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* [Bug 110360] AMD system hits AMD-Vi: Completion-Wait loop timed out on Acer Squirtle_SR laptop
@ 2019-04-09  5:37 bugzilla-daemon
  2019-04-09  5:38 ` bugzilla-daemon
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  0 siblings, 15 replies; 16+ messages in thread
From: bugzilla-daemon @ 2019-04-09  5:37 UTC (permalink / raw)
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https://bugs.freedesktop.org/show_bug.cgi?id=110360

            Bug ID: 110360
           Summary: AMD system hits AMD-Vi: Completion-Wait loop timed out
                    on Acer Squirtle_SR laptop
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jian-hong@endlessm.com

Created attachment 143905
  --> https://bugs.freedesktop.org/attachment.cgi?id=143905&action=edit
The error log

We have an Acer Squirtle_SR laptop equipped with AMD A9-9420e RADEON R5, 5
COMPUTE CORES 2C+3G and [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 /
M440/M445] [1002:6900].  We test it with Linux kernel 5.1.0-rc4.  The system
hits the following error and makes system hang up:

Apr 09 11:28:57 endless kernel: AMD-Vi: Completion-Wait loop timed out
Apr 09 11:28:57 endless kernel: iwlwifi 0000:03:00.0: AMD-Vi: Event logged
[IO_PAGE_FAULT domain=0x0000 address=0xff814000 flags=0x0050]

The worst case is the disk's block may be disrupted, then we have to re-install
the system if it cannot be recovered by fsck.

If we blacklist the amdgpu module, then system will not hit the error.  But
system has no GUI, and only shows console.

If iommu=soft is appended to the boot command, system works fine.

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