[Bug 81907] New: Unreal Engine "Effects Cave" Demo crashes in __memcpy_sse2_unaligned

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81907

          Priority: medium
            Bug ID: 81907
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Unreal Engine "Effects Cave" Demo crashes in
                    __memcpy_sse2_unaligned
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: haagch at frickel.club
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 103673
  --> https://bugs.freedesktop.org/attachment.cgi?id=103673&action=edit
full backtrace

llvm-svn 214022
mesa git master from today without f4b0ab7afd83c811329211eae8167c9bf238870c
linux 3.16-rc7

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)

intel with render nodes, tearfree and DRI3 and I run it with DRI_PRIME=1.

Because of bug 81834 I reverted f4b0ab7afd83c811329211eae8167c9bf238870c.

Now I get this crash in the "Effects Cave" demo of the unreal engine. More
rarely (?) I get bug 80880 instead/first. In other demos (perhaps less complex)
like TappyChicken I always get bug 80880 and never (?) this crash here:

0x00007ffff6a15859 in __memcpy_sse2_unaligned () from /usr/lib/libc.so.6


It seems to run for a few seconds, the music is playing, but the window
contents are black (it seems nothing at all is rendered, sometimes there are
white stripes that do not vanish until it crashes). Then it crashes with the
attached backtrace.

The "binary" struct seem to be always one of the same few. Others are:

binary = {code = 0x7fffb9ced270
"~\n\376\276\t\003\374\276\002\003\002\310\002\002\006\310\001\001", code_size
= 76, config = 0x7fffb9cf1a90 "(\260", config_size = 24, rodata = 0x0,
rodata_size = 0, disassembled = 0}

and

binary = {code = 0x7fffb9f85a10 "~\n\376\276\t", <incomplete sequence
\374\276>, code_size = 4160, config = 0x7fffb9e33840 "(\260", config_size = 24,
rodata = 0x0, rodata_size = 0, disassembled = 0}

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