. To them I can report
that I didn't try building a kernel myself, but hopefully their proposal
was close enough to using the Ubuntu mainline kernel that this test
gives them the answer they are looking for.


** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1777245

Title:
  X freezes with kernel 4.15.0-23-generic (AMDGPU)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This is on my parents machine; I only have remote access and not
  continuously, so this may slow down providing additional information.

  Since the latest kernel upgrade (from
   Linux version 4.13.0-43-generic (buildd@lgw01-amd64-026) (gcc version 7.2.0 
(Ubuntu 7.2.0-8ubuntu3.2)) #48-Ubuntu SMP Wed May 16 12:18:48 UTC 2018 (Ubuntu 
4.13.0-43.48-generic 4.13.16)  
  to  
  Linux version 4.15.0-23-generic (buildd@lgw01-amd64-055) (gcc version 7.3.0 
(Ubuntu 7.3.0-16ubuntu3)) #25-Ubuntu SMP Wed May 23 18:02:16 UTC 2018 (Ubuntu 
4.15.0-23.25-generic 4.15.18)
  the machine appears to freezes some time soon after booting. It is just X; 
the machine is still reachable via ssh.

  I filed this bug using apport-cli, running the older (working) kernel,
  not the newer (failing) one.

  In /var/log/kernel I can see the following:

  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562386] INFO: task Xorg:757 blocked 
for more than 120 seconds.
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562396]       Not tainted 
4.15.0-23-generic #25-Ubuntu
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562399] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562403] Xorg            D    0   757   
 724 0x00400004
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562408] Call Trace:
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562424]  __schedule+0x297/0x8b0
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562430]  ? __kfifo_in+0x37/0x50
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562434]  schedule+0x2c/0x80
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562559]  
amd_sched_entity_push_job+0xad/0xf0 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562565]  ? wait_woken+0x80/0x80
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562653]  amdgpu_job_submit+0x9f/0xc0 
[amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562723]  
amdgpu_vm_bo_update_mapping+0x389/0x3f0 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562793]  ? 
amdgpu_vm_it_iter_first+0x40/0x40 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562863]  
amdgpu_vm_bo_update+0x325/0x5b0 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562930]  
amdgpu_gem_va_ioctl+0x524/0x540 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.562962]  ? 
drm_gem_handle_create_tail+0x120/0x190 [drm]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563028]  ? 
amdgpu_gem_create_ioctl+0xc1/0x270 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563096]  ? 
amdgpu_gem_metadata_ioctl+0x1c0/0x1c0 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563115]  drm_ioctl_kernel+0x5f/0xb0 
[drm]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563134]  ? drm_ioctl_kernel+0x5f/0xb0 
[drm]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563154]  drm_ioctl+0x31b/0x3d0 [drm]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563220]  ? 
amdgpu_gem_metadata_ioctl+0x1c0/0x1c0 [amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563225]  ? update_load_avg+0x57f/0x6e0
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563231]  ? futex_wake+0x8f/0x180
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563290]  amdgpu_drm_ioctl+0x4f/0x90 
[amdgpu]
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563296]  do_vfs_ioctl+0xa8/0x630
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563300]  ? __schedule+0x29f/0x8b0
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563304]  SyS_ioctl+0x79/0x90
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563309]  do_syscall_64+0x73/0x130
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563313]  
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563317] RIP: 0033:0x7fbd7ddcf5d7
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563319] RSP: 002b:00007fff67e69aa8 
EFLAGS: 00003246 ORIG_RAX: 0000000000000010
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563322] RAX: ffffffffffffffda RBX: 
0000000000020000 RCX: 00007fbd7ddcf5d7
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563324] RDX: 00007fff67e69af0 RSI: 
00000000c0286448 RDI: 000000000000000e
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563326] RBP: 00007fff67e69af0 R08: 
0000000101440000 R09: 000000000000000a
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563328] R10: 0000000000000039 R11: 
0000000000003246 R12: 00000000c0286448
  Jun 15 23:26:23 xa-xubu kernel: [ 2417.563330] R13: 000000000000000e R14: 
000055e820965f20 R15: 0

  
  which seems to point to some in-kernel AMD GPU driver.
  Since the problem seems to disappear when switching back to the previous 
kernel, I filed this as a kernel bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.13.0-43.48-generic 4.13.16
  Uname: Linux 4.13.0-43-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  rhialto   21222 F.... pulseaudio
   /dev/snd/controlC0:  rhialto   21222 F.... pulseaudio
  Date: Sat Jun 16 16:03:46 2018
  InstallationDate: Installed on 2017-10-29 (230 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 
(20171017.1)
  IwConfig:
   enp1s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: LENOVO 90G9001RNY
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-43-generic.efi.signed 
root=UUID=103b739d-56cf-440b-a2b4-fc955e1a0a41 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-43-generic N/A
   linux-backports-modules-4.13.0-43-generic  N/A
   linux-firmware                             1.173.1
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-06-09 (7 days ago)
  dmi.bios.date: 12/29/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: O2HKT24A
  dmi.board.name: Jadeite CRB
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40700 WIN 3258076524150
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnLENOVO:bvrO2HKT24A:bd12/29/2016:svnLENOVO:pn90G9001RNY:pvrideacentre310S-08ASR:rvnLENOVO:rnJadeiteCRB:rvrSDK0J40700WIN3258076524150:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: ideacentre 310S-08ASR
  dmi.product.name: 90G9001RNY
  dmi.product.version: ideacentre 310S-08ASR
  dmi.sys.vendor: LENOVO

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