http://llvm.org/bugs/show_bug.cgi?id=16229
Bug ID: 16229
Summary: waitpid fails after attach to processes that aren't
group leaders
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
On Linux, when LLDB attaches to a process that is not a group leader the
MonitorChildProcessThread will terminate prematurely. This happens because the
call to waitpid(-1*pid,...) fails with an ECHILD error.
It is possible to avoid this error by passing just -1 to waitpid, but that
results in signals for all children (including LLDB threads) to be reported.
More investigation is required to determine the feasibility of this solution.
One situation in which this condition occurs is when the process to which we
are attaching is launched from a Python script using the subprocess.Popen
constructor. This failure is demonstrated in the
CreateAfterAttach.test_create_after_attach_with_dwarf_and_popen test case. A
workaround is demonstrated by the
CreateAfterAttach.test_create_after_attach_with_dwarf_and_popen test case.
Both are in test/functionalities/thread/create_after_attach.
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