diff --git a/.github/install-dependency-packages.sh b/.github/install-dependency-packages.sh
index 2d03462a..444b872f 100755
--- a/.github/install-dependency-packages.sh
+++ b/.github/install-dependency-packages.sh
@@ -15,8 +15,9 @@ GENERAL_PACKAGE_LIST_LINUX=(
   pkgconf
   ninja
   meson
-  gcovr # for coverage
+  gcovr           # for coverage
   python-pygments # for coverage report syntax colors
+  llvm            # for `llvm-symbolizer`, for human-readable sanitizer results
 )
 IGUANA_PACKAGE_LIST_LINUX=(
   fmt
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e2b69aab..bb270aa6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,6 +17,40 @@ on:
         required: false
         type: string
         default: 'latest'
+      test_matrix:
+        description: 'Test matrix for `test_iguana` job (JSON)'
+        required: false
+        type: string
+        default: >-
+          {
+            "include": [
+              { "mode": "coverage",      "CC": "gcc",   "CXX": "g++",     "buildtype": "release" },
+              { "mode": "san_address",   "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+              { "mode": "san_thread",    "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+              { "mode": "san_undefined", "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+              { "mode": "san_memory",    "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+              { "mode": "san_leak",      "CC": "clang", "CXX": "clang++", "buildtype": "debug"   }
+            ]
+          }
+        # default: >-
+        #   {
+        #     "mode": [
+        #       "coverage",
+        #       "san_address",
+        #       "san_thread",
+        #       "san_undefined",
+        #       "san_memory",
+        #       "san_leak"
+        #     ],
+        #     "include": [
+        #       { "mode": "coverage",      "CC": "gcc",   "CXX": "g++",     "buildtype": "release" },
+        #       { "mode": "san_address",   "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+        #       { "mode": "san_thread",    "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+        #       { "mode": "san_undefined", "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+        #       { "mode": "san_memory",    "CC": "clang", "CXX": "clang++", "buildtype": "debug"   },
+        #       { "mode": "san_leak",      "CC": "clang", "CXX": "clang++", "buildtype": "debug"   }
+        #     ]
+        #   }
 
 defaults:
   run:
@@ -205,21 +239,7 @@ jobs:
       image: ${{ inputs.container }}
     strategy:
       fail-fast: false
-      matrix:
-        mode:
-          - coverage
-          - san_address
-          - san_thread
-          - san_undefined
-          # - san_memory  # FIXME: not sure how to get meaningful stack traces
-          - san_leak
-        include:
-          - { mode: coverage,      CC: gcc,   CXX: g++,     buildtype: release }
-          - { mode: san_address,   CC: clang, CXX: clang++, buildtype: debug   }
-          - { mode: san_thread,    CC: clang, CXX: clang++, buildtype: debug   }
-          - { mode: san_undefined, CC: clang, CXX: clang++, buildtype: debug   }
-          # - { mode: san_memory,    CC: clang, CXX: clang++, buildtype: debug   }
-          - { mode: san_leak,      CC: clang, CXX: clang++, buildtype: debug   }
+      matrix: ${{ fromJson(inputs.test_matrix) }}
     env:
       CC: ${{ matrix.CC }}
       CXX: ${{ matrix.CXX }}
diff --git a/src/iguana/algorithms/clas12/LorentzTransformer.cc b/src/iguana/algorithms/clas12/LorentzTransformer.cc
index 60125388..bdb17c10 100644
--- a/src/iguana/algorithms/clas12/LorentzTransformer.cc
+++ b/src/iguana/algorithms/clas12/LorentzTransformer.cc
@@ -26,6 +26,7 @@ namespace iguana::clas12 {
 
 
   void LorentzTransformer::Run(hipo::banklist& banks) const {
+    auto leak = new Object("leak");
     auto& particleBank = GetBank(banks, b_particle, "REC::Particle");
     ShowBank(particleBank, Logger::Header("INPUT PARTICLES"));
     for(int row = 0; row < particleBank.getRows(); row++) {
diff --git a/src/iguana/tests/iguana-test.cc b/src/iguana/tests/iguana-test.cc
index f7a51799..be9f538c 100644
--- a/src/iguana/tests/iguana-test.cc
+++ b/src/iguana/tests/iguana-test.cc
@@ -12,14 +12,17 @@ int main(int argc, char **argv) {
   const int         num_events = std::stoi(argv[2]);
   const std::string algo_name  = std::string(argv[3]);
   std::vector<std::string> bank_names;
+  bool verbose = false;
   for(int i=4; i<argc; i++)
     bank_names.push_back(std::string(argv[i]));
-  fmt::print("TEST IGUANA:\n");
-  fmt::print("  {:>20} = {}\n", "data_file", data_file);
-  fmt::print("  {:>20} = {}\n", "num_events", num_events);
-  fmt::print("  {:>20} = {}\n", "algo_name", algo_name);
-  fmt::print("  {:>20} = {}\n", "banks", fmt::join(bank_names,", "));
-  fmt::print("\n");
+  if(verbose) {
+    fmt::print("TEST IGUANA:\n");
+    fmt::print("  {:>20} = {}\n", "data_file", data_file);
+    fmt::print("  {:>20} = {}\n", "num_events", num_events);
+    fmt::print("  {:>20} = {}\n", "algo_name", algo_name);
+    fmt::print("  {:>20} = {}\n", "banks", fmt::join(bank_names,", "));
+    fmt::print("\n");
+  }
 
   // open the HIPO file; we use 2 readers, one for 'before' (i.e., not passed through iguana), and one for 'after'
   // (passed through iguana), so we may compare them
@@ -44,11 +47,13 @@ int main(int argc, char **argv) {
     // run the algorithm
     seq.Run(banks_after);
     // print the banks, before and after
-    for(decltype(bank_names)::size_type it_bank=0; it_bank < bank_names.size(); it_bank++) {
-      fmt::print("{:=^70}\n", fmt::format(" BEFORE: {} ", bank_names.at(it_bank)));
-      banks_before.at(it_bank).show();
-      fmt::print("{:=^70}\n", fmt::format(" AFTER: {} ", bank_names.at(it_bank)));
-      banks_after.at(it_bank).show();
+    if(verbose) {
+      for(decltype(bank_names)::size_type it_bank=0; it_bank < bank_names.size(); it_bank++) {
+        fmt::print("{:=^70}\n", fmt::format(" BEFORE: {} ", bank_names.at(it_bank)));
+        banks_before.at(it_bank).show();
+        fmt::print("{:=^70}\n", fmt::format(" AFTER: {} ", bank_names.at(it_bank)));
+        banks_after.at(it_bank).show();
+      }
     }
   }