Index: source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
===================================================================
--- source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
+++ source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
@@ -816,6 +816,9 @@
             dreg_state.dbg_regs[i].addr = m_hwp_regs[i].address;
             dreg_state.dbg_regs[i].ctrl = m_hwp_regs[i].control;
         }
+
+        ioVec.iov_len = (offsetof (struct user_hwdebug_state, dbg_regs[m_max_hwp_supported - 1])
+                        + sizeof (dreg_state.dbg_regs [m_max_hwp_supported - 1]));
     }
     else
     {
@@ -826,6 +829,8 @@
             dreg_state.dbg_regs[i].addr = m_hbr_regs[i].address;
             dreg_state.dbg_regs[i].ctrl = m_hbr_regs[i].control;
         }
+        ioVec.iov_len = (offsetof (struct user_hwdebug_state, dbg_regs[m_max_hbp_supported - 1])
+                        + sizeof (dreg_state.dbg_regs [m_max_hbp_supported - 1]));
     }
 
     return NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, m_thread.GetID(), &hwbType, &ioVec, ioVec.iov_len);