cpptools crash in auto_complete::handle_completion

[x1ntt]

Environment

• OS and Version: win11 24h2
• VS Code Version: 1.85.2
• C/C++ Extension Version: 1.24.0
• If using SSH remote, specify OS of remote machine: centos7.9

Bug Summary and Steps to Reproduce

Bug Summary:

Unknow... sorry

Steps to reproduce:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior:

Configuration and Logs

cpptools
2025/7/8 16:27:11
SIGSEGV
cpptools_context::textDocument_completion(CompletionParams&&, unsigned int)+969
…
msvc::thread_manager_t::queue_item<msvc::deque_thread<std::function<void ()>>::defer(std::function<void ()>&&)::{lambda()#1}>::operator()()+309
msvc::thread_manager_t::do_work(unsigned int)+486

The following seems to have been resolved： #13358

cpptools-srv
2025/7/8 18:04:26
SIGSEGV
get_mangled_function_name(a_routine*, int)+257
edge::scope_entry::compute_functions() const+186
edge::scope_entry::ensure_functions() const+33
…
…
edge::intellisense_operation::get_auto_complete_members(edge::member_selection_entry*&, edge::scope_entry*&, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, edge::intellisense_operation::member_list_kind, bool, bool&, bool&, bool&, std::map<edge::symbol*, unsigned int, std::less<edge::symbol*>, std::allocator<std::pair<edge::symbol* const, unsigned int>>>*)+2656
edge::intellisense_operation::get_auto_complete_members(edge::member_selection_entry*&, edge::scope_entry*&, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, edge::list<edge::symbol*>*, std::map<edge::symbol*, unsigned int, std::less<edge::symbol*>, std::allocator<std::pair<edge::symbol* const, unsigned int>>>*, edge::intellisense_operation::member_list_kind)+63
std::_Function_handler<void (edge::intellisense_operation&, bool&), edge_intellisense_server_impl::handle_completion(cpp_intellisense::DocumentPosition const&, bool, std::string const&, cpp_intellisense::CompletionResponse&, snapshot::snapshot_session_t const&)::{lambda(edge::intellisense_operation&, bool&)#2}>::_M_invoke(std::_Any_data const&, edge::intellisense_operation&, bool&)+118
void edge_intellisense_operation::perform_isense_operation<bool>(char const*, edge::file_position const&, std::function<void (edge::intellisense_operation&, bool&)>&&, bool&, snapshot::snapshot_session_t const&, bool)+203
edge_intellisense_server_impl::handle_completion(cpp_intellisense::DocumentPosition const&, bool, std::string const&, cpp_intellisense::CompletionResponse&, snapshot::snapshot_session_t const&)+1794
cpp_intellisense::server_stub::handle_completion(msvc::deserializer_t&, msvc::serializer_t&)+336
msvc::base_channel_t::dispatch_message(std::vector<unsigned char, std::allocator<unsigned char>> const&, std::vector<unsigned char, std::allocator<unsigned char>>&)+571
msvc::common_channel_t::perform_call(unsigned int, std::vector<unsigned char, std::allocator<unsigned char>> const&)+66

Other Extensions

No response

Additional context

No response

[sean-mcmanus]

@x1ntt You're using an old version of our extension 1.24.0 and the get_mangled_function name crash was fixed in 1.24.4 (see #13358) can you upgrade your version? The newest 1.26.3 is recommended and has the most crash fixes.

[x1ntt]

@x1ntt You're using an old version of our extension 1.24.0 and the get_mangled_function name crash was fixed in 1.24.4 (see #13358) can you upgrade your version? The newest 1.26.3 is recommended and has the most crash fixes.

Yes, I just upgraded.
There is also a cpptools_context::textDocument_completion(CompletionParams&&, unsigned int)+969. I didn't find any other issues for this.

[sean-mcmanus]

@x1ntt Yeah, it sounds like that is still reproing? Are you able to create a sample repro that triggers the crash? Or any any other additional repro info? I'm not sure if that call stack is enough info, but I could double check tomorrow.

[x1ntt]

This happened by accident, I don't have a specific solution to reproduce it, but I can give you the complete stack of the core file (core cannot be provided, sorry)

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fcbb15aa5fe in __restore_sigs () from ./libc.so
[Current thread is 1 (LWP 18313)]
(gdb) bt
#0  0x00007fcbb15aa5fe in __restore_sigs () from ./libc.so
#1  0x00007fcbb15aa778 in raise () from ./libc.so
#2  0x0000000000b81e0f in (anonymous namespace)::reraise_signal(int, crash_handler_data_t*) ()
#3  0x0000000000b82055 in crash_handler(int, siginfo_t*, void*) ()
#4  <signal handler called>
#5  0x000000000086817a in auto_complete::handle_completion(std::shared_ptr<msvc::file_buffer_snap_t> const&, CompletionParams const&, unsigned int, bool&) ()
#6  0x000000000098bdb9 in cpptools_context::textDocument_completion(CompletionParams&&, unsigned int) ()
#7  0x0000000000996156 in std::_Function_handler<void (), cpptools_context::cpptools_context()::{lambda(lsp_request<CompletionParams, CompletionList>&&)#61}::operator()(lsp_request<CompletionParams, CompletionList>&&) const::{lambda()#1}>::_M_invoke(std::_Any_data const&) ()
#8  0x0000000000905475 in msvc::thread_manager_t::queue_item<msvc::deque_thread<std::function<void ()> >::defer(std::function<void ()>&&)::{lambda()#1}>::operator()() ()
#9  0x0000000001647c46 in msvc::thread_manager_t::do_work(unsigned int) ()
#10 0x000000000165a72c in msvc::thread_helper_t::thread_entry(void*) ()
#11 0x00007fcbb15b65ef in start () from ./libc.so
#12 0x00007fcbb15b8af2 in __clone () from ./libc.so
#13 0x000000000165a710 in ?? ()
#14 0x00007fcbb131fde0 in ?? ()
#15 0x0000000000000000 in ?? ()

[sean-mcmanus]

@x1ntt Is that with 1.26.3 x64 binaries?

[sean-mcmanus]

@x1ntt It doesn't appear to be with the 1.26.3 x64 binary.