[Bug 111682] use-after-free in amdgpu_vm_update_directories

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111682

            Bug ID: 111682
           Summary: use-after-free in amdgpu_vm_update_directories
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: pierre-eric.pelloux-prayer at amd.com

Created attachment 145345
  --> https://bugs.freedesktop.org/attachment.cgi?id=145345&action=edit
dmesg output

When using amdgpu.vm_update_mode=3 the following error appears after some time
(ranging from a few minutes to a few hours):

BUG: KASAN: use-after-free in amdgpu_vm_update_directories

I attached the relevant dmesg part.

Notes:
- happens on Navi10 and gfx9 (probably also on other cards but I didn't try)
- reproduced on 865b4ca43816e113996c3be571d4998b6daf5f1 and
20d6b9c3b7f40ec427af912d140f2be0de098d2d

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