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MachProcess has a MachTask as an ivar. In the MachProcess dtor, we call MachTask::Clear() to clear its state, before running the dtor of all our ivars, including the MachTask one. When we attach on darwin, MachProcess calls MachTask::StartExceptionThread which does the task_for_pid and then starts a thread to listen for mach messages. Then MachProcess calls ptrace(PT_ATTACHEXC). If that ptrace() fails, MachProcess will call MachTask::Clear. But the exception thread is now up & running and is not stopped; its ivars will be reset by the Clear() method, and its object will be freed after the dtor runs. Actually eliciting a crash in this scenario is very timing sensitive; I hand-modified debugserver to fail to PT_ATTACHEXC trying to simulate it on my desktop and was unable. But looking at the source, and an occasional crash report we've received, it's clear that this is possible. rdar://117521198 |
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| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| packages/Python/lldbsuite | ||
| resources | ||
| scripts | ||
| source | ||
| test | ||
| third_party/Python/module | ||
| tools | ||
| unittests | ||
| utils | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CodeOwners.rst | ||
| LICENSE.TXT | ||
| use_lldb_suite_root.py | ||