[Bug 111077] link_shader and deserialize_glsl_program suddenly consume huge amount of RAM

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111077

--- Comment #1 from roland at rptd.ch <roland at rptd.ch> ---
I've started the application now also in a debugger and went to loading a
simple model which causes tons of RAM to be consumes by the shader compiler. I
interrupted with GDB and made a trace:

#0 0x00007f650ee794e7 in __memcpy_ssse3 () from /lib64/libc.so.6
#1 0x00007f650776a390 in blob_write_bytes () from
/usr/lib64/dri/radeonsi_dri.so
#2 0x00007f650776a4e8 in blob_write_uint32 () from
/usr/lib64/dri/radeonsi_dri.so
#3 0x00007f6507636421 in serialize_glsl_program () from
/usr/lib64/dri/radeonsi_dri.so
#4 0x00007f6507638132 in shader_cache_write_program_metadata(gl_context*,
gl_shader_program*) () from /usr/lib64/dri/radeonsi_dri.so
#5 0x00007f65074a9a38 in link_program_error () from
/usr/lib64/dri/radeonsi_dri.so
#6 0x00007f6509d85a3d in deoglShaderLanguage::pLinkShader (this=0x7f65004360c0,
handle=298) at
src/modules/graphic/opengl/src/shaders/deoglShaderLanguage.cpp:1272
#7 0x00007f6509d86537 in deoglShaderLanguage::CompileShader
(this=0x7f65004360c0, program=...) at
src/modules/graphic/opengl/src/shaders/deoglShaderLanguage.cpp:530

Mesa gets stuck inside "link_program_error" =>
"shader_cache_write_program_metadata" => "serialize_glsl_program" . Most
probably serialize_glsl_program goes rampage there but I have no idea if this
is the real reason. According to the massif logs though ralloc_size is called
with GB of data multiple time in there somewhere.

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