https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115791
Bug ID: 115791
Summary: division by zero check missing at optimization levels
-O2 and -O3
Product: gcc
Version: 10.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: bic60176 at gmail dot com
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
Target Milestone: ---
Created attachment 58592
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58592&action=edit
testcase
OS: Ubuntu 22.04.3 LTS
We found a case that UBSAN failed to report division by zero when compiling
with gcc-10.5.0 at optimization levels -O2 and -O3.
$ ../compiler-builds/gcc-10.5.0_build/bin/gcc -fsanitize=undefined
-fsanitize=address -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 -O2
testcase.c -o exec
$ timeout 1s ./exec 2>exec.err
AddressSanitizer:DEADLYSIGNAL
=================================================================
==3701326==ERROR: AddressSanitizer: FPE on unknown address 0x00000040133d (pc
0x00000040133d bp 0x000000000001 sp 0x7fff7c034130 T0) #0 0x40133d in func_1
testcase.c:20 #1 0x40133d in main testcase.c:29 #2 0x7aaedd229d8f in
__libc_start_call_main ../sysdeps/x86/libc-start.c:58 #3 0x7aaedd229e3f in
__libc_start_main_impl ../sysdeps/nptl/libc_start_call_main.h:392 #4 0x4014d4
in _start (./exec23+0x4014d4) AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE testcase.c:20 in func_1 ==3701326==ABORTING
$ ../compiler-builds/gcc-11.4.0_build/bin/gcc -fsanitize=undefined
-fsanitize=address -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 -O2
testcase.c -o exec
$ timeout 1s ./exec 2>exec.err
testcase.c:20:382: runtime error: division by zero
