Dovecot 2.4.5-1 ftbfs on loong64.  The build appears to complete
successfully, but the test suite fails.

Full buildd log is at
https://buildd.debian.org/status/fetch.php?pkg=dovecot&arch=loong64&ver=1%3A2.4.5%2Bdfsg1-1&stamp=1788231491&raw=0&pow_referer=
and the relevant failure is logged as:

ostream multiplex stream (backpressure): sub-process ended properly .. : FAILED
Warning: test: Sub-process forcibly terminated with signal 9
ostream multiplex stream (backpressure) .............................. : FAILED

The code that is timing out contains the following description:

/* Once the socket is congested the channel must apply backpressure so
   o_stream_send_istream() stops and waits (WAIT_OUTPUT), instead of buffering
   the whole body into the parent without bound and busy-looping a writev() on
   the full socket. A regression either busy-loops forever (never returns) or
   swallows the whole body (FINISHED) - the first is caught by the subprocess
   watchdog killing the hung child, the second by the assertions below failing
   in the child. Either way the parent test fails cleanly. */

I've tried bumping the timeout to see if this is simply a matter of an
overly aggressive watchdog, but it doesn't seem to be the case.  The process
seems to hang indefinitely, which suggests a regression according to the
above comment.  It's not clear why this would be architecture specific,
though.

The problem is 100% reproducible on porter boxes.

We believe that the bug you reported is fixed in the latest version of
dovecot, 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 1146490@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Noah Meyerhans <noahm@debian.org> (supplier of updated dovecot 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: Wed, 02 Sep 2026 12:17:57 -0400
Source: dovecot
Architecture: source
Version: 1:2.4.5+dfsg1-2
Distribution: unstable
Urgency: medium
Maintainer: Dovecot Maintainers <dovecot@packages.debian.org>
Changed-By: Noah Meyerhans <noahm@debian.org>
Closes: 1146449 1146490
Changes:
 dovecot (1:2.4.5+dfsg1-2) unstable; urgency=medium
 .
   * [8b432dd] lib: xxh64: fix byte ordering issue on big-endian systems
     (Closes: #1146449)
   * [45b5e14] Fix loong64 ftbfs (Closes: #1146490)
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