From d84a211b919aa0c92a495412b3673fe43fa95f1e Mon Sep 17 00:00:00 2001
From: SoftFever <softfeverever@gmail.com>
Date: Sun, 26 Jul 2026 22:15:45 +0800
Subject: [PATCH] fix crashes when switching bbl printers

---
 src/slic3r/GUI/wxMediaCtrl2.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/wxMediaCtrl2.cpp b/src/slic3r/GUI/wxMediaCtrl2.cpp
index 2c4b789e12..f2d1d2701e 100644
--- a/src/slic3r/GUI/wxMediaCtrl2.cpp
+++ b/src/slic3r/GUI/wxMediaCtrl2.cpp
@@ -602,6 +602,12 @@ WXLRESULT wxMediaCtrl2::MSWWindowProc(WXUINT   nMsg,
                                    WXWPARAM wParam,
                                    WXLPARAM lParam)
 {
+    // The stream source sends WM_USER+1000 with a synchronous SendMessage from its own threads,
+    // so this runs re-entrantly on the UI thread at whatever message-retrieval point the player
+    // happens to be in - often nested inside an Orca log statement. Never BOOST_LOG_TRIVIAL here:
+    // boost::log is not re-entrant on one thread, and doing so corrupted its per-thread record
+    // state, crashing later in unrelated places (the player, the log filter, a plug-in heap free).
+    // Post the string out (as the stat branch does) and log it on a clean stack instead.
     if (nMsg == WM_USER + 1000) {
         wxString msg((wchar_t const *) lParam);
         if (wParam == 1) {
@@ -619,7 +625,6 @@ WXLRESULT wxMediaCtrl2::MSWWindowProc(WXUINT   nMsg,
                 wxPostEvent(this, evt);
             }
         }
-        BOOST_LOG_TRIVIAL(trace) << msg.ToUTF8().data();
         return 0;
     }
     return wxMediaCtrl::MSWWindowProc(nMsg, wParam, lParam);