Commit 923ddd94a1

mlugg <mlugg@mlugg.co.uk>
2025-10-11 12:10:33
std.posix: panic on unexpected error in `munmap`
This is to help diagnose #25498. We can't use `unexpectedErrno` here, because `std.posix.munmap` is infallible. So, when the flag is set to report unexpected errnos, we just call `std.debug.panic` to provide details instead of doing `unreachable`. Pushing straight to master after running checks locally; there's no point waiting for CI on the PR just for this.
master
1 parent 2e31077
Changed files (1)
lib
std
posix.zig
lib/std/posix.zig
@@ -4991,7 +4991,9 @@ pub fn munmap(memory: []align(page_size_min) const u8) void {
         .SUCCESS => return,
         .INVAL => unreachable, // Invalid parameters.
         .NOMEM => unreachable, // Attempted to unmap a region in the middle of an existing mapping.
-        else => unreachable,
+        else => |e| if (unexpected_error_tracing) {
+            std.debug.panic("unexpected errno: {d} ({t})", .{ @intFromEnum(e), e });
+        } else unreachable,
     }
 }