[lldb] `Resource deadlock avoided` exception in `lldb::SBFrame::IsValid` in `ScriptedFrameProvider`

I am running into the following assertion while trying to use a `ScriptedFrameProvider`.
On git commit 6dd373f8aaab96b293a1374d3039b3c658b292e1.
On Ubuntu 24.04.

```
terminate called after throwing an instance of 'std::system_error'
what(): Resource deadlock avoided
LLDB diagnostics will be written to /tmp/diagnostics-a28e71
Please include the directory content when filing a bug report
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
#0 0x0000631423eedfa2 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/avogelsgesang/Documents/llvm-project/llvm/lib/Support/Unix/Signals.inc:884:3
#1 0x0000631423eeb0a4 llvm::sys::RunSignalHandlers() /home/avogelsgesang/Documents/llvm-project/llvm/lib/Support/Signals.cpp:108:20
#2 0x0000631423eeb9d1 SignalHandler(int, siginfo_t*, void*) /home/avogelsgesang/Documents/llvm-project/llvm/lib/Support/Unix/Signals.inc:448:14
#3 0x000076b11c845330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x000076b11c92728d syscall ./misc/../sysdeps/unix/sysv/linux/x86_64/syscall.S:38:0
#5 0x000076b11e06e3bb SignalHandler(int, siginfo_t*, void*) /home/avogelsgesang/Documents/llvm-project/llvm/lib/Support/Unix/Signals.inc:449:3
#6 0x000076b11c845330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#7 0x000076b11c89eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#8 0x000076b11c89eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#9 0x000076b11c89eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#10 0x000076b11c84527e raise ./signal/../sysdeps/posix/raise.c:27:6
#11 0x000076b11c8288ff abort ./stdlib/abort.c:81:7
#12 0x000076b11cca5ff5 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xa5ff5)
#13 0x000076b11ccbb01a (/lib/x86_64-linux-gnu/libstdc++.so.6+0xbb01a)
#14 0x000076b11cca5a55 std::unexpected() (/lib/x86_64-linux-gnu/libstdc++.so.6+0xa5a55)
#15 0x000076b11ccbb2d1 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xbb2d1)
#16 0x000076b11ccaa2a3 std::__throw_system_error(int) (/lib/x86_64-linux-gnu/libstdc++.so.6+0xaa2a3)
#17 0x000076b11daaf3f9 (/home/avogelsgesang/Documents/llvm-project/build/bin/../lib/liblldb.so.23.0git+0xaaf3f9)
#18 0x000076b11da57802 std::__shared_ptr::operator bool() const /usr/include/c++/13/bits/shared_ptr_base.h:1670:16
#19 0x000076b11da57802 lldb_private::ExecutionContextRef::GetFrameSP() const /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/ExecutionContext.cpp:689:73
#20 0x000076b11da57cca lldb_private::GetStoppedExecutionContext(lldb_private::ExecutionContextRef const*) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/ExecutionContext.cpp:164:17
#21 0x000076b11da58254 lldb_private::GetStoppedExecutionContext(std::shared_ptr const&) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/ExecutionContext.cpp:134:1
#22 0x000076b11d682323 lldb::SBFrame::operator bool() const /home/avogelsgesang/Documents/llvm-project/lldb/source/API/SBFrame.cpp:104:3
#23 0x000076b11d68254d lldb::SBFrame::IsValid() const /home/avogelsgesang/Documents/llvm-project/lldb/source/API/SBFrame.cpp:99:1
#24 0x000076b11d76a5a5 SWIG_Python_Thread_Allow::end() /home/avogelsgesang/Documents/llvm-project/build/tools/lldb/bindings/python/LLDBWrapPython.cpp:1040:73
#25 0x000076b11d76a5a5 SWIG_Python_Thread_Allow::end() /home/avogelsgesang/Documents/llvm-project/build/tools/lldb/bindings/python/LLDBWrapPython.cpp:1040:15
#26 0x000076b11d76a5a5 _wrap_SBFrame_IsValid /home/avogelsgesang/Documents/llvm-project/build/tools/lldb/bindings/python/LLDBWrapPython.cpp:37212:5
#27 0x000076b11bf235fc _PyEval_EvalFrameDefault (/lib/x86_64-linux-gnu/libpython3.12.so.1.0+0x1235fc)
#28 0x000076b11bf867bd (/lib/x86_64-linux-gnu/libpython3.12.so.1.0+0x1867bd)
#29 0x000076b11bf83adc (/lib/x86_64-linux-gnu/libpython3.12.so.1.0+0x183adc)
#30 0x000076b11bf8426b PyObject_CallMethod (/lib/x86_64-linux-gnu/libpython3.12.so.1.0+0x18426b)
#31 0x000076b11deb5756 llvm::Expected lldb_private::python::PythonObject::CallMethod(char const*, unsigned int const&) const /home/avogelsgesang/Documents/llvm-project/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h:312:5
#32 0x000076b11deb5756 auto std::shared_ptr lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...)::operator()(auto&&...) const /home/avogelsgesang/Documents/llvm-project/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h:532:34
#33 0x000076b11deb5756 std::shared_ptr std::__invoke_impl lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...), unsigned int&>(std::__invoke_other, std::shared_ptr lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...)&&, unsigned int&) /usr/include/c++/13/bits/invoke.h:61:36
#34 0x000076b11deb5756 std::__invoke_result, unsigned int&>::type std::__invoke lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...), unsigned int&>(std::shared_ptr&&, unsigned int&) /usr/include/c++/13/bits/invoke.h:96:40
