[Bug build/31316] New: Fails test misc/tst-dirname "Didn't expect signal from child: got `Illegal instruction'" on non SSE CPUs

[immoloism at googlemail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31316

            Bug ID: 31316
           Summary: Fails test misc/tst-dirname "Didn't expect signal from
                    child: got `Illegal instruction'" on non SSE CPUs
           Product: glibc
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: immoloism at googlemail dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

Created attachment 15345
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15345&action=edit
Build log and out file of test fails

Originally discovered by drumgod on a Celeron Mendocino and then confirmed by
myself on a Pentium 2 (deschutes) which was kindly donated by a Gentoo user to
be used to dig further into this issue.

This currently effects 2.38 and the upcoming 2.39 release however no issue is
found in the releases before these two.

The two fails are:

misc/tst-dirname: Didn't expect signal from child: got `Illegal instruction
misc/tst-glibc-hwcaps-prepend-cache:
tst-glibc-hwcaps-prepend-cache.c:90: numeric comparison failure
   left: 1 (0x1); from: marker1 ()
  right: 2 (0x2); from: 2
tst-glibc-hwcaps-prepend-cache.c:105: numeric comparison failure
   left: 1 (0x1); from: marker1 ()
  right: 2 (0x2); from: 2
tst-glibc-hwcaps-prepend-cache.c:113: numeric comparison failure
   left: 1 (0x1); from: marker1 ()
  right: 3 (0x3); from: 3
error: tst-glibc-hwcaps-prepend-cache.c:122: not true: dlopen (SONAME,
RTLD_NOW) == NULL
tst-glibc-hwcaps-prepend-cache.c:129: numeric comparison failure
   left: 1 (0x1); from: marker1 ()
  right: 2 (0x2); from: 2

I think the first one is the one which is the main issue but included both for
completeness.

On a Gentoo system this can also be reproduced by installing glibc 2.38 then
running "emerge -va nano":

/usr/lib/portage/python3.11/ebuild.sh: line 789:    21 Illegal instruction    
( if [[ -n ${PORTAGE_PIPE_FD} ]]; then
    eval "exec ${PORTAGE_PIPE_FD}>&-"; unset PORTAGE_PIPE_FD;
fi; __ebuild_main ${EBUILD_SH_ARGS}; exit 0 )

dmesg output:

[106071.719000] process 'ld-linux.so.2' launched
'/var/tmp/portage/sys-libs/glibc-9999/temp/testscriptRsIrAs' with NULL argv:
empty string added
[110136.637049] traps: ld-linux.so.2[9275] trap invalid opcode ip:b7e4fc8f
sp:bfa360cc error:0 in libc.so[b7cc7000+194000]
[110326.703936] ld-linux.so.2[9796]: memfd_create() called without MFD_EXEC or
MFD_NOEXEC_SEAL set
[240275.802537] ld-linux.so.2[16706]: segfault at 9393b150 ip b7d814e3 sp
bfc36c40 error 4 in libc.so[b7d02000+193000] likely on CPU 0 (core 0, socket 0)
[240275.802721] Code: 8d 70 08 f7 c6 0f 00 00 00 0f 85 20 0a 00 00 8d 5c 97 04
65 a1 0c 00 00 00 85 c0 0f 85 46 04 00 00 8b 4c 24 18 89 f0 c1 e8 0c <8b> 79 08
8b 4c 24 14 31 f8 89 41 04 8b 44 24 18 8b 40 04 89 44 24
[240275.807617] ld-linux.so.2[16707]: segfault at 151537d0 ip b7d814e3 sp
bfc36c40 error 4 in libc.so[b7d02000+193000] likely on CPU 0 (core 0, socket 0)
[240275.807770] Code: 8d 70 08 f7 c6 0f 00 00 00 0f 85 20 0a 00 00 8d 5c 97 04
65 a1 0c 00 00 00 85 c0 0f 85 46 04 00 00 8b 4c 24 18 89 f0 c1 e8 0c <8b> 79 08
8b 4c 24 14 31 f8 89 41 04 8b 44 24 18 8b 40 04 89 44 24
[264420.901533] traps: ld-linux.so.2[18454] trap invalid opcode ip:b7f0258f
sp:bf80e39c error:0 in libc.so[b7d7b000+193000]
[363201.403362] traps: bash[1205] trap invalid opcode ip:b7dcceb5 sp:bf90298c
error:0 in libc.so.6[b7c46000+193000]
[363357.204421] traps: bash[2431] trap invalid opcode ip:b7e9aeb5 sp:bfb088ac
error:0 in libc.so.6[b7d14000+193000]

I knowing finding one of machines isn't easy but I can arrange for access to be
given although I have found a way to reproduce in QEMU

1. qemu-img create -f qcow2 linux-nosse.qcow2 30G
2. Install distro of choice with the command " 
qemu-system-i386 -cpu pentium2 -enable-kvm -smp 8 -m 3G -cdrom <iso> -drive
file=linux-nosse.qcow2,format=qcow2 -boot d"
3. Once installed boot into the machine with "qemu-system-i386 -cpu pentium2
-smp 8 -m 3G -cdrom <iso> -drive file=linux-nosse.qcow2,format=qcow2 -boot c"
4. Now compile glibc as normal and run "make check".

Gentoo bug: https://bugs.gentoo.org/922497

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