https://bugs.llvm.org/show_bug.cgi?id=38647
Bug ID: 38647
Summary: LLD can crash if exiting due to errors in writeTo
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: COFF
Assignee: unassignedb...@nondot.org
Reporter: mar...@martin.st
CC: llvm-bugs@lists.llvm.org
If LLD chooses to exit due to errors (either due to a 'fatal', or too many
'error') from within the writeTo methods (which are run in parallel), the
linker can easily crash.
The writeTo methods are run in parallel on many threads. When one of these
threads report errors that lead to the linker exiting, calling the exitLld
function, the exitLld function closes the output buffer, which can cause the
other threads to crash (which still are trying to write output data to the
buffer).
One way of making the error less prone to happen would to change most 'fatal'
into 'error' in Chunks.cpp, but that could still cause the linker to error out
once one has encountered too many errors.
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