Re: Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter

To: 872999@bugs.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>, pkg-systemd-maintainers@lists.alioth.debian.org, debian-kernel@lists.debian.org
Subject: Re: Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter
From: Raphael Hertzog <hertzog@debian.org>
Date: Thu, 7 Sep 2017 12:53:08 +0200
Message-id: <[🔎] 20170907105308.663bkmeate73qngq@home.ouaza.com>
Mail-followup-to: Raphael Hertzog <hertzog@debian.org>, 872999@bugs.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>, pkg-systemd-maintainers@lists.alioth.debian.org, debian-kernel@lists.debian.org
In-reply-to: <[🔎] 20170907101647.3a7mfggzpchben3l@home.ouaza.com>
References: <150349587661.18171.15144837513912101786.reportbug@x260-buxy.home.ouaza.com> <[🔎] 20170907101647.3a7mfggzpchben3l@home.ouaza.com>

On Thu, 07 Sep 2017, Raphael Hertzog wrote:
> What informs udev about the new filesystem?

Somehow, it's the kernel apparently.

> Or is this a bug in the kernel really?

At least "udevadm monitor" shows that the kernel is sending
less uevents when I run the command in the chroot. I attach
two logs of "udevadm monitor -k -u -p", once for the run in
the host, and one for the run in schroot.

And I also attach a diff of edited logs where I dropped the
timestamps. We can clearly see the lack of a "KERNEL[] change
/devices/virtual/block/dm-4 (block)" with its associated
UDEV rule adding the by-uuid links.

So this is with 4.12.6-1 (unstable).

Cheers,
-- 
Raphaël Hertzog ◈ Debian Developer

Support Debian LTS: https://www.freexian.com/services/debian-lts.html
Learn to master Debian: https://debian-handbook.info/get/

KERNEL[1303173.467860] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4256
SUBSYSTEM=block

KERNEL[1303173.492386] add      /devices/virtual/bdi/254:4 (bdi)
ACTION=add
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4257
SUBSYSTEM=bdi

KERNEL[1303173.492809] add      /devices/virtual/block/dm-4 (block)
ACTION=add
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
MAJOR=254
MINOR=4
SEQNUM=4258
SUBSYSTEM=block

UDEV  [1303173.493320] add      /devices/virtual/bdi/254:4 (bdi)
ACTION=add
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4257
SUBSYSTEM=bdi
USEC_INITIALIZED=1303173493269

UDEV  [1303173.495279] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
ID_PART_TABLE_TYPE=dos
ID_PART_TABLE_UUID=91b643c6
MAJOR=7
MINOR=0
SEQNUM=4256
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=13952290172

KERNEL[1303173.495444] change   /devices/virtual/block/dm-4 (block)
ACTION=change
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_COOKIE=4194304
MAJOR=254
MINOR=4
SEQNUM=4259
SUBSYSTEM=block

UDEV  [1303173.510693] add      /devices/virtual/block/dm-4 (block)
ACTION=add
DEVLINKS=/dev/disk/by-id/raid-loop0p1
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_DISABLE_DISK_RULES_FLAG=1
DM_UDEV_DISABLE_OTHER_RULES_FLAG=1
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG=1
DM_UUID=part1-loop0
MAJOR=254
MINOR=4
SEQNUM=4258
SUBSYSTEM=block
SYSTEMD_READY=0
TAGS=:systemd:
USEC_INITIALIZED=1303173510442

UDEV  [1303173.527433] change   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVLINKS=/dev/disk/by-partuuid/91b643c6-01 /dev/mapper/loop0p1 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_ACTIVATION=1
DM_COOKIE=4194304
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_SUSPENDED=0
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_PRIMARY_SOURCE_FLAG=1
DM_UDEV_RULES=1
DM_UUID=part1-loop0
ID_FS_TYPE=
ID_PART_ENTRY_DISK=7:0
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_SIZE=19527680
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_UUID=91b643c6-01
MAJOR=254
MINOR=4
SEQNUM=4259
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1303173510442

--- debootstrap ---

KERNEL[1303301.063685] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4260
SUBSYSTEM=block

UDEV  [1303301.069592] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
ID_PART_TABLE_TYPE=dos
ID_PART_TABLE_UUID=91b643c6
MAJOR=7
MINOR=0
SEQNUM=4260
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=13952290172

KERNEL[1303303.480902] remove   /devices/virtual/block/dm-4 (block)
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_COOKIE=6291456
MAJOR=254
MINOR=4
SEQNUM=4261
SUBSYSTEM=block

UDEV  [1303303.497202] remove   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=
ACTION=remove
DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-partuuid/91b643c6-01 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_ACTIVATION=1
DM_COOKIE=6291456
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_SUSPENDED=0
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_DISABLE_LIBRARY_FALLBACK_FLAG=1
DM_UDEV_PRIMARY_SOURCE_FLAG=1
DM_UDEV_RULES=1
DM_UUID=part1-loop0
ID_FS_TYPE=
ID_PART_ENTRY_DISK=7:0
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_SIZE=19527680
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_UUID=91b643c6-01
MAJOR=254
MINOR=4
SEQNUM=4261
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1303173510442

KERNEL[1303303.504839] remove   /devices/virtual/bdi/254:4 (bdi)
ACTION=remove
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4262
SUBSYSTEM=bdi

KERNEL[1303303.505154] remove   /devices/virtual/block/dm-4 (block)
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
MAJOR=254
MINOR=4
SEQNUM=4263
SUBSYSTEM=block

UDEV  [1303303.508068] remove   /devices/virtual/bdi/254:4 (bdi)
ACTION=remove
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4262
SUBSYSTEM=bdi
USEC_INITIALIZED=1303303505069

