Re: [PATCH blktests v2 3/3] Add tests for the SRP initiator and target drivers

Omar Sandoval
2018-07-06T23:03:30Z

On Fri, Jul 06, 2018 at 02:21:44PM -0700, Omar Sandoval wrote:
> 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.

Alright, I'm not getting the udev events at all (even after enabling
CONFIG_DM_UEVENT in addition to everything mentioned in the README). I
have no idea where to go from here.

After, e.g., srp/002 fails, this is the state of my system:

$ sudo multipath -l
$ ls /sys/class/block
nvme0n1 ram0 ram1 ram2 sda sdb sdc sdd vda vda1 vdb vdc vdd
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 32M 0 disk
sdb 8:16 0 32M 0 disk
sdc 8:32 0 32M 0 disk
sdd 8:48 0 32M 0 disk
vda 254:0 0 16G 0 disk
└─vda1 254:1 0 16G 0 part /
vdb 254:16 0 8G 0 disk
vdc 254:32 0 8G 0 disk
vdd 254:48 0 8G 0 disk
nvme0n1 259:0 0 8G 0 disk
$ lsscsi
[0:0:0:0] disk Linux scsi_debug 0188 /dev/sda
[1:0:0:0] disk LIO-ORG IBLOCK 4.0 /dev/sdb
[1:0:0:1] disk LIO-ORG IBLOCK 4.0 /dev/sdd
[1:0:0:2] disk LIO-ORG IBLOCK 4.0 /dev/sdc