Date: Wed, 14 May 2008 13:48:49 +0200 From: Ben Stuyts <ben@altus-escon.com> To: Kris Kennaway <kris@freebsd.org> Cc: stable@freebsd.org, d@delphij.net Subject: Re: Panic after hung rsync, probably zfs related Message-ID: <6E930383-27FE-470A-96D8-3E61DD21B2BC@altus-escon.com> In-Reply-To: <482A9F99.4040500@FreeBSD.org> References: <7A0780B6-AD8E-440B-BFDB-EC2C4ACA1A70@altus-escon.com> <4829F1B8.1000707@delphij.net> <482A9F99.4040500@FreeBSD.org>
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On 14 mei 2008, at 10:15, Kris Kennaway wrote: >> | While doing an rsync from a zfs filesystem to an external usb hd >> (also >> | zfs), the rsync processes hung in zfs state. I could not kill these >> | processes, although the rest of the server seemingly continued to >> run >> | fine. The reboot command did not work. Next I tried a shutdown now >> | command. This caused a panic: >> Sound like you somehow run out of memory, there is an known issue >> with >> ZFS which causes livelock when there is memory pressure. Which rsync >> version are you using? With rsync 3.x the memory usage would drop >> drastically which would help to prevent this from happening. > > This isn't known to cause a double fault though. Unfortunately we > probably need more information than was available in order to proceed. Yes, I agree. But I don't know what to do in this sort of case where the machine is completely wedged. Ben
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