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-rw-r--r--erts/emulator/beam/io.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/erts/emulator/beam/io.c b/erts/emulator/beam/io.c
index 31396d06c6..9bf29ee230 100644
--- a/erts/emulator/beam/io.c
+++ b/erts/emulator/beam/io.c
@@ -4884,10 +4884,16 @@ erts_port_control(Process* c_p,
ASSERT(!tmp_alloced);
if (*ebinp == HEADER_SUB_BIN)
ebinp = binary_val(((ErlSubBin *) ebinp)->orig);
+
if (*ebinp != HEADER_PROC_BIN)
copy = 1;
else {
- binp = ((ProcBin *) ebinp)->val;
+ ProcBin *pb = (ProcBin *) ebinp;
+
+ if (pb->flags)
+ erts_emasculate_writable_binary(pb);
+
+ binp = pb->val;
ASSERT(bufp <= bufp + size);
ASSERT(binp->orig_bytes <= bufp
&& bufp + size <= binp->orig_bytes + binp->orig_size);