Subject: Re: bug#55441: [cuirass] hang in "In progress..."; runs out of pgsql connections

From: Ludovic Courtès <[email-masked]>
Date: Wed, 25 May 2022 20:21:29 +0200

For now, I’m going to go with the solution below, which is to use an
older revision of Guix (one where ‘open-inferior’ was using
‘open-pipe*’) as the dependency of the ‘cuirass’ package.

I’m running “cuirass evaluate” manually on berlin to make sure it
actually works.  If everything goes well, I’ll push it and reconfigure
berlin later today or tomorrow.

Ludo’.

diff --git a/gnu/packages/ci.scm b/gnu/packages/ci.scm
index ab421fe870..9cd2f6884e 100644
--- a/gnu/packages/ci.scm
+++ b/gnu/packages/ci.scm
@@ -164,7 +164,14 @@ (define-public cuirass
              ;; FIXME: this is propagated by "guile-git", but it needs to be among
              ;; the inputs to add it to GUILE_LOAD_PATH.
              guile-bytestructures
-             guix))
+
+             ;; FIXME: The 'cuirass evaluate' command is multithreaded, but it
+             ;; uses 'open-inferior', which calls 'primitive-fork', thus
+             ;; potentially creating child processes that deadlock.  To work
+             ;; around that, use the last revision of Guix where
+             ;; 'open-inferior' was using 'open-pipe*' rather than
+             ;; 'primitive-fork'.  See <https://issues.guix.gnu.org/55441>.
+             guix-for-cuirass))
       (native-inputs
        (list autoconf automake pkg-config texinfo ephemeralpg))
       (native-search-paths
diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index 619458a0d3..16ad4fe9db 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -489,6 +489,30 @@ (define code
       (license license:gpl3+)
       (properties '((ftp-server . "alpha.gnu.org"))))))
 
+(define-public guix-for-cuirass
+  ;; Known-good revision before commit
+  ;; bd86bbd300474204878e927f6cd3f0defa1662a5, which introduced
+  ;; 'primitive-fork' in 'open-inferior'.
+  (let ((version "1.3.0")
+        (commit "a27e47f9d1e22dc32bb250cfeef88cfacb930e23")
+        (revision 23))
+    (package
+      (inherit guix)
+      (version (string-append version "-"
+                              (number->string revision)
+                              "." (string-take commit 7)))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://git.savannah.gnu.org/git/guix.git")
+                      (commit commit)))
+                (sha256
+                 (base32
+                  "12jmvagbw05hmmlrb82i0qazhlv7mcfnl4dmknwx3a9hd760g9y1"))
+                (file-name (string-append "guix-" version "-checkout"))))
+      (properties `((hidden? . #t)
+                    ,@(package-properties guix))))))
+
 (define-public guix-daemon
   ;; This package is for internal consumption: it allows us to quickly build
   ;; the 'guix-daemon' program and use that in (guix self), used by 'guix