cpptools-srv crashes on Linux in form_exception_specification_for_generated_function

[wj32]

Type: LanguageService

Describe the bug

• OS and Version: Ubuntu 14.04.5
• VS Code Version: 1.51.1
• C/C++ Extension Version: 1.1.1
• Other extensions you installed (and if the issue persists after disabling them): Not relevant
• Does this issue involve using SSH remote to run the extension on a remote machine?: Yes
• A clear and concise description of what the bug is, including information about the workspace (i.e. is the workspace a single project or multiple projects, size of the project, etc). One big project.

Steps to reproduce

I don't have a minimal repro. I'm working on a large C++20 codebase. I see coredumps being generated whenever I try to go to a symbol's definition.

Expected behavior

Logs

Insert logs here.

Screenshots

Additional context

I am not permitted to share coredumps. But here is the stack trace.

Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000000000067d4fe in form_exception_specification_for_generated_function(a_routine*, a_symbol*) ()
[Current thread is 1 (Thread 0x7fc00b7fe700 (LWP 50494))]
(gdb) bt
#0 0x000000000067d4fe in form_exception_specification_for_generated_function(a_routine*, a_symbol*) ()
#1 0x000000000067d341 in complete_defaulted_exc_spec(a_routine*) ()
#2 0x0000000000977aa0 in is_non_throwing_routine(a_routine*) ()
#3 0x00000000008095f7 in examine_expr_for_throwing_exception(an_expr_node*, an_expr_or_stmt_traversal_block*) ()
#4 0x000000000082bddc in traverse_expr(an_expr_node*, an_expr_or_stmt_traversal_block*) ()
#5 0x0000000000800e41 in expr_might_throw(an_expr_node*) ()
#6 0x00000000007cb4d6 in check_requirement_expr(an_expr_node*, Dyn_array<a_subst_pairs_descr, FE_allocator> const&, a_ctws_state*, int, int*) ()
#7 0x00000000007cb0d2 in requires_expr_satisfied(an_expr_node*, Dyn_array<a_subst_pairs_descr, FE_allocator> const&) ()
#8 0x00000000007fbc80 in copy_template_param_expr(an_expr_node*, a_template_arg*, a_template_param*, a_type*, a_source_position*, int, int*, a_ctws_state*, a_constant*, a_constant**) ()
#9 0x00000000007cab0a in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#10 0x00000000007caa70 in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#11 0x00000000007fc600 in copy_template_param_expr(an_expr_node*, a_template_arg*, a_template_param*, a_type*, a_source_position*, int, int*, a_ctws_state*, a_constant*, a_constant**) ()
#12 0x00000000007a8d4a in make_rescan_operand_full(an_expr_node*, a_rescan_control_block*, int, an_operand*, an_operand*) ()
#13 0x00000000007a954a in make_rescan_operands(a_rescan_control_block*, an_operand*, an_operand*, an_operand*, a_source_position*, unsigned int*, a_source_position*) ()
#14 0x0000000000777fc0 in scan_arith_prefix_operator(a_rescan_control_block*, an_operand*) ()
#15 0x0000000000775129 in rescan_expr_with_substitution_internal(an_expr_node*, a_rescan_control_block*, int, an_operand*, an_operand*, int) ()
#16 0x000000000079145b in rescan_expr_with_substitution(an_expr_node*, a_type*, a_rescan_control_block*, a_constant*) ()
#17 0x00000000007fbafc in copy_template_param_expr(an_expr_node*, a_template_arg*, a_template_param*, a_type*, a_source_position*, int, int*, a_ctws_state*, a_constant*, a_constant**) ()
#18 0x00000000007cab0a in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#19 0x00000000007caa06 in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#20 0x00000000007cb07d in requires_expr_satisfied(an_expr_node*, Dyn_array<a_subst_pairs_descr, FE_allocator> const&) ()
#21 0x00000000007fbc80 in copy_template_param_expr(an_expr_node*, a_template_arg*, a_template_param*, a_type*, a_source_position*, int, int*, a_ctws_state*, a_constant*, a_constant**) ()
#22 0x00000000007cab0a in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#23 0x00000000007caa70 in requires_clause_satisfied(an_expr_node*, a_template_arg*, a_template_param*, a_diag_list*, int*, int*) ()
#24 0x000000000092d426 in requires_constraint_satisfied(a_symbol*, a_requires_clause*, a_template_arg*, int) ()
#25 0x000000000092d2a2 in check_template_constraints(a_symbol*, a_template_arg*, int) ()
#26 0x000000000092d864 in find_template_class_full(a_symbol*, a_template_arg**, int, a_symbol*, int, int, int, int) ()
#27 0x000000000092d58d in find_template_class(a_symbol*, a_template_arg**, int, a_symbol*, int, int, int) ()
#28 0x0000000000884584 in coalesce_template_class_reference(a_symbol*, long long, int*) ()
#29 0x0000000000885479 in coalesce_template_id(a_symbol*, a_token_kind, unsigned int, long long, int, int*) ()
#30 0x000000000086e5ab in f_is_generalized_identifier_start(long long, a_type*) ()
#31 0x00000000007403c5 in decl_specifiers(unsigned long, a_decl_parse_state*, a_decl_pos_block*) ()
#32 0x0000000000711ef8 in type_name_full(a_decl_parse_state*) ()
#33 0x0000000000715e71 in alias_declaration(a_decl_parse_state*, a_source_position*) ()
#34 0x000000000071a075 in scan_nonmember_declaration(a_decl_parse_state*, a_source_range*) ()
#35 0x0000000000721019 in namespace_declaration(a_token_kind*, int, int, a_source_position*, a_symbol**) ()
#36 0x0000000000719298 in scan_nonmember_declaration(a_decl_parse_state*, a_source_range*) ()
#37 0x000000000071ee46 in translation_unit() ()
#38 0x000000000096a2c4 in process_translation_unit(char const*, int, an_exported_template_file*) ()
#39 0x000000000067aa57 in cfe_main(int, char**) ()
#40 0x000000000098bd96 in cfe_main_exception_handler(int, char**) ()
#41 0x000000000067ab66 in edg_main(int, char**) ()
#42 0x0000000000985e68 in edge_compiler_main(int, char const**) ()
#43 0x000000000060ae67 in preparse(int, char const**, a_scout_store*, edge::translation_unit*) ()
#44 0x00000000005d33ef in a_compiler_thread::compiler_thread_routine(a_compiler_thread*) ()
#45 0x0000000000ac2f60 in execute_native_thread_routine ()
#46 0x00007fc15150d184 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#47 0x00007fc15123a03d in clone () from /lib/x86_64-linux-gnu/libc.so.6

[sean-mcmanus]

Thanks for reporting this. We're working on improving the stability of IntelliSense with C++20. This specific crash is not currently on our radar to fix yet, but we'll continue to monitor its impact. We would also probably need to find an isolated repro.

[github-actions]

This issue has been closed automatically because it needs more information and has not had recent activity.