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Date: Fri, 6 Jul 2018 14:21:44 -0700
From: Omar Sandoval <osandov@osandov.com>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "osandov@fb.com" <osandov@fb.com>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: [PATCH blktests v2 3/3] Add tests for the SRP initiator and
 target drivers
Message-ID: <20180706212144.GF25954@vader>
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On Wed, Jul 04, 2018 at 04:24:42PM +0000, Bart Van Assche wrote:
> On Tue, 2018-07-03 at 14:39 -0700, Omar Sandoval wrote:
> > Alright, I installed multipath-tools from source and the segfaults are
> > gone, but I still don't get these symlinks. Instead, they show up as
> > 
> > /dev/disk/by-id/scsi-3600140572616d6469736b32000000000
> > 
> > Any ideas?
> 
> Hello Omar,
> 
> The dm-uuid symlink is created by a udev rule. Apparently that udev rule is not
> in the same software package as multipathd. Can you run the following command to
> check whether that udev rule is available on your setup?
> 
> grep -r dm-uuid /lib/udev/rules.d/

$ grep -r dm-uuid /lib/udev/rules.d/
/lib/udev/rules.d/13-dm-disk.rules:ENV{DM_UUID}=="?*", SYMLINK+="disk/by-id/dm-uuid-$env{DM_UUID}"


> The name of the package that includes the dm-uuid rule depends on the distro,
> e.g. dmsetup or device-mapper. According to the git history of git repository
> https://sourceware.org/git/?p=lvm2.git the dm-uuid udev rule was added to that
> repository in August 2009, almost nine years ago.

Yup, it's in the device-mapper package for me on Arch Linux (and Arch
has very up-to-date versions of everything). I'll try some udev
debugging.