diff --git a/.circleci/continue_config.yml b/.circleci/continue_config.yml
index c69f3ce482..5896a89e79 100644
--- a/.circleci/continue_config.yml
+++ b/.circleci/continue_config.yml
@@ -911,6 +911,7 @@ jobs:
             if [[ "<<parameters.xdebug_version_one>>" == "3.4.0" ]]; then
               ln -s $(php-config --extension-dir)/xdebug-3.4.0.so $(php-config --extension-dir)/xdebug-3.4.0alpha2-dev.so
             fi
+            sed -i 's/\bdl(/(bool)(/' /usr/local/src/php/run-tests.php
             php /usr/local/src/php/run-tests.php -g FAIL,XFAIL,BORK,WARN,LEAK,XLEAK,SKIP -p $(which php) --show-all -d zend_extension=xdebug-<< parameters.xdebug_version_one >>.so tests/xdebug/$(targetdir << parameters.xdebug_version_one >>)
             if [[ ! "<<parameters.xdebug_version_two>>" == "none" ]]; then
               php /usr/local/src/php/run-tests.php -g FAIL,XFAIL,BORK,WARN,LEAK,XLEAK,SKIP -p $(which php) --show-all -d zend_extension=xdebug-<< parameters.xdebug_version_two >>.so tests/xdebug/$(targetdir << parameters.xdebug_version_two >>)
@@ -978,7 +979,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core*" -type f | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core*" -type f | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/$(if [[ << parameters.make_target >> == *opcache* ]]; then echo opcache; else echo ext; fi) /tmp/artifacts/tests
           when: on_fail
@@ -1028,7 +1029,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core*" -type f | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core*" -type f | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
             find /tmp/artifacts/tests -name '*.phpt' -delete
@@ -1080,7 +1081,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
             find /tmp/artifacts/tests -name '*.phpt' -delete
@@ -1179,7 +1180,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
             find /tmp/artifacts/tests -name '*.phpt' -delete
           when: on_fail
@@ -1303,7 +1304,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
           when: on_fail
@@ -1766,7 +1767,7 @@ jobs:
             mkdir -p /tmp/artifacts
             find ~/datadog/tests -type f \( -name 'phpunit_error.log' -o -name 'nginx_*.log' -o -name 'apache_*.log' -o -name 'php_fpm_*.log' -o -name 'dd_php_error.log' -o -name 'sidecar.log' \) -exec cp --parents '{}' /tmp/artifacts \;
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
           when: on_fail
       - run:
@@ -1977,7 +1978,7 @@ jobs:
           command: |
             cd /usr/local/src/php
             mkdir -p /tmp/artifacts/core_dumps
-            find ./ -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find ./ -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             mkdir -p /tmp/artifacts/diffs
             find -type f -name '*.diff' -exec cp --parents '{}' /tmp/artifacts/diffs \;
           when: on_fail
@@ -2060,7 +2061,7 @@ jobs:
             mkdir -p /tmp/artifacts
             find ~/datadog/tests -type f \( -name 'phpunit_error.log' -o -name 'nginx_*.log' -o -name 'apache_*.log' -o -name 'php_fpm_*.log' -o -name 'dd_php_error.log' \) -exec cp --parents '{}' /tmp/artifacts \;
             mkdir -p /tmp/artifacts/core_dumps
-            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find /tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
           when: on_fail
       - store_artifacts:
@@ -2135,7 +2136,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
             find /tmp/artifacts/tests -name '*.phpt' -delete
@@ -2189,7 +2190,7 @@ jobs:
       - run:
           command: |
             mkdir -p /tmp/artifacts/core_dumps
-            find tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps
+            find tmp -name "core.*" | xargs -I % -n 1 cp % /tmp/artifacts/core_dumps && chmod -R o+rx /tmp/artifacts/core_dumps
             ! [ "$(ls -A /tmp/artifacts/core_dumps)" ] || cp tmp/build_extension/modules/ddtrace.so /tmp/artifacts/
             cp -a tmp/build_extension/tests/ext /tmp/artifacts/tests
             find /tmp/artifacts/tests -name '*.phpt' -delete
@@ -5004,7 +5005,6 @@ workflows:
                 - PHP_MAJOR=8 PHP_MINOR=1
                 - PHP_MAJOR=8 PHP_MINOR=2
                 - PHP_MAJOR=8 PHP_MINOR=3
-                - PHP_MAJOR=8 PHP_MINOR=4
       - verify_debian:
           requires: [ "package extension" ]
           matrix:
diff --git a/Cargo.lock b/Cargo.lock
index 20329ba566..cbefa5aad6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1314,6 +1314,7 @@ dependencies = [
  "anyhow",
  "backtrace",
  "blazesym",
+ "cc",
  "chrono",
  "ddcommon 0.0.1",
  "ddtelemetry",
@@ -1321,6 +1322,8 @@ dependencies = [
  "hyper 0.14.32",
  "libc 0.2.169",
  "nix 0.27.1",
+ "num-derive",
+ "num-traits",
  "os_info",
  "page_size",
  "portable-atomic",
@@ -3460,6 +3463,17 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
 
