proc/internal/ebpf: clarify pointer/slice deref_val limitations

Explain why we display raw addresses instead of dereferenced values:
element type info isn't propagated through the eBPF pipeline, and
deref_val is limited to 48 bytes which is insufficient for nested
or variable-length types.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: derekparker

pkg/proc/internal/ebpf/helpers.go

@@ -230,18 +230,19 @@ func parseFunctionParameterList(rawParamBytes []byte) RawUProbeParams {
 			}
 		case reflect.Ptr, reflect.UnsafePointer:
 			// Display the raw pointer address as a uintptr value.
-			// The eBPF probe captures the dereferenced data into deref_val,
-			// but loadValue runs Go-side after the probe returns and tries
-			// to follow pointer chains through fake memory, which fails.
-			// Displaying the address is the safe fallback.
+			// The eBPF probe captures dereferenced data into deref_val
+			// (up to 0x30 bytes), but we can't use it here because:
+			// 1) loadPtr needs the element type, which isn't propagated
+			//    through the eBPF pipeline (only Kind and Size are sent)
+			// 2) deref_val is limited to 48 bytes, insufficient for
+			//    nested or variable-length pointed-to types
 			iparam.Kind = reflect.Uintptr
 			iparam.RealType = &godwarf.UintType{BasicType: godwarf.BasicType{CommonType: godwarf.CommonType{ByteSize: int64(ret.size), ReflectKind: reflect.Uintptr}}}
 		case reflect.Slice:
 			// Display the slice data pointer address as a uintptr value.
-			// The eBPF probe captures element data into deref_val, but
-			// loadValue runs Go-side after the probe and tries to load
-			// slice elements through fake memory, which fails.
-			// Displaying the data pointer address is the safe fallback.
+			// Same limitations as pointers above: element type info is
+			// not available, and deref_val (48 bytes) can only hold a
+			// few elements.
 			iparam.Kind = reflect.Uintptr
 			iparam.RealType = &godwarf.UintType{BasicType: godwarf.BasicType{CommonType: godwarf.CommonType{ByteSize: 8, ReflectKind: reflect.Uintptr}}}
 		case reflect.String: