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musl ldso issues a membarrier when setting up TLS
--- firefox-68.7.0/security/sandbox/linux/SandboxFilter.cpp 2020-04-03 19:30:03.000000000 +0000
+++ firefox-68.7.0/security/sandbox/linux/SandboxFilter.cpp 2020-04-19 04:59:30.280000000 +0000
@@ -529,6 +529,7 @@ class SandboxPolicyCommon : public Sandb
// ipc::Shmem; also, glibc when creating threads:
case __NR_mprotect:
+ case __NR_membarrier:
return Allow();
// madvise hints used by malloc; see bug 1303813 and bug 1364533
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