diff --git a/testing/mozharness/mozharness/mozilla/testing/firefox_media_tests.py b/testing/mozharness/mozharness/mozilla/testing/firefox_media_tests.py
index 97a97104c995..eaedde03f56a 100644
--- a/testing/mozharness/mozharness/mozilla/testing/firefox_media_tests.py
+++ b/testing/mozharness/mozharness/mozilla/testing/firefox_media_tests.py
@@ -298,6 +298,7 @@ class FirefoxMediaTestsBase(TestingMixin, VCSToolsScript):
         env = self.query_env()
         if self.query_minidump_stackwalk():
             env['MINIDUMP_STACKWALK'] = self.minidump_stackwalk_path
+        env['RUST_BACKTRACE'] = '1'
 
         if self.config['allow_software_gl_layers']:
             env['MOZ_LAYERS_ALLOW_SOFTWARE_GL'] = '1'
diff --git a/testing/mozharness/mozharness/mozilla/testing/firefox_ui_tests.py b/testing/mozharness/mozharness/mozilla/testing/firefox_ui_tests.py
index 684ec3a7339b..89d166578efa 100644
--- a/testing/mozharness/mozharness/mozilla/testing/firefox_ui_tests.py
+++ b/testing/mozharness/mozharness/mozilla/testing/firefox_ui_tests.py
@@ -241,6 +241,7 @@ class FirefoxUITests(TestingMixin, VCSToolsScript):
         env.update({'MINIDUMP_SAVE_PATH': dirs['abs_blob_upload_dir']})
         if self.query_minidump_stackwalk():
             env.update({'MINIDUMP_STACKWALK': self.minidump_stackwalk_path})
+        env['RUST_BACKTRACE'] = '1'
 
         if self.config['allow_software_gl_layers']:
             env['MOZ_LAYERS_ALLOW_SOFTWARE_GL'] = '1'
diff --git a/testing/mozharness/mozharness/mozilla/testing/talos.py b/testing/mozharness/mozharness/mozilla/testing/talos.py
index e8b37223372d..a29ac0892c7c 100755
--- a/testing/mozharness/mozharness/mozilla/testing/talos.py
+++ b/testing/mozharness/mozharness/mozilla/testing/talos.py
@@ -437,6 +437,7 @@ class Talos(TestingMixin, MercurialScript, BlobUploadMixin, TooltoolMixin):
         if not self.run_local:
             env['MINIDUMP_STACKWALK'] = self.query_minidump_stackwalk()
         env['MINIDUMP_SAVE_PATH'] = self.query_abs_dirs()['abs_blob_upload_dir']
+        env['RUST_BACKTRACE'] = '1'
         if not os.path.isdir(env['MOZ_UPLOAD_DIR']):
             self.mkdir_p(env['MOZ_UPLOAD_DIR'])
         env = self.query_env(partial_env=env, log_level=INFO)
diff --git a/testing/mozharness/scripts/android_emulator_unittest.py b/testing/mozharness/scripts/android_emulator_unittest.py
index 632226689c68..ec2ad0f89e59 100644
--- a/testing/mozharness/scripts/android_emulator_unittest.py
+++ b/testing/mozharness/scripts/android_emulator_unittest.py
@@ -761,6 +761,7 @@ class AndroidEmulatorTest(BlobUploadMixin, TestingMixin, EmulatorMixin, VCSMixin
             env['MINIDUMP_STACKWALK'] = self.minidump_stackwalk_path
         env['MOZ_UPLOAD_DIR'] = self.query_abs_dirs()['abs_blob_upload_dir']
         env['MINIDUMP_SAVE_PATH'] = self.query_abs_dirs()['abs_blob_upload_dir']
+        env['RUST_BACKTRACE'] = '1'
 
         self.info("Running on %s the command %s" % (self.emulator["name"], subprocess.list2cmdline(cmd)))
         self.info("##### %s log begins" % self.test_suite)
diff --git a/testing/mozharness/scripts/desktop_unittest.py b/testing/mozharness/scripts/desktop_unittest.py
index a5c0f14d24a5..befad6aaa370 100755
--- a/testing/mozharness/scripts/desktop_unittest.py
+++ b/testing/mozharness/scripts/desktop_unittest.py
@@ -697,6 +697,7 @@ class DesktopUnittest(TestingMixin, MercurialScript, BlobUploadMixin, MozbaseMix
                     env['MOZ_NODE_PATH'] = self.nodejs_path
                 env['MOZ_UPLOAD_DIR'] = self.query_abs_dirs()['abs_blob_upload_dir']
                 env['MINIDUMP_SAVE_PATH'] = self.query_abs_dirs()['abs_blob_upload_dir']
+                env['RUST_BACKTRACE'] = '1'
                 if not os.path.isdir(env['MOZ_UPLOAD_DIR']):
                     self.mkdir_p(env['MOZ_UPLOAD_DIR'])
 
diff --git a/testing/mozharness/scripts/marionette.py b/testing/mozharness/scripts/marionette.py
index 976213c69e3b..0b0c1cf6e07c 100755
--- a/testing/mozharness/scripts/marionette.py
+++ b/testing/mozharness/scripts/marionette.py
@@ -307,6 +307,7 @@ class MarionetteTest(TestingMixin, MercurialScript, BlobUploadMixin, TransferMix
             env['MINIDUMP_STACKWALK'] = self.minidump_stackwalk_path
         env['MOZ_UPLOAD_DIR'] = self.query_abs_dirs()['abs_blob_upload_dir']
         env['MINIDUMP_SAVE_PATH'] = self.query_abs_dirs()['abs_blob_upload_dir']
+        env['RUST_BACKTRACE'] = '1'
 
         if self.config['allow_software_gl_layers']:
             env['MOZ_LAYERS_ALLOW_SOFTWARE_GL'] = '1'
diff --git a/testing/mozharness/scripts/web_platform_tests.py b/testing/mozharness/scripts/web_platform_tests.py
index a60ed3c0f2c6..6e373e15cf90 100755
--- a/testing/mozharness/scripts/web_platform_tests.py
+++ b/testing/mozharness/scripts/web_platform_tests.py
@@ -240,6 +240,7 @@ class WebPlatformTest(TestingMixin, MercurialScript, BlobUploadMixin, CodeCovera
                                         log_compact=True)
 
         env = {'MINIDUMP_SAVE_PATH': dirs['abs_blob_upload_dir']}
+        env['RUST_BACKTRACE'] = '1'
 
         if self.config['allow_software_gl_layers']:
             env['MOZ_LAYERS_ALLOW_SOFTWARE_GL'] = '1'