Index: server/Slim/Utils/MySQLHelper.pm
===================================================================
--- server/Slim/Utils/MySQLHelper.pm	(revision 24386)
+++ server/Slim/Utils/MySQLHelper.pm	(working copy)
@@ -248,6 +248,15 @@
 	my $confFile = $class->confFile;
 	my $process  = undef;
 
+	# Bug: 8461
+	if ( defined($ENV{'TMPDIR'}) && ($ENV{'TMPDIR'} ne '') ) {
+		# make sure TMPDIR points to a dir we can use so MySQL will start
+		if ( (! -d $ENV{'TMPDIR'}) || (! -w $ENV{'TMPDIR'}) ) {
+			$log->error("TMPDIR environment variable points to a location that is not a usable location (\"$ENV{'TMPDIR'}\"), unsetting TMPDIR so MySQL can run");
+			$ENV{'TMPDIR'} = undef;
+		}
+	}
+
 	# Bug: 3461
 	$mysqld   = Slim::Utils::OSDetect::getOS->decodeExternalHelperPath($mysqld);
 	$confFile = Slim::Utils::OSDetect::getOS->decodeExternalHelperPath($confFile);