Date: Tue, 17 May 2011 15:38:33 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Charles Sprickman <spork@bway.net>, stable@FreeBSD.org Subject: Re: 8.1R possible zfs snapshot livelock? Message-ID: <4DD26C49.4010108@FreeBSD.org> In-Reply-To: <20110517122323.GA49650@icarus.home.lan> References: <alpine.OSX.2.00.1105170120510.1983@hotlap.nat.fasttrackmonkey.com> <20110517073029.GA44359@icarus.home.lan> <4DD25264.8040305@FreeBSD.org> <20110517112952.GA48610@icarus.home.lan> <4DD2624A.9080708@FreeBSD.org> <20110517122323.GA49650@icarus.home.lan>
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on 17/05/2011 15:23 Jeremy Chadwick said the following: > So for Charles' situation, the next time it happens what would be useful > for him to provide? The best I could come up with was to induce doadump > then reboot to get the system up/working again, and then use kgdb > after-the-fact. This is one of the best things to do, if possible. In this case all the potentially useful info would be preserved. Less drastic approach to hanged I/O debugging is to find out where processes/threads are actually stuck. E.g. using procstat -kk. -- Andriy Gapon
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