Dear Michael,

As you pointed out on IRC the qemu autopkgtest sometimes fail on riscv64:

| 717s === Checking if /usr/bin/qemu-arm64 can run executables:
| 717s glob with sh: /usr/bin/qemu-arm64 /bin/busybox ash -c "/usr/bin/qemu-arm64 /bin/busybox ls -dCFl debian/*[t]*":
| 717s /bin/busybox: line 0: can't open ash: no such file
| 717s Expected output not found

The full autopkgtest log is available here:
https://ci.debian.net/data/autopkgtest/testing/riscv64/q/qemu/76104339/log.gz

This happens on hosts with CPU which support vector extension. QEMU
detects it and use it. In this particular case, the RISCV-V vector
instructions are used, among other things, to emulate the aarch64 NEON
instructions.

I have found two issues in the TCG RISC-V backend that explain this
issue. I have submitted them upstream as patches:
- https://lore.kernel.org/qemu-devel/20261008181611.3015838-1-aurelien@aurel32.net/
- https://lore.kernel.org/qemu-devel/20261008181647.3015949-1-aurelien@aurel32.net/

I have tested that they fix the autopkgtest failure. Once accepted
upstream, could you please merge them (or a newer version if needed) in
the Debian package?

Note that the issue also affects the version in trixie, and as hardware
with vector instructions is becoming more common, we might also want to
fix it. The patch applies cleanly after adjusting the paths that got
changed as part of the 32-bit host support removal.

Thanks
Aurelien

This is excellent news!

Let's do it sooner.

Adding
   Cc: qemu-stable@nongnu.org

would do it.  But I'll pick them up without that already.

Thank you!

/mjt

We believe that the bug you reported is fixed in the latest version of
qemu, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1150345@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Tokarev <mjt@tls.msk.ru> (supplier of updated qemu package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Fri, 09 Oct 2026 04:21:14 +0300
Source: qemu
Architecture: source
Version: 1:11.1.2+ds-3
Distribution: unstable
Urgency: medium
Maintainer: Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>
Changed-By: Michael Tokarev <mjt@tls.msk.ru>
Closes: 1150345
Changes:
 qemu (1:11.1.2+ds-3) unstable; urgency=medium
 .
   * two patches from Aurelien Jarno fixing 2 issues in riscv vector extensions
     (and CI failure in debian)  (Closes: #1150345)
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