https://bugs.llvm.org/show_bug.cgi?id=43250
Bug ID: 43250
Summary: lld crash on guid collision when using thinlto
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 22479
--> https://bugs.llvm.org/attachment.cgi?id=22479&action=edit
Full stacktrace
Happened upon a crash in lld when linking Chromium (see
https://crbug.com/1000691).
Two global symbols (one function and one variable) from different modules end
up with the same GUID.
When linking using thinlto this leads to a crash because code in
FunctionImportUtils.cpp treats any GlobalValue with a GlobalVarSummary attached
as a GlobalVariable but as both the symbols have the same GUID the global
function also has the GlobalVarSummary attached.
Assert:
ld.lld: chromium/src/third_party/llvm/llvm/include/llvm/Support/Casting.h:264:
typename cast_retty<X, Y *>::ret_type llvm::cast(Y *) [X =
llvm::GlobalVariable, Y = llvm::GlobalValue]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.
Top of stacktrace (full stacktrace attached):
#4 0x000056267cb57788 in llvm::cast<llvm::GlobalVariable, llvm::GlobalValue>
(Val=<optimized out>)
at chromium/src/third_party/llvm/llvm/include/llvm/Support/Casting.h:264
#5 llvm::FunctionImportGlobalProcessing::processGlobalForThinLTO
(this=0x7f7ec9d06720, GV=...)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:252
#6 0x000056267cb5792c in
llvm::FunctionImportGlobalProcessing::processGlobalsForThinLTO
(this=0x7f7ec9d06720)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:296
#7 0x000056267cb57bfd in llvm::FunctionImportGlobalProcessing::run
(this=0x7f7ec9d06720)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:312
#8 llvm::renameModuleForThinLTO (M=..., Index=..., GlobalsToImport=<optimized
out>)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:319
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