https://bugs.llvm.org/show_bug.cgi?id=49441
Bug ID: 49441
Summary: RuntimeDyld relocation overflow (Regression in LLVM
12.rc2/trunk)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Linker
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24589
--> https://bugs.llvm.org/attachment.cgi?id=24589&action=edit
Reproducer -- crashes with an assertion failure on Trunk
Dear LLVM team,
I'm using LLVM to JIT-compile relocatable vectorized code across various
platforms.
With the latest LLVM trunk, a large portion of previously working code triggers
an assertion failure while applying relocations in RuntimeDyldCOFFX86_64
(Windows/x64):
Assertion failed: ((int64_t)Result <= INT32_MAX) && "Relocation overflow", file
C:\\llvm\lib\ExecutionEngine\RuntimeDyld\Targets/RuntimeDyldCOFFX86_64.h, line
105
The same works with LLVM 10 and 11. Something very strange is happening here as
well -- if I enable debug messages, I can see the identifiers of those
relocations, and one seems to have a bogus name, and a very large addend
(4294967295 == -0x1), which is what ultimately triggers the crash.
SectionID: 12
In Section 12 Offset 78 RelType:
4 TargetName: __real@7fffffff Addend 0
In Section 12 Offset 87 RelType: 4 TargetName: __real@3f000000 Addend 0
In Section 12 Offset 96 RelType: 4
TargetName: __real@40490fdb Addend 0
In Section 12 Offset 111 RelType: 4 TargetName: __real@3f800000 Addend 0
In Section 12 Offset 126 RelType: 4
TargetName: __real@3d2cb352 Addend 0
In Section 12 Offset 140 RelType: 4 TargetName: __real@3cc617e3 Addend 0
In Section 12 Offset 149 RelType: 4
TargetName: __real@3d3a3ec7 Addend 0
In Section 12 Offset 158 RelType: 4 TargetName: __real@3d9980f6 Addend 0
In Section 12 Offset 167 RelType: 4
TargetName: __real@3e2aaae4 Addend 0
In Section 12 Offset 176 RelType: 4 TargetName: __real@3fc90fdb Addend 0
In Section 12 Offset 185 RelType: 4
TargetName: __real@80000000 Addend 0
In Section 12 Offset 289 RelType: 4 TargetName:
__ymm@0000000000000000000000000000000000000000000000000000000000000000 Addend
4294967295
I've isolated the smallest piece of code in our test suite that triggers this
crash and wrapped into a tiny MCJIT harness. Please see the attached file.
Best,
Wenzel
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