Hi, http://dev.haiku-os.org/ticket/1727 I can reproduce this bug with one via chip 1394 card. I checked again and again the firewire code, but couldn't find which cause the instability. Someone mentioned there's no such problem with gcc2 build. IIRC, gcc4 build last year is also ok. Any idea about this bug. This bug reminds me haiku's rtl8139 driver's instability, IMHO, there are common issues between them. Regards, JiSheng