Problem running qos-test when building with gcc12 and LTO

[Dario Faggioli]

Hello!

So, in openSUSE Tumbleweed, we configure QEMU with something like this:
[1], and with gcc version 12.1.0.

When I try to use this configuration for building either v7.0.0 or the
current master branch, the build work, but the following tests fail:

- qos-test for i386
- qos-test for x86_64
- qos-test for aarch64
- qos-test for alpha

As soon as I get rid of _both_ "-flto=auto" _and_ "--enable-lto", the
above tests seem to work fine.

When they fail, they fail immediately, while creating the graph, like
this:

MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(( ${RANDOM:-0} % 255 + 1))} 
QTEST_QEMU_IMG=./qemu-img G_TEST_DBUS_DAEMON=../tests/dbus-vmstate-daemon.sh 
QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon 
QTEST_QEMU_BINARY=./qemu-system-x86_64 ./tests/qtest/qos-test --tap -k
# random seed: R02S90d4b61102dd94459f986c2367d6d375
# starting QEMU: exec ./qemu-system-x86_64 -qtest unix:/tmp/qtest-28822.sock 
-qtest-log /dev/null -chardev socket,path=/tmp/qtest-28822.qmp,id=char0 -mon 
chardev=char0,mode=control -display none -machine none -accel qtest
QOSStack: full stack, cannot pushAborted

I'm attaching logs of a GOOD and a BAD run of the following command:

MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(( ${RANDOM:-0} % 255 + 1))} \
  QTEST_QEMU_IMG=./qemu-img G_TEST_DBUS_DAEMON=../tests/dbus-vmstate-daemon.sh \
  QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon \
  QTEST_QEMU_BINARY=./qemu-system-x86_64 ./tests/qtest/qos-test --tap -k 
--debug-log -p

Any hints? Any more or different logs I can collect and provide?

Thanks and Regards

[1]
QEMU_EXTRA_CFLAGS="-O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong 
-funwind-tables \
  -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type 
-flto=auto -g"

./configure \
        --python=/usr/bin/python3 \
        --extra-cflags="$QEMU_EXTRA_CFLAGS" \
        --disable-fuzzing \
        --disable-multiprocess \
        --disable-stack-protector \
        --disable-strip \
        --disable-tcg-interpreter \
        --disable-qom-cast-debug \
        --with-default-devices \
        --enable-system --disable-linux-user \
        --enable-tools --enable-guest-agent \
        --enable-modules \
        --disable-module-upgrades \
        --enable-slirp=system \
        --enable-pie \
        --enable-lto \
        --enable-docs \
        --enable-attr \
        --disable-auth-pam \
        --enable-bochs \
        --enable-brlapi \
        --enable-bzip2 \
        --enable-cap-ng \
        --disable-capstone \
        --enable-cloop \
        --enable-coroutine-pool \
        --disable-crypto-afalg \
        --enable-curl \
        --enable-curses \
        --enable-dmg \
        --enable-fdt \
        --enable-gio \
        --enable-gcrypt \
        --enable-glusterfs \
        --enable-gnutls \
        --enable-gtk \
        --disable-hax \
        --disable-hvf \
        --enable-iconv \
        --enable-kvm \
        --enable-libdaxctl \
        --enable-libiscsi \
        --enable-libnfs \
        --enable-libpmem \
        --enable-libssh \
        --enable-libusb \
        --enable-linux-aio \
        --enable-linux-io-uring \
        --enable-lzfse \
        --enable-lzo \
        --disable-malloc-trim \
        --disable-membarrier \
        --enable-mpath \
        --disable-netmap \
        --disable-nettle \
        --enable-numa \
        --enable-opengl \
        --enable-parallels \
        --disable-plugins \
        --enable-pvrdma \
        --enable-qcow1 \
        --enable-qed \
        --enable-rbd \
        --enable-rdma \
        --enable-replication \
        --disable-safe-stack \
        --disable-sanitizers \
        --disable-sdl \
        --disable-sdl-image \
        --enable-seccomp \
        --enable-smartcard \
        --enable-snappy \
        --enable-spice \
        --enable-tpm \
        --enable-usb-redir \
        --enable-vde \
        --enable-vdi \
        --enable-vhost-kernel \
        --enable-vhost-net \
        --enable-vhost-user \
        --enable-vhost-user-blk-server \
        --enable-vhost-vdpa \
        --enable-virglrenderer \
        --enable-virtfs \
        --enable-vnc \
        --enable-vnc-jpeg \
        --enable-vnc-sasl \
        --enable-vte \
        --enable-vvfat \
        --enable-werror \
        --disable-whpx \
        --enable-zstd \
        --enable-xen \
        --enable-xen-pci-passthrough \
        --enable-xkbcommon

-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
-------------------------------------------------------------------
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qos-test-x86_GOOD.log.txt
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qos-test-x86_BAD.log.txt
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