https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127545
Bug ID: 127545
Summary: [14/15/16/17 Regression] ICE: verify_flow_info failed:
returns_twice call is not first in basic block 2 with
recursive returns_twice function with
-fsanitize-coverage=trace-pc
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 65654
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65654&action=edit
reduced testcase
Testcase is similar to PR123855
Compiler output:
$ x86_64-pc-linux-gnu-gcc -fsanitize-coverage=trace-pc testcase.c
testcase.c: In function 'foo':
testcase.c:1:41: error: returns_twice call is not first in basic block 2
1 | __attribute__((__returns_twice__)) void foo() { foo(); }
| ^~~
foo ();
during GIMPLE pass: sancov_O0
testcase.c:1:41: internal compiler error: verify_flow_info failed
0x2c5781d internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0xea611e verify_flow_info()
/repo/gcc-trunk/gcc/cfghooks.cc:300
0x137b058 execute_function_todo
/repo/gcc-trunk/gcc/passes.cc:2112
0x137b577 execute_todo
/repo/gcc-trunk/gcc/passes.cc:2152
/repo/gcc-trunk/binary-trunk-20260921021818-gb6ae4436d51-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/17.0.0/cc1
-quiet -iprefix
/repo/gcc-trunk/binary-trunk-20260921021818-gb6ae4436d51-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../lib/gcc/x86_64-pc-linux-gnu/17.0.0/
testcase.c -quiet -dumpdir a- -dumpbase testcase.c -dumpbase-ext .c
-mtune=generic -march=x86-64 -fsanitize-coverage=trace-pc -o /tmp/ccx5zPXd.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ 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-20260921021818-gb6ae4436d51-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/17.0.0/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 --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-20260921021818-gb6ae4436d51-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 17.0.0 20260921 (experimental) (GCC)
