this optimisation of CLONE_SETTLS is not valid used like this, and future musl
clone(3) will EINVAL on this use
--
--- a/sandbox/linux/services/credentials.cc
+++ b/sandbox/linux/services/credentials.cc
@@ -89,7 +89,7 @@
 
   int clone_flags = CLONE_FS | LINUX_SIGCHLD;
   void* tls = nullptr;
-#if (defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM_FAMILY)) && \
+#if 0 && (defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM_FAMILY)) && \
     !defined(MEMORY_SANITIZER)
   // Use CLONE_VM | CLONE_VFORK as an optimization to avoid copying page tables.
   // Since clone writes to the new child's TLS before returning, we must set a