diff --git a/nixos/release-combined.nix b/nixos/release-combined.nix
index 7f81ca1c69b8..626a16bd9e2d 100644
--- a/nixos/release-combined.nix
+++ b/nixos/release-combined.nix
@@ -156,6 +156,7 @@ in rec {
         (onSystems ["i686-linux"] "nixos.tests.zfs.installer")
         (onFullSupported "nixpkgs.emacs")
         (onFullSupported "nixpkgs.jdk")
+        (onFullSupported "nixpkgs.tests.packageTestsForChannelBlockers.curl.withCheck")
         ["nixpkgs.tarball"]
       ];
     };
diff --git a/nixos/release-small.nix b/nixos/release-small.nix
index 1d51b4e7f28f..bd1e1b95d1fb 100644
--- a/nixos/release-small.nix
+++ b/nixos/release-small.nix
@@ -120,6 +120,7 @@ in rec {
         "nixos.tests.proxy.x86_64-linux"
         "nixos.tests.simple.x86_64-linux"
         "nixpkgs.jdk.x86_64-linux"
+        "nixpkgs.tests.packageTestsForChannelBlockers.curl.withCheck.x86_64-linux"
         "nixpkgs.tarball"
       ];
   };
diff --git a/pkgs/test/default.nix b/pkgs/test/default.nix
index 82975efb5917..f22bf46900ce 100644
--- a/pkgs/test/default.nix
+++ b/pkgs/test/default.nix
@@ -24,6 +24,14 @@ with pkgs;
 
   config = callPackage ./config.nix { };
 
+  # we can't add 'nixpkgs.curl.tests' to hydra jobs due to 'tests' (and 'passthru') being stripped
+  # TODO: add a function in lib-release.nix to get derivations and add `.x86_64-linux` to them
+  # then we can just point release files to nixpkgs.tests.packageTestsForChannelBlockers instead of
+  # nixpkgs.tests.packageTestsForChannelBlockers.curl.withCheck
+  packageTestsForChannelBlockers = recurseIntoAttrs {
+    curl = recurseIntoAttrs pkgs.curl.tests;
+  };
+
   haskell = callPackage ./haskell { };
 
   cc-multilib-gcc = callPackage ./cc-wrapper/multilib.nix { stdenv = gccMultiStdenv; };
diff --git a/pkgs/tools/networking/curl/default.nix b/pkgs/tools/networking/curl/default.nix
index 05e59029f133..38861d36252e 100644
--- a/pkgs/tools/networking/curl/default.nix
+++ b/pkgs/tools/networking/curl/default.nix
@@ -33,6 +33,8 @@
 , ocamlPackages
 , phpExtensions
 , python3
+, tests
+, fetchpatch
 }:
 
 # Note: this package is used for bootstrapping fetchurl, and thus
@@ -61,14 +63,14 @@ assert wolfsslSupport -> wolfssl != null;
 assert zlibSupport -> zlib != null;
 assert zstdSupport -> zstd != null;
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "curl";
   version = "7.84.0";
 
   src = fetchurl {
     urls = [
-      "https://curl.haxx.se/download/${pname}-${version}.tar.bz2"
-      "https://github.com/curl/curl/releases/download/${lib.replaceStrings ["."] ["_"] pname}-${version}/${pname}-${version}.tar.bz2"
+      "https://curl.haxx.se/download/curl-${finalAttrs.version}.tar.bz2"
+      "https://github.com/curl/curl/releases/download/curl-${finalAttrs.version}/curl-${finalAttrs.version}.tar.bz2"
     ];
     sha256 = "sha256-cC+ybnMZCjvXcHGqFG9Qe5gXzE384hjSq4fwDNO8BZ0=";
   };
@@ -149,7 +151,10 @@ stdenv.mkDerivation rec {
   CXX = "${stdenv.cc.targetPrefix}c++";
   CXXCPP = "${stdenv.cc.targetPrefix}c++ -E";
 
-  doCheck = true;
+  # takes 14 minutes on a 24 core and because many other packages depend on curl
+  # they cannot be run concurrently and are a bottleneck
+  # tests are available in passthru.tests.withCheck
+  doCheck = false;
   preCheck = ''
     patchShebangs tests/
   '' + lib.optionalString stdenv.isDarwin ''
@@ -174,16 +179,23 @@ stdenv.mkDerivation rec {
     ln $out/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary} $out/lib/libcurl-gnutls${stdenv.hostPlatform.extensions.sharedLibrary}.4.4.0
   '';
 
-  passthru = {
+  passthru = let
+    useThisCurl = attr: attr.override { curl = finalAttrs.finalPackage; };
+  in {
     inherit opensslSupport openssl;
     tests = {
-      inherit curlpp coeurl;
-      haskell-curl = haskellPackages.curl;
-      ocaml-curly = ocamlPackages.curly;
-      php-curl = phpExtensions.curl;
-      pycurl = python3.pkgs.pycurl;
+      withCheck = finalAttrs.finalPackage.overrideAttrs (_: { doCheck = true; });
+      fetchpatch = tests.fetchpatch.simple.override { fetchpatch = fetchpatch.override { fetchurl = useThisCurl fetchurl; }; };
+      curlpp = useThisCurl curlpp;
+      coeurl = useThisCurl coeurl;
+      haskell-curl = useThisCurl haskellPackages.curl;
+      ocaml-curly = useThisCurl ocamlPackages.curly;
+      pycurl = useThisCurl python3.pkgs.pycurl;
+      php-curl = useThisCurl phpExtensions.curl;
+      # error: attribute 'override' missing
       # Additional checking with support http3 protocol.
-      inherit (nixosTests) nginx-http3;
+      # nginx-http3 = useThisCurl nixosTests.nginx-http3;
+      nginx-http3 = nixosTests.nginx-http3;
     };
   };
 
@@ -196,4 +208,4 @@ stdenv.mkDerivation rec {
     # Fails to link against static brotli or gss
     broken = stdenv.hostPlatform.isStatic && (brotliSupport || gssSupport);
   };
-}
+})
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 41c507a1aed6..ce3af252abc7 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -66,8 +66,8 @@ lib.makeScope pkgs.newScope (self: with self; {
   #
   # Build inputs is used for extra deps that may be needed. And zendExtension
   # will mark the extension as a zend extension or not.
-  mkExtension =
-    { name
+  mkExtension = lib.makeOverridable
+    ({ name
     , configureFlags ? [ "--enable-${name}" ]
     , internalDeps ? [ ]
     , postPhpize ? ""
@@ -151,7 +151,7 @@ lib.makeScope pkgs.newScope (self: with self; {
         description = "PHP upstream extension: ${name}";
         inherit (php.meta) maintainers homepage license;
       };
-    });
+    }));
 
   php = phpPackage;
 
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index bac3d1b1171d..c2d21b196a8a 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -97,6 +97,7 @@ let
               jobs.lib-tests
               jobs.pkgs-lib-tests
               jobs.stdenv.x86_64-linux
+              jobs.tests.packageTestsForChannelBlockers.curl.withCheck.x86_64-linux
               jobs.cargo.x86_64-linux
               jobs.go.x86_64-linux
               jobs.linux.x86_64-linux
@@ -133,6 +134,7 @@ let
             ++ lib.collect lib.isDerivation jobs.stdenvBootstrapTools
             ++ lib.optionals supportDarwin.x86_64 [
               jobs.stdenv.x86_64-darwin
+              jobs.tests.packageTestsForChannelBlockers.curl.withCheck.x86_64-darwin
               jobs.cargo.x86_64-darwin
               jobs.cachix.x86_64-darwin
               jobs.go.x86_64-darwin