From 1cacd35facce60987ceb156d437d75cc22a57d51 Mon Sep 17 00:00:00 2001
From: Drew Scoggins <anscoggi@microsoft.com>
Date: Wed, 1 Jul 2026 08:36:35 -0700
Subject: [PATCH] [wasm] Pin linux/win V8 to 15.1.103 for exnref support

PR #129851 switched WASM exception handling to the standardized exnref
proposal, which requires V8 with --experimental-wasm-exnref (V8 15.1+).
The subsequent chrome-for-testing bump (#129934) recomputed the V8 version
from Chrome 149 and reverted linux_V8Version/win_V8Version from 15.1.103 back
to 14.9.207, which does not understand exnref. As a result the wasm perf leg
(which installs V8 via jsvu using linux_V8Version) and other V8 shell legs
abort at startup:

    Warning: unknown flag --experimental-wasm-exnref.
    MONO_WASM: Assert failed: This browser/engine doesn't support WASM
    exception handling.

Restore linux/win V8 to 15.1.103 (matching macos_V8Version), which is
available on the V8 canary CDN that jsvu downloads from and supports exnref
behind the flag already passed by WasmRunnerTemplate.sh and the perf harness.

See #129849.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 eng/testing/BrowserVersions.props | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/eng/testing/BrowserVersions.props b/eng/testing/BrowserVersions.props
index ab988a5941172c..78447910c0befe 100644
--- a/eng/testing/BrowserVersions.props
+++ b/eng/testing/BrowserVersions.props
@@ -3,7 +3,7 @@
     <linux_ChromeVersion>149.0.7827.200</linux_ChromeVersion>
     <linux_ChromeRevision>1625079</linux_ChromeRevision>
     <linux_ChromeBaseSnapshotUrl>https://storage.googleapis.com/chromium-browser-snapshots/Linux_x64/1625084</linux_ChromeBaseSnapshotUrl>
-    <linux_V8Version>14.9.207</linux_V8Version>
+    <linux_V8Version>15.1.103</linux_V8Version>
     <macos_ChromeVersion>143.0.7499.40</macos_ChromeVersion>
     <macos_ChromeRevision>1536371</macos_ChromeRevision>
     <macos_ChromeBaseSnapshotUrl>https://storage.googleapis.com/chromium-browser-snapshots/Mac_Arm/1536376</macos_ChromeBaseSnapshotUrl>
@@ -11,7 +11,7 @@
     <win_ChromeVersion>149.0.7827.201</win_ChromeVersion>
     <win_ChromeRevision>1625079</win_ChromeRevision>
     <win_ChromeBaseSnapshotUrl>https://storage.googleapis.com/chromium-browser-snapshots/Win_x64/1625123</win_ChromeBaseSnapshotUrl>
-    <win_V8Version>14.9.207</win_V8Version>
+    <win_V8Version>15.1.103</win_V8Version>
     <linux_FirefoxRevision>140.11.0esr</linux_FirefoxRevision>
     <linux_GeckoDriverRevision>0.37.0</linux_GeckoDriverRevision>
     <win_FirefoxRevision>140.11.0esr</win_FirefoxRevision>