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diff --git a/security/sandbox/linux/SandboxFilter.cpp b/security/sandbox/linux/SandboxFilter.cpp
--- a/security/sandbox/linux/SandboxFilter.cpp
+++ b/security/sandbox/linux/SandboxFilter.cpp
@@ -711,6 +711,13 @@
return Error(EPERM);
#endif
+ // Bug 1651701: an API for restartable atomic sequences and
+ // per-CPU data; exposing information about CPU numbers and
+ // when threads are migrated or preempted isn't great but the
+ // risk should be relatively low.
+ case __NR_rseq:
+ return Allow();
+
#ifdef MOZ_ASAN
// ASAN's error reporter wants to know if stderr is a tty.
case __NR_ioctl: {
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