Comment 17 for bug 1935617

After some setup and preparation I was bisecting through v5.2.0..v6.0.0 to see which change exactly added this new behavior.

Summary:
 - build reduced qemu
 - build, configure and log-check errors will be skips
 - run the extracted systemd test
 - redirect serial to file
 - check log if the service failed
 - unlikely to be related, but to be sure I as using the same slof.bin on all runs
 - verified with self-built v5.2.0 (food) and v6.0.0 (bad)

The full log is here:
$ git bisect log
git bisect start
# new: [609d7596524ab204ccd71ef42c9eee4c7c338ea4] Update version for v6.0.0 release
git bisect new 609d7596524ab204ccd71ef42c9eee4c7c338ea4
# old: [553032db17440f8de011390e5a1cfddd13751b0b] Update version for v5.2.0 release
git bisect old 553032db17440f8de011390e5a1cfddd13751b0b
# new: [57206696058e3a8b1ee6ec8a129722baa6e7ec9f] hw/block/nvme: merge implicitly/explicitly opened processing masks
git bisect new 57206696058e3a8b1ee6ec8a129722baa6e7ec9f
# new: [4663b72a48fd540cbe16053b01d6839a95656440] intc/arm_gic: Fix gic_irq_signaling_enabled() for vCPUs
git bisect new 4663b72a48fd540cbe16053b01d6839a95656440
# new: [55810e90cc9a5ca18289c25aa5c1e0e2dc77eadb] ppc/spapr: cleanup -machine pseries,nvdimm=X handling
git bisect new 55810e90cc9a5ca18289c25aa5c1e0e2dc77eadb
# old: [cd08b80952657ab9f9ca5b8f374982d9c3159f4a] Replace HTTP links with HTTPS ones: documentation
git bisect old cd08b80952657ab9f9ca5b8f374982d9c3159f4a
# old: [5f3013654e879bb4b22876617fdb235aa22568d3] target/mips: Remove unused headers from op_helper.c
git bisect old 5f3013654e879bb4b22876617fdb235aa22568d3
# new: [ab32b78cd1b3b31950c4332f0fa8b192295d77fd] audio: Simplify audio_bug() removing old code
git bisect new ab32b78cd1b3b31950c4332f0fa8b192295d77fd
# new: [711dfb2423a85fba91884b5a90a8c0712c152ce2] hw/ppc: Do not re-read the clock on pre_save if doing savevm
git bisect new 711dfb2423a85fba91884b5a90a8c0712c152ce2
# old: [cf77e27f1e16d8eca761e5c966ea80291254a32c] target/ppc: replaced the TODO with LOG_UNIMP and add break for silence warnings
git bisect old cf77e27f1e16d8eca761e5c966ea80291254a32c
# new: [728aa6f6ffd8cf21d9485eff7ac1926b00155ed2] hw/ppc/spapr_tpm_proxy: Fix hexadecimal format string specifier
git bisect new 728aa6f6ffd8cf21d9485eff7ac1926b00155ed2
# old: [132954a8307635c08c8e3c4d63d4af9fa865a459] ppc/translate: Turn the helper macros into functions
git bisect old 132954a8307635c08c8e3c4d63d4af9fa865a459
# old: [91699dbf30a94dea2575ae193412c364c7f3a5fd] ppc/translate: Raise exceptions after setting the cc
git bisect old 91699dbf30a94dea2575ae193412c364c7f3a5fd
# new: [bcb0b7b1a1c05707304f80ca6f523d557816f85c] ppc/translate: Rewrite gen_lxvdsx to use gvec primitives
git bisect new bcb0b7b1a1c05707304f80ca6f523d557816f85c
# first new commit: [bcb0b7b1a1c05707304f80ca6f523d557816f85c] ppc/translate: Rewrite gen_lxvdsx to use gvec primitives