labath added a comment.
In https://reviews.llvm.org/D35223#834050, @emaste wrote:
> With this patch I observed three new failures on FreeBSD and three new
> unexpected passes on FreeBSD. An example of a new failure:
>
> ======================================================================
> FAIL: test_inferior_crashing_expr_step_and_expr_dwarf
> (TestInferiorCrashing.CrashingInferiorTestCase)
> Test that lldb expressions work before and after stepping after a crash.
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> File
> "/tank/emaste/src/llvm/tools/lldb/packages/Python/lldbsuite/test/lldbtest.py",
> line 1732, in dwarf_test_method
> return attrvalue(self)
> File
> "/tank/emaste/src/llvm/tools/lldb/packages/Python/lldbsuite/test/decorators.py",
> line 110, in wrapper
> func(*args, **kwargs)
> File
> "/tank/emaste/src/llvm/tools/lldb/packages/Python/lldbsuite/test/functionalities/inferior-crashing/TestInferiorCrashing.py",
> line 82, in test_inferior_crashing_expr_step_and_expr
> self.inferior_crashing_expr_step_expr()
> File
> "/tank/emaste/src/llvm/tools/lldb/packages/Python/lldbsuite/test/functionalities/inferior-crashing/TestInferiorCrashing.py",
> line 249, in inferior_crashing_expr_step_expr
> self.check_stop_reason()
> File
> "/tank/emaste/src/llvm/tools/lldb/packages/Python/lldbsuite/test/functionalities/inferior-crashing/TestInferiorCrashing.py",
> line 93, in check_stop_reason
> STOPPED_DUE_TO_EXC_BAD_ACCESS)
> AssertionError: 0 != 1 : Process should be stopped due to bad access
> exception
> Config=x86_64-/usr/bin/cc
> ----------------------------------------------------------------------
> Ran 7 tests in 4.320s
>
>
> From lldbsuite/test/lldbutil.py:
>
> def is_thread_crashed(test, thread):
> """In the test suite we dereference a null pointer to simulate a crash.
> The way this is
> reported depends on the platform."""
> if test.platformIsDarwin():
> return thread.GetStopReason(
> ) == lldb.eStopReasonException and "EXC_BAD_ACCESS" in
> thread.GetStopDescription(100)
> elif test.getPlatform() == "linux":
> return thread.GetStopReason() == lldb.eStopReasonSignal and
> thread.GetStopReasonDataAtIndex(
> 0) ==
> thread.GetProcess().GetUnixSignals().GetSignalNumberFromName("SIGSEGV")
> else:
> return "invalid address" in thread.GetStopDescription(100)
>
>
> Presumably we want the second case to apply on FreeBSD as well when this
> patch is in, although I don't see why the existing else case shouldn't
> continue to work correctly.
Actually, I think you probably need to extend the `@skipIfLinux` to apply to
freebsd as well. The reason is that the test is doing something which goes
fundamentally against this patch -- it expects that "step" after a "crash" is a
no-op, whereas the new behavior will be to let the process continue (and
probably exit, unless it has a SEGV handler). That behavior may make sense for
mach exceptions, but I don't think we should try to make posix signals emulate
that behavior.
Repository:
rL LLVM
https://reviews.llvm.org/D35223
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