https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117802
Bug ID: 117802
Summary: ICE: SIGSEGV in fold_convert_loc (fold-const.cc:2626)
with __builtin_iseqsig() on _BitInt()
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 59719
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59719&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc testcase.c -wrapper valgrind,-q,--num-callers=100
==26147== Invalid read of size 2
==26147== at 0x120CE0E: fold_convert_loc(unsigned int, tree_node*,
tree_node*) (fold-const.cc:2626)
==26147== by 0x103F1D3: fold_builtin_iseqsig(unsigned int, tree_node*,
tree_node*) (builtins.cc:9953)
==26147== by 0x104D780: fold_builtin_2 (builtins.cc:10699)
==26147== by 0x104D780: fold_builtin_n(unsigned int, tree_node*, tree_node*,
tree_node**, int, bool) [clone .isra.0] (builtins.cc:10819)
==26147== by 0x11ED75A: fold_build_call_array_loc(unsigned int, tree_node*,
tree_node*, int, tree_node**) (fold-const.cc:14477)
==26147== by 0xF194CC: build_function_call_vec(unsigned int, vec<unsigned
int, va_heap, vl_ptr>, tree_node*, vec<tree_node*, va_gc, vl_embed>*,
vec<tree_node*, va_gc, vl_embed>*, tree_node*) (c-typeck.cc:3865)
==26147== by 0xF6877D: c_parser_postfix_expression_after_primary(c_parser*,
unsigned int, c_expr) (c-parser.cc:13405)
==26147== by 0xF3FE4E: c_parser_postfix_expression(c_parser*)
(c-parser.cc:12956)
==26147== by 0xF459EA: c_parser_unary_expression(c_parser*)
(c-parser.cc:10367)
==26147== by 0xF4753F: c_parser_cast_expression(c_parser*, c_expr*)
(c-parser.cc:10208)
==26147== by 0xF4782C: c_parser_binary_expression(c_parser*, c_expr*,
tree_node*) (c-parser.cc:9976)
==26147== by 0xF48DD3: c_parser_conditional_expression(c_parser*, c_expr*,
tree_node*) (c-parser.cc:9671)
==26147== by 0xF495C4: c_parser_expr_no_commas(c_parser*, c_expr*,
tree_node*) (c-parser.cc:9584)
==26147== by 0xF4ABA3: c_parser_expression(c_parser*) (c-parser.cc:13545)
==26147== by 0xF4B107: c_parser_expression_conv(c_parser*)
(c-parser.cc:13605)
==26147== by 0xF3CCCE: c_parser_statement_after_labels(c_parser*, bool*,
tree_node*, vec<tree_node*, va_heap, vl_ptr>*, attr_state) (c-parser.cc:7975)
==26147== by 0xF3F9C7: c_parser_compound_statement_nostart(c_parser*)
(c-parser.cc:7536)
==26147== by 0xF3FC64: c_parser_compound_statement(c_parser*, unsigned int*)
(c-parser.cc:6760)
==26147== by 0xF3B444: c_parser_declaration_or_fndef(c_parser*, bool, bool,
bool, bool, bool, bool, tree_node**, vec<c_token, va_heap, vl_ptr>*, bool,
tree_node*, oacc_routine_data*, bool*) (c-parser.cc:3071)
==26147== by 0xF7508D: c_parser_external_declaration(c_parser*)
(c-parser.cc:2067)
==26147== by 0xF75B15: c_parser_translation_unit (c-parser.cc:1921)
==26147== by 0xF75B15: c_parse_file() (c-parser.cc:28878)
==26147== by 0xFF2FE1: c_common_parse_file() (c-opts.cc:1379)
==26147== by 0x1638D9D: compile_file() (toplev.cc:452)
==26147== by 0xEC4FAA: do_compile (toplev.cc:2211)
==26147== by 0xEC4FAA: toplev::main(int, char**) (toplev.cc:2371)
==26147== by 0xEC67FD: main (main.cc:39)
==26147== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==26147==
testcase.c: In function 'foo':
testcase.c:4:3: internal compiler error: Segmentation fault
4 | return __builtin_iseqsig (b, f);
| ^~~~~~
...
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20241126235337-r15-5714-g2fd9aef1db1a42-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20241126235337-r15-5714-g2fd9aef1db1a42-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241127 (experimental) (GCC)