#35 0x000076b11deb5756 decltype(auto) std::__apply_impl lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...), std::tuple&, 0ul>(std::shared_ptr&&, std::tuple&, std::integer_sequence) /usr/include/c++/13/tuple:2302:27
#36 0x000076b11deb5756 decltype(auto) std::apply lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&)::'lambda'(auto&&...), std::tuple&>(std::shared_ptr&&, std::tuple&) /usr/include/c++/13/tuple:2313:31
#37 0x000076b11deb5756 std::shared_ptr lldb_private::ScriptedPythonInterface::Dispatch, unsigned int&>(llvm::StringRef, lldb_private::Status&, unsigned int&) /home/avogelsgesang/Documents/llvm-project/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h:529:15
#38 0x000076b11deb5ba7 std::__shared_ptr::__shared_ptr(std::__shared_ptr const&) /usr/include/c++/13/bits/shared_ptr_base.h:1522:7
#39 0x000076b11deb5ba7 std::shared_ptr::shared_ptr(std::shared_ptr const&) /usr/include/c++/13/bits/shared_ptr.h:204:7
#40 0x000076b11deb5ba7 lldb_private::ScriptedFrameProviderPythonInterface::GetFrameAtIndex(unsigned int) /home/avogelsgesang/Documents/llvm-project/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedFrameProviderPythonInterface.cpp:93:52
#41 0x000076b11df98159 std::__shared_ptr::operator bool() const /usr/include/c++/13/bits/shared_ptr_base.h:1670:16
#42 0x000076b11df98159 lldb_private::ScriptedFrameProvider::GetFrameAtIndex(unsigned int) /home/avogelsgesang/Documents/llvm-project/lldb/source/Plugins/SyntheticFrameProvider/ScriptedFrameProvider/ScriptedFrameProvider.cpp:172:8
#43 0x000076b11dab1403 lldb_private::SyntheticStackFrameList::FetchFramesUpTo(unsigned int, InterruptionControl) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:104:7
#44 0x000076b11daad790 lldb_private::StackFrameList::GetFramesUpTo(unsigned int, InterruptionControl) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:470:36
#45 0x000076b11daad843 lldb_private::StackFrameList::GetFrameAtIndex(unsigned int) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:715:3
#46 0x000076b11daadb14 std::__shared_ptr::operator bool() const /usr/include/c++/13/bits/shared_ptr_base.h:1670:16
#47 0x000076b11daadb14 lldb_private::StackFrameList::IsNextFrameHidden(lldb_private::StackFrame&) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:966:8
#48 0x000076b11daadbeb lldb_private::StackFrameList::GetFrameMarker[abi:cxx11](std::shared_ptr, std::shared_ptr, bool) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:991:3
#49 0x000076b11daae337 std::__cxx11::basic_string, std::allocator>::_M_data() const /usr/include/c++/13/bits/basic_string.h:223:28
#50 0x000076b11daae337 std::__cxx11::basic_string, std::allocator>::_M_is_local() const /usr/include/c++/13/bits/basic_string.h:264:13
#51 0x000076b11daae337 std::__cxx11::basic_string, std::allocator>::operator=(std::__cxx11::basic_string, std::allocator>&&) /usr/include/c++/13/bits/basic_string.h:858:18
#52 0x000076b11daae337 lldb_private::StackFrameList::GetStatus(lldb_private::Stream&, unsigned int, unsigned int, bool, unsigned int, bool, bool, bool, bool) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/StackFrameList.cpp:1030:49
#53 0x000076b11db0196e std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count() /usr/include/c++/13/bits/shared_ptr_base.h:1070:6
#54 0x000076b11db0196e std::__shared_ptr::~__shared_ptr() /usr/include/c++/13/bits/shared_ptr_base.h:1524:7
#55 0x000076b11db0196e std::shared_ptr::~shared_ptr() /usr/include/c++/13/bits/shared_ptr.h:175:11
#56 0x000076b11db0196e lldb_private::Thread::GetStatus(lldb_private::Stream&, unsigned int, unsigned int, unsigned int, bool, bool, bool) /home/avogelsgesang/Documents/llvm-project/lldb/source/Target/Thread.cpp:2143:41
#57 0x000076b11d88dc46 std::unique_ptr>::~unique_ptr() /usr/include/c++/13/bits/unique_ptr.h:403:2
#58 0x000076b11d88dc46 lldb_private::Debugger::HandleThreadEvent(std::shared_ptr const&) /home/avogelsgesang/Documents/llvm-project/lldb/source/Core/Debugger.cpp:2125:49
#59 0x000076b11d89a51b std::__shared_ptr::operator bool() const /usr/include/c++/13/bits/shared_ptr_base.h:1670:16
#60 0x000076b11d89a51b lldb_private::Debugger::DefaultEventHandler() /home/avogelsgesang/Documents/llvm-project/lldb/source/Core/Debugger.cpp:2285:65
#61 0x000076b11d995a6c std::function::operator()() const /usr/include/c++/13/bits/std_function.h:591:9
#62 0x000076b11d995a6c lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*) /home/avogelsgesang/Documents/llvm-project/lldb/source/Host/common/HostNativeThreadBase.cpp:62:23
#63 0x000076b11c89caa4 start_thread ./nptl/pthread_create.c:447:8
#64 0x000076b11c929c6c clone3 ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:80:0
./repro-crash.sh: line 24: 405025 Aborted (core dumped) "$LLDB" -o "breakpoint set --file async-task-example.cpp --line 4" -o "run" -o "command script import repro_min.py" -o "bt" -o "quit" "$BUILD_DIR/a.out"
```

