From cbe38f771c0cb7d098878e8e703ed23620f868f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 30 Jan 2026 23:58:17 +0100
Subject: [PATCH] std.Io.Threaded: consider EOPNOTSUPP to be programmer error
 in createFileMap()

Not doing so was hiding bugs (e.g. on s390x-linux).
---
 lib/std/Io/Threaded.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index f0562504fd5e4b833ed19ddea38638b0824bd5f1..918b0f43f96ce4e64f9e10311b0e4c93a5de48f3 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -16796,6 +16796,7 @@ fn createFileMap(
                 .OVERFLOW => return error.Unseekable,
                 .BADF => return errnoBug(err), // Always a race condition.
                 .INVAL => return errnoBug(err), // Invalid parameters to mmap()
+                .OPNOTSUPP => return errnoBug(err), // Bad flags with MAP.SHARED_VALIDATE on Linux.
                 else => return posix.unexpectedErrno(err),
             }
         };
-- 
2.54.0