+[[package]]
+name = "num-derive"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.96",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.46"
diff --git a/Makefile b/Makefile
index 2886fc6b82..d98f01e4dc 100644
--- a/Makefile
+++ b/Makefile
@@ -109,6 +109,7 @@ $(BUILD_DIR)/configure: $(M4_FILES) $(BUILD_DIR)/ddtrace.sym $(BUILD_DIR)/VERSIO
 
 $(BUILD_DIR)/run-tests.php: $(if $(ASSUME_COMPILED),, $(BUILD_DIR)/configure)
 	$(if $(ASSUME_COMPILED), cp $(shell dirname $(shell realpath $(shell which phpize)))/../lib/php/build/run-tests.php $(BUILD_DIR)/run-tests.php)
+	sed -i 's/\bdl(/(bool)(/' $(BUILD_DIR)/run-tests.php # this dl() stuff in run-tests.php is for --EXTENSIONS-- sections, which we don't use; just strip it away (see https://github.com/php/php-src/issues/15367)
 
 $(BUILD_DIR)/Makefile: $(BUILD_DIR)/configure
 	$(Q) (cd $(BUILD_DIR); ./configure --$(if $(RUST_DEBUG_BUILD),enable,disable)-ddtrace-rust-debug $(if $(ASAN), --enable-ddtrace-sanitize) $(EXTRA_CONFIGURE_OPTIONS))
diff --git a/components-rs/common.h b/components-rs/common.h
index 2614f4c304..502ebd96ae 100644
--- a/components-rs/common.h
+++ b/components-rs/common.h
@@ -915,6 +915,7 @@ typedef enum ddog_crasht_OpTypes {
 
 /**
  * See https://man7.org/linux/man-pages/man2/sigaction.2.html
+ * MUST REMAIN IN SYNC WITH THE ENUM IN emit_sigcodes.c
  */
 typedef enum ddog_crasht_SiCodes {
   DDOG_CRASHT_SI_CODES_BUS_ADRALN,
@@ -922,6 +923,14 @@ typedef enum ddog_crasht_SiCodes {
   DDOG_CRASHT_SI_CODES_BUS_MCEERR_AO,
   DDOG_CRASHT_SI_CODES_BUS_MCEERR_AR,
   DDOG_CRASHT_SI_CODES_BUS_OBJERR,
+  DDOG_CRASHT_SI_CODES_ILL_BADSTK,
+  DDOG_CRASHT_SI_CODES_ILL_COPROC,
+  DDOG_CRASHT_SI_CODES_ILL_ILLADR,
+  DDOG_CRASHT_SI_CODES_ILL_ILLOPC,
+  DDOG_CRASHT_SI_CODES_ILL_ILLOPN,
+  DDOG_CRASHT_SI_CODES_ILL_ILLTRP,
+  DDOG_CRASHT_SI_CODES_ILL_PRVOPC,
+  DDOG_CRASHT_SI_CODES_ILL_PRVREG,
   DDOG_CRASHT_SI_CODES_SEGV_ACCERR,
   DDOG_CRASHT_SI_CODES_SEGV_BNDERR,
   DDOG_CRASHT_SI_CODES_SEGV_MAPERR,
diff --git a/libdatadog b/libdatadog
index 7a481f89ed..5bd8ebc926 160000
--- a/libdatadog
+++ b/libdatadog
@@ -1 +1 @@
-Subproject commit 7a481f89ed9a2d0ba473f4e946a3e68d6c8d3a97
+Subproject commit 5bd8ebc926146aa223f0f83fbef3508bac2de09f
diff --git a/loader/bin/test.sh b/loader/bin/test.sh
index b3013ca897..0f529ad89b 100755
--- a/loader/bin/test.sh
+++ b/loader/bin/test.sh
@@ -29,7 +29,8 @@ printf "Test load loader\n\n"
 DD_TRACE_DEBUG=1 php -n -d zend_extension=${PWD}/modules/dd_library_loader.so -v
 
