diff --git a/unix/syscall_freebsd_386.go b/unix/syscall_freebsd_386.go
index b11ede89..6a91d471 100644
--- a/unix/syscall_freebsd_386.go
+++ b/unix/syscall_freebsd_386.go
@@ -60,8 +60,13 @@ func PtraceGetFsBase(pid int, fsbase *int64) (err error) {
 	return ptrace(PT_GETFSBASE, pid, uintptr(unsafe.Pointer(fsbase)), 0)
 }
 
-func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
-	ioDesc := PtraceIoDesc{Op: int32(req), Offs: uintptr(unsafe.Pointer(addr)), Addr: uintptr(unsafe.Pointer(&out[0])), Len: uint32(countin)}
+func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{
+		Op:   int32(req),
+		Offs: offs,
+		Addr: uintptr(unsafe.Pointer(&out[0])), // TODO(#58351): this is not safe.
+		Len:  uint32(countin),
+	}
 	err = ptrace(PT_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
 	return int(ioDesc.Len), err
 }
diff --git a/unix/syscall_freebsd_amd64.go b/unix/syscall_freebsd_amd64.go
index 9ed8eec6..48110a0a 100644
--- a/unix/syscall_freebsd_amd64.go
+++ b/unix/syscall_freebsd_amd64.go
@@ -60,8 +60,13 @@ func PtraceGetFsBase(pid int, fsbase *int64) (err error) {
 	return ptrace(PT_GETFSBASE, pid, uintptr(unsafe.Pointer(fsbase)), 0)
 }
 
-func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
-	ioDesc := PtraceIoDesc{Op: int32(req), Offs: uintptr(unsafe.Pointer(addr)), Addr: uintptr(unsafe.Pointer(&out[0])), Len: uint64(countin)}
+func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{
+		Op:   int32(req),
+		Offs: offs,
+		Addr: uintptr(unsafe.Pointer(&out[0])), // TODO(#58351): this is not safe.
+		Len:  uint64(countin),
+	}
 	err = ptrace(PT_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
 	return int(ioDesc.Len), err
 }
diff --git a/unix/syscall_freebsd_arm.go b/unix/syscall_freebsd_arm.go
index f8ac9824..52f1d4b7 100644
--- a/unix/syscall_freebsd_arm.go
+++ b/unix/syscall_freebsd_arm.go
@@ -56,8 +56,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
 
-func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
-	ioDesc := PtraceIoDesc{Op: int32(req), Offs: uintptr(unsafe.Pointer(addr)), Addr: uintptr(unsafe.Pointer(&out[0])), Len: uint32(countin)}
+func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{
+		Op:   int32(req),
+		Offs: offs,
+		Addr: uintptr(unsafe.Pointer(&out[0])), // TODO(#58351): this is not safe.
+		Len:  uint32(countin),
+	}
 	err = ptrace(PT_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
 	return int(ioDesc.Len), err
 }
diff --git a/unix/syscall_freebsd_arm64.go b/unix/syscall_freebsd_arm64.go
index 8e932036..5537ee4f 100644
--- a/unix/syscall_freebsd_arm64.go
+++ b/unix/syscall_freebsd_arm64.go
@@ -56,8 +56,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
 
-func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
-	ioDesc := PtraceIoDesc{Op: int32(req), Offs: uintptr(unsafe.Pointer(addr)), Addr: uintptr(unsafe.Pointer(&out[0])), Len: uint64(countin)}
+func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{
+		Op:   int32(req),
+		Offs: offs,
+		Addr: uintptr(unsafe.Pointer(&out[0])), // TODO(#58351): this is not safe.
+		Len:  uint64(countin),
+	}
 	err = ptrace(PT_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
 	return int(ioDesc.Len), err
 }
diff --git a/unix/syscall_freebsd_riscv64.go b/unix/syscall_freebsd_riscv64.go
index cbe12227..164abd5d 100644
--- a/unix/syscall_freebsd_riscv64.go
+++ b/unix/syscall_freebsd_riscv64.go
@@ -56,8 +56,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
 
-func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
-	ioDesc := PtraceIoDesc{Op: int32(req), Offs: uintptr(unsafe.Pointer(addr)), Addr: uintptr(unsafe.Pointer(&out[0])), Len: uint64(countin)}
+func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{
+		Op:   int32(req),
+		Offs: offs,
+		Addr: uintptr(unsafe.Pointer(&out[0])), // TODO(#58351): this is not safe.
+		Len:  uint64(countin),
+	}
 	err = ptrace(PT_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
 	return int(ioDesc.Len), err
 }