unix: improve solaris event port panic message

For golang/go#54254

Change-Id: Id59bacfabc5c818478f6a9af8d585f56f74c2bde
Reviewed-on: https://go-review.googlesource.com/c/sys/+/422099
Reviewed-by: Nahum Shalman <nahamu@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
diff --git a/unix/syscall_solaris.go b/unix/syscall_solaris.go
index b5ec457..03fa546 100644
--- a/unix/syscall_solaris.go
+++ b/unix/syscall_solaris.go
@@ -956,7 +956,7 @@
 			// the unsafe version would be (*fileObj)(unsafe.Pointer(uintptr(peInt.Object)))
 			peExt.fobj = fCookie.fobj
 		} else {
-			panic("mismanaged memory")
+			panic("unexpected event port address; may be due to kernel bug; see https://go.dev/issue/54254")
 		}
 		delete(e.cookies, cookie)
 		peExt.Path = BytePtrToString((*byte)(unsafe.Pointer(peExt.fobj.Name)))