 printf "\nRunning PHPT tests\n"
-php -n run-tests.php -q -p $(which php) -n -d zend_extension=${PWD}/modules/dd_library_loader.so --show-diff
+# point extension_dir into nirvana to avoid issues with dl()
+php -n run-tests.php -q -p $(which php) -n -d extension_dir=/dev/shm/ -d zend_extension=${PWD}/modules/dd_library_loader.so --show-diff
 
 printf "\nRunning functional tests\n\n"
 failure=0
diff --git a/tests/ext/background-sender/agent_headers_container_id.phpt b/tests/ext/background-sender/agent_headers_container_id.phpt
index cb8b6e732f..c00e04ab7b 100644
--- a/tests/ext/background-sender/agent_headers_container_id.phpt
+++ b/tests/ext/background-sender/agent_headers_container_id.phpt
@@ -40,7 +40,7 @@ echo 'Done.' . PHP_EOL;
 --EXPECTF--
 [ddtrace] [info] Flushing trace of size 1 to send-queue for http://request-replayer:80
 
-datadog-container-id: 9d5b23edb1ba181e8910389a99906598d69ac9a0ead109ee55730cc416d95f7f
+datadog-container-id:%s9d5b23edb1ba181e8910389a99906598d69ac9a0ead109ee55730cc416d95f7f
 datadog-meta-lang: php
 
 Done.
diff --git a/tests/ext/background-sender/agent_headers_container_id_empty.phpt b/tests/ext/background-sender/agent_headers_container_id_empty.phpt
index afbd716b0a..52b7686d91 100644
--- a/tests/ext/background-sender/agent_headers_container_id_empty.phpt
+++ b/tests/ext/background-sender/agent_headers_container_id_empty.phpt
@@ -11,6 +11,7 @@ DD_TRACE_AGENT_FLUSH_AFTER_N_REQUESTS=1
 DD_TRACE_AGENT_FLUSH_INTERVAL=333
 DD_TRACE_GENERATE_ROOT_SPAN=0
 DD_INSTRUMENTATION_TELEMETRY_ENABLED=0
+DD_TRACE_SIDECAR_TRACE_SENDER=0
 --INI--
 ddtrace.cgroup_file={PWD}/stubs/cgroup.empty
 datadog.trace.agent_test_session_token=background-sender/agent_headers_container_id_empty
diff --git a/tests/ext/background-sender/agent_headers_container_id_fargate.phpt b/tests/ext/background-sender/agent_headers_container_id_fargate.phpt
index 796629e986..23551339f7 100644
--- a/tests/ext/background-sender/agent_headers_container_id_fargate.phpt
+++ b/tests/ext/background-sender/agent_headers_container_id_fargate.phpt
@@ -39,7 +39,7 @@ echo 'Done.' . PHP_EOL;
 --EXPECTF--
 [ddtrace] [info] Flushing trace of size 1 to send-queue for http://request-replayer:80
 
-datadog-container-id: 34dc0b5e626f2c5c4c5170e34b10e765-1234567890
+datadog-container-id:%s34dc0b5e626f2c5c4c5170e34b10e765-1234567890
 datadog-meta-lang: php
 
 Done.