3 files changed, 24 insertions, 2 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index a0e013aead..99baddea92 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -977,6 +977,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/guile-1.8-cpp-4.5.patch			\
   %D%/packages/patches/guile-2.2-default-utf8.patch		\
   %D%/packages/patches/guile-2.2-skip-oom-test.patch            \
+  %D%/packages/patches/guile-3.0-crash.patch			\
   %D%/packages/patches/guile-default-utf8.patch			\
   %D%/packages/patches/guile-gdbm-ffi-support-gdbm-1.14.patch	\
   %D%/packages/patches/guile-linux-syscalls.patch		\
diff --git a/gnu/packages/guile.scm b/gnu/packages/guile.scm
index 3116f3c30a..1d9d93d774 100644
--- a/gnu/packages/guile.scm
+++ b/gnu/packages/guile.scm
@@ -292,14 +292,18 @@ without requiring the source code to be rewritten.")
   (package
     (inherit guile-2.2)
     (name "guile-next")                           ;to be renamed to "guile"
-    (version "3.0.0")
+    (version "3.0.1")
     (source (origin
               (inherit (package-source guile-2.2))
               (uri (string-append "mirror://gnu/guile/guile-"
                                   version ".tar.xz"))
               (sha256
                (base32
-                "0x8ca6q1qdmk29lh12gj6ngvgn7kp79w42rxfgwrpxm9jmjqs4y9"))))
+                "1jakps3127h8g69ixgb4zwc8v2g29dmwql1vi3pwg30kzp8fm5nn"))
+              (patches
+               (append (search-patches "guile-3.0-crash.patch")
+                       (origin-patches (package-source guile-2.2))))))
+
     (arguments
      (substitute-keyword-arguments (package-arguments guile-2.2)
        ;; XXX: On ARMv7, work around <https://bugs.gnu.org/39208> by disabling
diff --git a/gnu/packages/patches/guile-3.0-crash.patch b/gnu/packages/patches/guile-3.0-crash.patch
new file mode 100644
index 0000000000..510834ab57
--- /dev/null
+++ b/gnu/packages/patches/guile-3.0-crash.patch
@@ -0,0 +1,17 @@
+Fix crash due to: <https://issues.guix.gnu.org/issue/39266>.
+
+diff --git a/libguile/struct.c b/libguile/struct.c
+index 3dbcc71d4..ddcbe46d2 100644
+--- a/libguile/struct.c
++++ b/libguile/struct.c
+@@ -139,7 +139,9 @@ set_vtable_access_fields (SCM vtable)
+   nfields = len / 2;
+ 
+   bitmask_size = (nfields + 31U) / 32U;
+-  unboxed_fields = scm_gc_malloc_pointerless (bitmask_size, "unboxed fields");
++  unboxed_fields =
++    scm_gc_malloc_pointerless (bitmask_size * sizeof (*unboxed_fields),
++                               "unboxed fields");
+   memset (unboxed_fields, 0, bitmask_size * sizeof(*unboxed_fields));
+ 
+   /* Update FLAGS according to LAYOUT.  */