https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115891
Bug ID: 115891
Summary: [15 regression] libgcrypt tests segfault in
crc32_less_than_16 with LTO
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: lto, wrong-code
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
To reproduce:
```
tar xvf libgcrypt-1.11.0.tar.xz && cd libgcrypt-1.11.0
./configure --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu
--target=i686-pc-linux-gnu CC="gcc -m32" CFLAGS="-O2 -ggdb3 -flto" && make
-j$(nproc) && make -j$(nproc) check TESTS=basic
```
```
$ ~/bugs/libgcrypt/libgcrypt-1.11.0/tests $ gdb --args ./basic
[...]
Program received signal SIGSEGV, Segmentation fault.
0xf7f1644f in crc32_less_than_16 (pcrc=0x592a305c, inbuf=0x56577098 "23456789",
inlen=4, consts=0xf7f8a3d0 <crc24rfc2440_consts>) at
../cipher/crc-intel-pclmul.c:781
781 asm volatile (/* store CRC in input endian */
(gdb) bt
#0 0xf7f1644f in crc32_less_than_16 (pcrc=0x592a305c, inbuf=0x56577098
"23456789", inlen=4, consts=0xf7f8a3d0 <crc24rfc2440_consts>) at
../cipher/crc-intel-pclmul.c:781
#1 _gcry_crc24rfc2440_intel_pclmul (pcrc=0x592a305c, inbuf=0x56577098
"23456789", inlen=4) at ../cipher/crc-intel-pclmul.c:923
#2 _gcry_crc24rfc2440_intel_pclmul (pcrc=0x592a305c, inbuf=0x56577098
"23456789", inlen=4) at ../cipher/crc-intel-pclmul.c:901
#3 crc24rfc2440_write (context=0x592a305c, inbuf_arg=0x56577098, inlen=4) at
../cipher/crc.c:870
#4 0xf7ebc64e in md_write (a=a@entry=0x5928d520, inbuf=0x56577098, inlen=4) at
../cipher/md.c:778
#5 0xf7ebf4a3 in _gcry_md_hash_buffers_extract (algo=304, flags=<optimized
out>, digest=0xffffc7cc, digestlen=3, iov=0xffffc78c, iovcnt=2) at
../cipher/md.c:1368
#6 0xf7ea34f3 in _gcry_md_hash_buffers_extract (algo=304, flags=0,
digest=0xffffc7cc, digestlen=-1, iov=0xffffc77c, iovcnt=3) at
../cipher/md.c:1316
#7 _gcry_md_hash_buffers (algo=304, flags=0, digest=0xffffc7cc,
iov=0xffffc77c, iovcnt=3) at ../cipher/md.c:1399
#8 gcry_md_hash_buffers (algo=304, flags=0, digest=0xffffc7cc, iov=0xffffc77c,
iovcnt=3) at /home/sam/bugs/libgcrypt/libgcrypt-1.11.0/src/visibility.c:1296
#9 0x5656f40a in check_one_md_multi (algo=304, data=<optimized out>,
len=<optimized out>, expect=0x565770db "!\317\002", elen=0, n=0x0, s=0x0)
at /home/sam/bugs/libgcrypt/libgcrypt-1.11.0/tests/basic.c:14023
#10 0x5656fa04 in check_digests () at
/home/sam/bugs/libgcrypt/libgcrypt-1.11.0/tests/basic.c:15524
#11 0x565608f4 in main (argc=<optimized out>, argv=<optimized out>) at
/home/sam/bugs/libgcrypt/libgcrypt-1.11.0/tests/basic.c:18315
(gdb)
```
I'll do the usual to narrow it down now but if the issue is in the inline asm,
I'll need someone to take a look. Thanks.
