Bug report

After upgrading from dd-trace-php 1.16.0 to 1.17.0, we see glibc heap corruption in our FrankenPHP/Laravel Octane (long-running ZTS) production environment:

  malloc_consolidate(): unaligned fastbin chunk detected
  memory allocation of 3420891154821048684 bytes failed

The process crashes and requires a restart. Intermittent, affects ~20% of pods under production load.
We confirmed by comparing two Docker images identical in every way except dd-trace-php version:

Environment (identical between both images):

PHP 8.4.19 (ZTS, Zend Memory Manager disabled)
Debian 13 (trixie), x86_64
FrankenPHP/Caddy 2.11.2 (serversideup/php:8.4-frankenphp)
grpc ext 1.78.0
redis ext 6.3.0

Results:

dd-trace-php 1.16.0 - stable under production load
dd-trace-php 1.17.0 - heap corruption under load

Profiling config: allocation profiling enabled, timeline enabled, CPU time profiling enabled.

Pinning back to 1.16.0 resolved the issue immediately.

PHP version

PHP 8.4.19 (ZTS) built Mar 16 2026

Tracer or profiler version

1.17.0

Installed extensions

Installed extensions: Core, ctype, curl, datadog-profiling, date, ddappsec, ddtrace, dom, fileinfo, filter, grpc, hash, iconv, json, libxml, mbstring, mysqlnd, openssl, pcntl, pcre, PDO, pdo_mysql, pdo_pgsql, pdo_sqlite, Phar, posix, random, readline, redis, Reflection, session, SimpleXML, sodium, SPL, sqlite3, standard, tokenizer, xml, xmlreader, xmlwriter, Zend OPcache, zip, zlib

Output of `phpinfo()`

No response

Upgrading from