[Bug c++/99737] [modules] malloc(): smallbin double linked list corrupted

["alexander.lelyakin at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99737

--- Comment #2 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
This error is very unstable. 
Each found sequence is not reproducible after few commits.
But some other sequence appears with similar message.

This time such a sequence is:

/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header algorithm
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header memory
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header thread
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header
condition_variable
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header istream
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header variant
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header functional
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cassert
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cinttypes
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header shared_mutex
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header locale
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header fstream
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cwctype
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header exception
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cstdlib
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header string
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header vector
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cstdio
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header filesystem
----
malloc(): smallbin double linked list corrupted
In file included from /usr/local/include/c++/11.0.1/bits/shared_ptr_base.h:53,
                 from /usr/local/include/c++/11.0.1/bits/shared_ptr.h:53,
                 from /usr/local/include/c++/11.0.1/bits/fs_path.h:46,
                 from /usr/local/include/c++/11.0.1/filesystem:45:
/usr/local/include/c++/11.0.1/bits/allocated_ptr.h: In destructor
‘std::__allocated_ptr<_Alloc>::~__allocated_ptr()’:
/usr/local/include/c++/11.0.1/bits/allocated_ptr.h:73:32: internal compiler
error: Aborted
   73 |           std::allocator_traits<_Alloc>::deallocate(*_M_alloc, _M_ptr,
1);
      |                                ^
0x110151f crash_signal
        ../../gcc/gcc/toplev.c:327
0x1d47510 xrealloc
        ../../gcc/libiberty/xmalloc.c:179
0xa8eb0d void va_heap::reserve<cp_token*>(vec<cp_token*, va_heap, vl_embed>*&,
unsigned int, bool)
        ../../gcc/gcc/vec.h:290
0xa8eb0d vec<cp_token*, va_heap, vl_ptr>::reserve(unsigned int, bool)
        ../../gcc/gcc/vec.h:1778
0xa8eb0d vec<cp_token*, va_heap, vl_ptr>::safe_push(cp_token* const&)
        ../../gcc/gcc/vec.h:1887
0xa8eb0d cp_lexer_save_tokens
        ../../gcc/gcc/cp/parser.c:1241
0xa8eb0d cp_parser_parse_tentatively
        ../../gcc/gcc/cp/parser.c:32847
0xabe86d cp_parser_type_name
        ../../gcc/gcc/cp/parser.c:19219
0xacb256 cp_parser_simple_type_specifier
        ../../gcc/gcc/cp/parser.c:18924
0xaa9e5d cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:18516
0xabbc23 cp_parser_type_specifier_seq
        ../../gcc/gcc/cp/parser.c:23367
0xaba2a4 cp_parser_type_id_1
        ../../gcc/gcc/cp/parser.c:23170
0xabc893 cp_parser_template_type_arg
        ../../gcc/gcc/cp/parser.c:23275
0xabc9bf cp_parser_template_argument
        ../../gcc/gcc/cp/parser.c:17915
0xabc9bf cp_parser_template_argument_list
        ../../gcc/gcc/cp/parser.c:17826
0xabc9bf cp_parser_enclosed_template_argument_list
        ../../gcc/gcc/cp/parser.c:30799
0xabdcec cp_parser_template_id
        ../../gcc/gcc/cp/parser.c:17398
0xabe3eb cp_parser_class_name
        ../../gcc/gcc/cp/parser.c:24692
0xab595a cp_parser_qualifying_entity
        ../../gcc/gcc/cp/parser.c:7002
0xab595a cp_parser_nested_name_specifier_opt
        ../../gcc/gcc/cp/parser.c:6684
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210327 (experimental)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


commit 651684b462f979a4e70a668c4c9767a5fd7d223a (HEAD -> master, origin/trunk,
origin/master, origin/HEAD)
Author: GCC Administrator <gccadmin@gcc.gnu.org>
Date:   Sat Mar 27 00:16:27 2021 +0000

    Daily bump.