[Bug 2123828] Autopkgtest regression report (qemu/1:10.1.0+ds-5ubuntu2.1)

[Ubuntu SRU Bot <2123828@bugs.launchpad.net>]

All autopkgtests for the newly accepted qemu (1:10.1.0+ds-5ubuntu2.1) for questing have finished running.
The following regressions have been reported in tests triggered by the package:

livecd-rootfs/25.10.24 (s390x)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/questing/update_excuses.html#qemu

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/2123828

Title:
  [SRU] RISC-V: incorrect emulation of load and store on big-endian
  systems

Status in QEMU:
  Fix Released
Status in glibc package in Ubuntu:
  Invalid
Status in qemu package in Ubuntu:
  Fix Committed
Status in gcc-15 source package in Noble:
  Invalid
Status in glibc source package in Noble:
  Invalid
Status in qemu source package in Noble:
  In Progress
Status in gcc-15 source package in Plucky:
  Invalid
Status in glibc source package in Plucky:
  Invalid
Status in qemu source package in Plucky:
  In Progress
Status in gcc-15 source package in Questing:
  Invalid
Status in glibc source package in Questing:
  Invalid
Status in qemu source package in Questing:
  Fix Committed
Status in glibc source package in Resolute:
  Invalid
Status in qemu source package in Resolute:
  Fix Committed

Bug description:
  [ Impact ]

  On s390x architecture, qemu cannot emulate riscv64 well because of an
  endianess error. Original bug report :

  QEMU's DEP-8 test fails on s390x, due to warning output on stderr
  about "unsupported version 256 of Verdef record", which is blocking
  migration of glibc 2.42-0ubuntu3.

  DEP-8 logs:
  """
  323s === Checking if /usr/bin/qemu-riscv64 can run executables:
  323s glob with sh: /usr/bin/qemu-riscv64 /bin/busybox ash -c "/usr/bin/qemu-riscv64 /bin/busybox ls -dCFl debian/*[t]*":
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libresolv.so.2: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s
  323s Reading package lists.../bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s Expected output not found
  [...]
  328s autopkgtest [22:14:52]: @@@@@@@@@@@@@@@@@@@@ summary
  328s test-qemu-img.sh     PASS (superficial)
  328s test-qemu-system.sh  PASS (superficial)
  328s test-qemu-user.sh    FAIL stderr: /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  """

  Patched by flagging the faulty instructions with the endianness swap
  marker.

  [ Test Plan ]

  Minimal reproducer: (after booting up an s390x vm)
  ```
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt update && sudo apt install qemu-user
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg -l | grep libc6
  ii  libc6:s390x                           2.42-0ubuntu3
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg -l | grep qemu-user
  ii  qemu-user                             1:10.1.0+ds-5ubuntu1
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg --print-architecture
  s390x
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo dpkg --add-architecture riscv64
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt update
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt install hello:riscv64
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ /usr/bin/qemu-riscv64 /usr/bin/hello
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  ```

  The same thing with the patch shows "Hello, world !".

  [ Where problems could occur ]

  This change is really small (3 lines), and only affects riscv64
  emulation from QEMU. If the fix was entirely wrong, riscv64 emulation
  of compressed instruction could be affected. It can be easily tested.

  The patch was accepted upstream, so such tests are conducted upstream
  as well, which reduces the amount of possible problems and work to do
  to fix those.

  [ Other Info ]

  Patch applied upstream: https://gitlab.com/qemu-project/qemu/-/commit/b25133d38fe693589cf695b85968caa0724bfafd
  Patch available on ppa: https://launchpad.net/~vhaudiquet/+archive/ubuntu/qemu-fix-lp2123828/+packages

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