Fix BPF program loading on 4.x kernels

Signed-off-by: Dom Del Nano <[email protected]>

Author: ddelnano

src/stirling/source_connectors/socket_tracer/bcc_bpf/go_http2_trace.c

@@ -162,6 +162,8 @@ static __inline int32_t get_fd_from_http_http2Framer(const void* framer_ptr,
 
   struct go_interface inner_intf;
   bpf_probe_read(&inner_intf, sizeof(inner_intf), io_writer_interface.ptr + inner_intf_offset);
+  BPF_PROBE_READ_VAR(inner_intf,
+                     io_writer_interface.ptr + inner_intf_offset);
 
   if (conn_intf) {
     return get_fd_from_conn_intf(inner_intf);