Date: Tue, 27 Feb 2007 08:44:06 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Jiawei Ye <leafy7382@gmail.com> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: Processes stuck in *unp_m after recent uipc changes Message-ID: <20070227084214.Y56223@fledge.watson.org> In-Reply-To: <c21e92e20702270007u277d6a9xfaca7883da9dedd@mail.gmail.com> References: <c21e92e20702270007u277d6a9xfaca7883da9dedd@mail.gmail.com>
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On Tue, 27 Feb 2007, Jiawei Ye wrote: > With the latest uipc locking changes, I experienced a hard lockup on my > -current machine. Many processes got stuck in *unp_m state and > ctrl-alt-delete at the console cannot properly restart the machine and I had > to hard-reset (no coredump available). Is there anyway to diagnose this? Please configure WITNESS, DDB, and BREAK_TO_DEBUGGER on a box with a serial console. Then attach the output of "ps", "show alllocks", and "alltrace" to an e-mail. With any luck, this is a leaked lock in some missed error case and we can just add a missing unlock. Thanks! Robert N M Watson Computer Laboratory University of Cambridge
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