jemalloc: skip extent test with profiling enabled (#540203)

pkgs/by-name/je/jemalloc/package.nix

@@ -51,6 +51,14 @@ stdenv.mkDerivation (finalAttrs: {
     # `rtree_read.constprop.0` shows up in some builds but
     # not others, so we fall back to O2:
     ./o3-to-o2.patch
+
+    # Active profiling may make xallocx decline to grow non-page-aligned
+    # allocations, so test/integration/extent can observe decommit without
+    # the matching commit on platforms with real decommit/commit.
+    #
+    # A (longer) patch addressing the failure posted upstream at:
+    # https://github.com/jemalloc/jemalloc/pull/2954
+    ./skip-extent-test-with-prof-active.patch
   ];
 
   nativeBuildInputs = [

pkgs/by-name/je/jemalloc/skip-extent-test-with-prof-active.patch

@@ -0,0 +1,24 @@
+diff --git a/test/integration/extent.sh b/test/integration/extent.sh
+index 39fb0a73..ee9f3ed4 100644
+--- a/test/integration/extent.sh
++++ b/test/integration/extent.sh
+@@ -1,5 +1,19 @@
+ #!/bin/sh
+ 
++# With active profiling, xallocx may decline to grow non-page-aligned
++# allocations.  On platforms with real decommit/commit, this can make this
++# test observe a successful decommit without the matching commit.
++case ",${MALLOC_CONF_ALL}," in
++  *,prof:true,*)
++    case ",${MALLOC_CONF_ALL}," in
++      *,prof_active:false,*)
++        ;;
++      *)
++        return 1
++        ;;
++    esac
++esac
++
+ if [ "x${enable_fill}" = "x1" ] ; then
+   export MALLOC_CONF="junk:false"
+ fi