diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 27d44d477b7..789fe2251bd 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -438,7 +438,13 @@ void SkDevice::drawGlyphRunList(SkCanvas* canvas,
 void SkDevice::simplifyGlyphRunRSXFormAndRedraw(SkCanvas* canvas,
                                                 const sktext::GlyphRunList& glyphRunList,
                                                 const SkPaint& paint) {
-    for (const sktext::GlyphRun& run : glyphRunList) {
+    // glyphRunList typically spans into the canvas's scratch GlyphRunBuilder
+    // storage. drawGlyphRunList() below can reenter SkCanvas::drawTextBlob()
+    // (e.g. via a glyph SkDrawable that draws a text blob), which reuses and
+    // reallocates that storage and would invalidate our iterator. Take a
+    // local copy of the runs before drawing any of them.
+    std::vector<sktext::GlyphRun> localRuns(glyphRunList.begin(), glyphRunList.end());
+    for (const sktext::GlyphRun& run : localRuns) {
         if (run.scaledRotations().empty()) {
             auto subList = glyphRunList.builder()->makeGlyphRunList(run, paint, {0, 0});
             this->drawGlyphRunList(canvas, subList, paint);