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Date:      Mon, 28 Nov 2011 15:14:21 -0800
From:      Xin LI <delphij@delphij.net>
To:        freebsd-current@freebsd.org
Subject:   Re: iSCSI initiator: iscontrol cannot be stopped or killed
Message-ID:  <4ED415CD.1080005@delphij.net>
In-Reply-To: <201111240126.21470.Mark.Martinec%2Bfreebsd@ijs.si>
References:  <201111240126.21470.Mark.Martinec%2Bfreebsd@ijs.si>

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On 11/23/11 16:26, Mark Martinec wrote:
> Problem: the iscontrol process starts normally and establishes a
> session and brings up a device, but it cannot be stopped. It does
> not react to a HUP signal, and neither to KILL.
> 
> The /dev/da0 device is operational and the remote disk remains 
> normally accessible, regardless of how I try to (unsuccessfully) 
> shutdown the iscontrol process. The ps reports the state of the 
> process as "Ds", not doing anything. A ktrace does not show any 
> reaction to a received signal. A restart seems to be necessary to
> break the iSCSI session.
> 
> Using FreeBSD 9.0-rc2, amd64, also tried with 9.0-PRERELEASE (csup
> tag=RELENG_9 as of today).  This used to work normally as
> documented on the same host with the same iscsi.conf config file
> before upgrading from 8.2 to 9.0.
> 
> Anybody else experiencing this problem? Suggestions welcome.

Try procstat -kk <pid> to find the calling stack, as a start?  This
could be very useful when tracking down problems.

Also the 'D' flag from ps(1) output in most times are not quite useful
and ps -o wchan would tell you what exactly it was waiting for, just FYI.

Cheers,
- -- 
Xin LI <delphij@delphij.net>	https://www.delphij.net/
FreeBSD - The Power to Serve!		Live free or die
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