diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 6b2bab84..9fe16847 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -3379,6 +3379,10 @@ sub vm_deviceunplug {
 
     } elsif ($deviceid =~ m/^(scsi)(\d+)$/) {
 
+	#qemu 2.3 segfault on drive_del with virtioscsi + iothread
+	my $device = parse_drive($deviceid, $conf->{$deviceid});
+	die "virtioscsi with iothread is not hot-unplugglable currently" if $device->{iothread};
+
         qemu_devicedel($vmid, $deviceid);
         qemu_drivedel($vmid, $deviceid);
 	qemu_deletescsihw($conf, $vmid, $deviceid);