[Bug 97524] Invalid sampler settings cause full GPU reset - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 97524] Invalid sampler settings cause full GPU reset
Date: Mon, 29 Aug 2016 04:06:14 +0000	[thread overview]
Message-ID: <bug-97524-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=97524

            Bug ID: 97524
           Summary: Invalid sampler settings cause full GPU reset
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: dark_sylinc@yahoo.com.ar
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 126091
  --> https://bugs.freedesktop.org/attachment.cgi?id=126091&action=edit
Bug repro

Running invalid the following GL settings hangs Mesa pretty badly. Sometimes it
says stuck on ring(0)/(3), other times it just hangs; GPU tries to reset but
does a really poor job (at least I can blindly go to tty1 via Ctrl+Alt+F1 then
reboot via Ctrl+Alt+Supr).

Attachment provided to repro the bug.

What is causing it:
Vertex Shader must use samplerBuffer on binding point 0.
Pixel Shader must use samplerCube on binding point 0.
Bind a TBO to binding point 0.

What happens:
Near full system hang, it becomes really unstable. System can be soft-rebooted
but that's it.

What should happen:
All other GPU drivers I tested with handle this gracefully by raising a
GL_INVALID_OPERATION error and continuing rendering the rest normally.

Version tested: Latest git 22cec6dc5e5a3060bc87f4a92871b4f6eef04632

I'm assigning a low priority since this GL setting combination is invalid to
begin with and I want to believe software isn't shipped like this (though
considering other GPU drivers allow to ignore the problem, I wouldn't be fully
surprised if there is faulty software out there...); though I believe the
system shouldn't hang because of this.

GL_VERSION = 4.3.0.0
GL_VENDOR = X.Org
GL_RENDERER = Gallium 0.4 on AMD CAPE VERDE (DRM 2.45.0 / 4.7.0-040700-generic,
LLVM 3.9.0)

uname -r
4.7.0-040700-generic

Cheers

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