https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69539
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
That's weird, I can still reproduce:
$ xgcc -flto -fsanitize=null -c -o test test.c
$ xgcc -flto test
include/linux/compiler.h: In function ‘__read_once_size_nocheck’:
include/linux/compiler.h:235:44: internal compiler error: in expand_UBSAN_NULL,
at internal-fn.c:204
0xa1a4bd expand_UBSAN_NULL
/home/marek/src/gcc/gcc/internal-fn.c:204
0xa22ce3 expand_internal_call(internal_fn, gcall*)
/home/marek/src/gcc/gcc/internal-fn.c:2405
0xa22d0e expand_internal_call(gcall*)
/home/marek/src/gcc/gcc/internal-fn.c:2413
0x786336 expand_call_stmt
/home/marek/src/gcc/gcc/cfgexpand.c:2579
0x789cf8 expand_gimple_stmt_1
/home/marek/src/gcc/gcc/cfgexpand.c:3580
0x78a3ee expand_gimple_stmt
/home/marek/src/gcc/gcc/cfgexpand.c:3746
0x791c67 expand_gimple_basic_block
/home/marek/src/gcc/gcc/cfgexpand.c:5753
0x7937e3 execute
/home/marek/src/gcc/gcc/cfgexpand.c:6367
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error: /home/marek/x/trunk/gcc/xgcc returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