----

**Repro**

1. take `async-task-library.hpp` from https://clang.llvm.org/docs/DebuggingCoroutines.html#async-stack-traces

2. Save the following in `repro.cpp`

```cpp
#include "async-task-library.hpp"

static task f() {
co_return 0;
}

int main() {
f().syncStart();
}
```

3. Save the following in `frame_provider.py`

```python
from lldb.plugins.scripted_frame_provider import ScriptedFrameProvider

class MinProvider(ScriptedFrameProvider):
@staticmethod
def get_description():
return "min repro"

def get_frame_at_index(self, index):
bool(self.input_frames[0])
return index

def __lldb_init_module(debugger, internal_dict):
debugger.HandleCommand(f"target frame-provider register -C {__name__}.MinProvider")
```

4. Run the script

```bash
#!/bin/bash
# Reproducer for LLDB crash when running `bt` after importing the
# repro_min.py frame provider.

set -eu

BUILD_DIR="$(mktemp -d)"
trap 'rm -rf "$BUILD_DIR"' EXIT

clang++ -std=c++20 -g -O0 -fno-omit-frame-pointer \
repro.cpp \
-o "$BUILD_DIR/a.out"

lldb \
-o "breakpoint set --file repro.cpp --line 4" \
-o "run" \
-o "command script import repro_min.py" \
-o "bt" \
-o "quit" \
"$BUILD_DIR/a.out"
```

Reproduce the ScriptedFrameProvider failure on Ubuntu 24.04 at commit 6dd373f8aaab96b293a1374d3039b3c658b292e1, including the reported diagnostics directory. Start with lldb/source/API/SBFrame.cpp, lldb/source/Target/ExecutionContext.cpp, ScriptedFrameProvider.cpp, and ScriptedFrameProviderPythonInterface.cpp, following the SBFrame::IsValid call path. Done means the reproducer no longer terminates with Resource deadlock avoided and an LLDB regression test covers it.

Written by the indexing model from the issue text.