http://llvm.org/bugs/show_bug.cgi?id=21806
Bug ID: 21806
Summary: Race conditions in Mach-O driver file parsing.
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
lld Driver parse InputElement concurrently using a TaskGroup.
Unfortunately, the InputElement parse() implementations are not thread safe.
Especially all access to the LinkerContext should be protected by a mutex.
For instance, when parsing Mach-O file using MachOFileNode::parse(), the parse
function call MachOLinkingContext::addInputFileDependency and
MachOLinkingContext::registerDylib which are not thread-safe.
I got a bunch of random crash when the context try to access the _allDylibs
member after parsing and that member was corrupted by a concurrent access
during parsing.
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