WVCdm: no destroy global log buffer on exit

[ Merge of go/wvgerrit/149989 ]

Bug: 227848537
Change-Id: I9407b133654c20ddcd3c15404dd19b3719064e6e
Test: Irdeto monkey test

libwvdrmengine/cdm/util/src/log.cpp

@@ -57,7 +57,11 @@ int64_t GetCurrentTimeMs() {
 
 LogPriority g_cutoff = CDM_LOG_VERBOSE;
 
-LogBuffer g_logbuf;
+// This LogBuffer instance shares its mutex with multiple
+// threads which might not release the mutex if suddenly closed
+// by a signal.  Destroying an in-use mutex may cause a process
+// crash.  Leave memory clean to the kernel when the process exits.
+[[clang::no_destroy]] LogBuffer g_logbuf;
 
 thread_local bool tl_logging_uid_set_ = false;