https://bugs.freedesktop.org/show_bug.cgi?id=93447
Bug ID: 93447
Summary: [r600g] llvm crash because of use of uninitialized
stack
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/r600
Assignee: dri-devel at lists.freedesktop.org
Reporter: notasas at gmail.com
QA Contact: dri-devel at lists.freedesktop.org
Created attachment 120595
--> https://bugs.freedesktop.org/attachment.cgi?id=120595&action=edit
hack patch
When replaying traces from Bug 92229 with R600_DEBUG=llvm specified a crash
will occur (on my system) in LLVMBuildInsertElement() because uninitialized
value in Index argument is passed. That value originates from
radeon_llvm_emit_prepare_cube_coords() function's coords[3] stack variable. At
that time,
opcode = TGSI_OPCODE_TEX
target = TGSI_TEXTURE_CUBE
so nothing ever sets coords[3], which is copied to the caller and eventually
finds it way to llvm.
Unfortunately I don't have any knowledge about that code, I hope somebody who
knows more can take a look. A hack patch is attached but it's most likely
wrong.
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