z3: fix memory corruption (#486655)

pkgs/by-name/z3/z3/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch2,
   python3Packages,
   fixDarwinDylibNames,
   nix-update-script,
@@ -39,6 +40,25 @@ stdenv.mkDerivation (finalAttrs: {
 
   patches = lib.optionals useCmakeBuild [
     ./fix-pkg-config-paths.patch
+    # fix Segmentation fault. See https://github.com/Z3Prover/z3/pull/8264 and
+    # https://github.com/NixOS/nixpkgs/issues/486491
+    (fetchpatch2 {
+      name = "preserve-the-initial-state-of-the-solver.patch";
+      url = "https://github.com/Z3Prover/z3/commit/850a3236adab92f9f6f569ac66ffbb69be179f4c.patch?full_index=1";
+      hash = "sha256-C6p+dj3i3DpOnd2wr+R8ZwClHoMFfk5i5/+JRhTDNcs=";
+    })
+    # needs to include a cosmetic change to apply patch for memory corruption
+    (fetchpatch2 {
+      name = "cosmetic-changes-to-i.patch";
+      url = "https://github.com/Z3Prover/z3/commit/243694379475d983605f87578452a330f3e3b28f.patch?full_index=1";
+      includes = [ "src/api/api_polynomial.cpp" ];
+      hash = "sha256-huo5S73WrFrEEUcaP+1LDQwGwo+n2iYT4x/OjK5rmqQ=";
+    })
+    (fetchpatch2 {
+      name = "fix-memory-corruption.patch";
+      url = "https://github.com/Z3Prover/z3/commit/e7b6f3f33bcc6c88a0f2ace47ff2f09b59239433.patch?full_index=1";
+      hash = "sha256-kEEeod4s8i9SI2e2TFD2U4yd1qEPoGnJOfE0y+1Cq6M=";
+    })
   ];
 
   strictDeps = true;