bug#47176: QEMU 5.2.0 doesn't build reproducibly [regression]

[Maxim Cournoyer]

QEMU 5.1.0 builds reproducibly, but 5.2.0 doesn't.

Here's a summary of the differing files:

--8<---------------cut here---------------start------------->8---
Here's a summary of the differing files:

$ diff -r /gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0{,-check}
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-aarch64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-aarch64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-aarch64_be and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-aarch64_be
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-alpha and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-alpha 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-arm and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-arm differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-armeb and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-armeb 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-cris and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-cris 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-edid and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-edid 
differ
Binary files /gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-ga 
and /gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-ga 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-hppa and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-hppa 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-i386 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-i386 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-img and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-img differ
Binary files /gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-io 
and /gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-io 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-keymap and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-keymap 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-m68k and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-m68k 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-microblaze and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-microblaze
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-microblazeel 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-microblazeel
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mips and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mips 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mips64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mips64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mips64el and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mips64el 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mipsel and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mipsel 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mipsn32 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mipsn32 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-mipsn32el and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-mipsn32el 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-nbd and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-nbd differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-nios2 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-nios2 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-or1k and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-or1k 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-ppc and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-ppc differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-ppc64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-ppc64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-ppc64le and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-ppc64le 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-pr-helper and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-pr-helper 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-riscv32 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-riscv32 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-riscv64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-riscv64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-s390x and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-s390x 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-sh4 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-sh4 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-sh4eb and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-sh4eb 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-sparc and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-sparc 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-sparc32plus and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-sparc32plus
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-sparc64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-sparc64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-storage-daemon 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-storage-daemon
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-aarch64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-aarch64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-alpha 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-alpha
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-arm and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-arm
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-avr and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-avr
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-cris and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-cris
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-hppa and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-hppa
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-i386 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-i386
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-m68k and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-m68k
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-microblaze
 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-microblaze
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-microblazeel
 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-microblazeel
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-mips and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-mips
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-mips64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-mips64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-mips64el 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-mips64el
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-mipsel 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-mipsel
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-moxie 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-moxie
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-nios2 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-nios2
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-or1k and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-or1k
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-ppc and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-ppc
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-ppc64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-ppc64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-riscv32 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-riscv32
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-riscv64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-riscv64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-rx and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-rx 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-s390x 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-s390x
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-sh4 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-sh4
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-sh4eb 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-sh4eb
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-sparc 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-sparc
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-sparc64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-sparc64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-tricore 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-tricore
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-x86_64 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-x86_64
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-xtensa 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-xtensa
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-system-xtensaeb 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-system-xtensaeb
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-x86_64 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-x86_64 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-xtensa and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-xtensa 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/bin/qemu-xtensaeb and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/bin/qemu-xtensaeb 
differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/libexec/qemu-bridge-helper
 and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/libexec/qemu-bridge-helper
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/libexec/vhost-user-gpu 
and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/libexec/vhost-user-gpu
 differ
Binary files 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0/libexec/virtiofsd and 
/gnu/store/l286mbanw78qgbn54gs5j23qm0v9abhw-qemu-5.2.0-check/libexec/virtiofsd 
differ
--8<---------------cut here---------------end--------------->8---

The upstream bug I also reported contains an attachment of a
diffoscope-produced log for the qemu-aarch64 binary:
https://bugs.launchpad.net/qemu/+bug/1919253.

Maxim