[Bug 109200] VMC page fault and Coherent Slave Error: Address violation after upgrading to 4.20

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109200

            Bug ID: 109200
           Summary: VMC page fault and Coherent Slave Error: Address
                    violation after upgrading to 4.20
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: vicluo96 at gmail.com

Created attachment 142927
  --> https://bugs.freedesktop.org/attachment.cgi?id=142927&action=edit
kernel log on 4.20.arch1-1

I'm currently using AMD 2500U on Thinkpad E585 with Archlinux kernel
4.20.arch1-1. Everything works fine with 4.19.12. However after upgrading to
4.20.arch1-1, system crashes after gnome-shell starts. The error log reports:

Dec 31 11:57:09 lzThinkpad kernel: amdgpu 0000:05:00.0: [mmhub] VMC page fault
(src_id:0 ring:158 vmid:1 pasid:32768, for process gnome-shell pid 1008 thread
gnome-shel:cs0 pid 1022)
Dec 31 11:57:09 lzThinkpad kernel: amdgpu 0000:05:00.0:   in page starting at
address 0x0000800100020000 from 18
Dec 31 11:57:09 lzThinkpad kernel: amdgpu 0000:05:00.0:
VM_L2_PROTECTION_FAULT_STATUS:0x0010013C
Dec 31 11:57:09 lzThinkpad kernel: mce: [Hardware Error]: Machine check events
logged
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Deferred error, no action
required.
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: CPU:0 (17:11:0)
MC20_STATUS[-|-|MiscV|-|AddrV
Dec 31 11:57:09 lzThinkpad kernel: amdgpu 0000:05:00.0: [mmhub] VMC page fault
(src_id:0 ring:158 vmid:1 pasid:32768, for process gnome-shell pid 1008 thread
gnome-shel:cs0 pid 1022)
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: IPID: 0x0000002e00000000,
Syndrome: 0x000000005b240205
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Coherent Slave Error:
Address violation.
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Deferred error, no action
required.
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: cache level: L3/GEN,
mem/io: IO, mem-tx: IRD, part-proc: SRC (no timeout)
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Coherent Slave Extended
Error Code: 1
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
Dec 31 11:57:09 lzThinkpad kernel: [Hardware Error]: Error Addr:
0x00007ffcffffff00
(more Error Addr lines omitted)

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