Hi! When system is writing a kernel core dump, it issues watchdog pat wdog_kern_pat(WD_LASTVAL). If ipmi is in action, it registers ipmi_wd_event() as event for watchdog. Thus ipmi_wd_event() is called in dumping context. The problem is that ipmi_wd_event() calls into ipmi_set_watchdog(), that calls into ipmi_alloc_request(), which uses M_WAITOK and thus sleeps. This is a smaller problem, since can be converted to M_NOWAIT. But ipmi_set_watchdog() then calls into ipmi_submit_driver_request(), which calls msleep() any time. The attached patch allows me to successfully write cores in presence of IPMI. -- Totus tuus, Glebius.
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