Hi. >> Do the functions 'i8xx_irq_handler' and 'queue_work_on' always appear in >> the call trace? > > I can't remember. If I encounter the problem again, > I will check it. After the last reply, I encountered the same problems twice. In the both problems, the functions 'i8xx_irq_handler' and 'queue_work_on' appeared in the call trace. --- Kubo Hiroshi <h-kubo@geisya.or.jp>