UDEV  [1303303.509527] remove   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
ID_FS_TYPE=
MAJOR=254
MINOR=4
SEQNUM=4263
SUBSYSTEM=block
USEC_INITIALIZED=1303303506161

KERNEL[1303303.540234] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4264
SUBSYSTEM=block

UDEV  [1303303.541605] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
MAJOR=7
MINOR=0
SEQNUM=4264
SUBSYSTEM=block
SYSTEMD_READY=0
TAGS=:systemd:
USEC_INITIALIZED=13952290172

KERNEL[1302954.323520] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4246
SUBSYSTEM=block

KERNEL[1302954.343939] add      /devices/virtual/bdi/254:4 (bdi)
ACTION=add
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4247
SUBSYSTEM=bdi

KERNEL[1302954.344186] add      /devices/virtual/block/dm-4 (block)
ACTION=add
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
MAJOR=254
MINOR=4
SEQNUM=4248
SUBSYSTEM=block

UDEV  [1302954.344952] add      /devices/virtual/bdi/254:4 (bdi)
ACTION=add
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4247
SUBSYSTEM=bdi
USEC_INITIALIZED=1302954344761

KERNEL[1302954.347235] change   /devices/virtual/block/dm-4 (block)
ACTION=change
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_COOKIE=4235776
MAJOR=254
MINOR=4
SEQNUM=4249
SUBSYSTEM=block

UDEV  [1302954.349050] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
ID_PART_TABLE_TYPE=dos
ID_PART_TABLE_UUID=0bd88d64
MAJOR=7
MINOR=0
SEQNUM=4246
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=13952290172

UDEV  [1302954.371529] add      /devices/virtual/block/dm-4 (block)
ACTION=add
DEVLINKS=/dev/disk/by-id/raid-loop0p1
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_DISABLE_DISK_RULES_FLAG=1
DM_UDEV_DISABLE_OTHER_RULES_FLAG=1
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG=1
DM_UUID=part1-loop0
MAJOR=254
MINOR=4
SEQNUM=4248
SUBSYSTEM=block
SYSTEMD_READY=0
TAGS=:systemd:
USEC_INITIALIZED=1302954371373

UDEV  [1302954.387688] change   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVLINKS=/dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1 /dev/mapper/loop0p1 /dev/disk/by-partuuid/0bd88d64-01
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_ACTIVATION=1
DM_COOKIE=4235776
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_SUSPENDED=0
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_PRIMARY_SOURCE_FLAG=1
DM_UDEV_RULES=1
DM_UUID=part1-loop0
ID_FS_TYPE=
ID_PART_ENTRY_DISK=7:0
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_SIZE=19527680
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_UUID=0bd88d64-01
MAJOR=254
MINOR=4
SEQNUM=4249
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1302954371373

KERNEL[1302954.743984] change   /devices/virtual/block/dm-4 (block)
ACTION=change
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
MAJOR=254
MINOR=4
SEQNUM=4250
SUBSYSTEM=block

UDEV  [1302954.789691] change   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=ext4
ACTION=change
DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-uuid/5fa02639-e3a9-4efa-b36b-45137163844b /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-name-loop0p1 /dev/disk/by-partuuid/0bd88d64-01
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_SUSPENDED=0
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_PRIMARY_SOURCE_FLAG=1
DM_UDEV_RULES=1
DM_UUID=part1-loop0
ID_FS_TYPE=ext4
ID_FS_USAGE=filesystem
ID_FS_UUID=5fa02639-e3a9-4efa-b36b-45137163844b
ID_FS_UUID_ENC=5fa02639-e3a9-4efa-b36b-45137163844b
ID_FS_VERSION=1.0
ID_PART_ENTRY_DISK=7:0
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_SIZE=19527680
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_UUID=0bd88d64-01
MAJOR=254
MINOR=4
SEQNUM=4250
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1302954371373

--- debootstrap ---

KERNEL[1303081.676617] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4251
SUBSYSTEM=block

UDEV  [1303081.683144] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
ID_PART_TABLE_TYPE=dos
ID_PART_TABLE_UUID=0bd88d64
MAJOR=7
MINOR=0
SEQNUM=4251
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=13952290172

KERNEL[1303084.095964] remove   /devices/virtual/block/dm-4 (block)
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_COOKIE=6291961
MAJOR=254
MINOR=4
SEQNUM=4252
SUBSYSTEM=block

UDEV  [1303084.108909] remove   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=ext4
ACTION=remove
DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-partuuid/0bd88d64-01 /dev/disk/by-id/dm-name-loop0p1 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-uuid/5fa02639-e3a9-4efa-b36b-45137163844b
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
DM_COOKIE=6291961
DM_NAME=loop0p1
DM_PART=1
DM_STATE=ACTIVE
DM_SUSPENDED=0
DM_TABLE_STATE=LIVE
DM_TYPE=raid
DM_UDEV_DISABLE_LIBRARY_FALLBACK_FLAG=1
DM_UDEV_PRIMARY_SOURCE_FLAG=1
DM_UDEV_RULES=1
DM_UUID=part1-loop0
ID_FS_TYPE=ext4
ID_FS_USAGE=filesystem
ID_FS_UUID=5fa02639-e3a9-4efa-b36b-45137163844b
ID_FS_UUID_ENC=5fa02639-e3a9-4efa-b36b-45137163844b
ID_FS_VERSION=1.0
ID_PART_ENTRY_DISK=7:0
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_SIZE=19527680
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_UUID=0bd88d64-01
MAJOR=254
MINOR=4
SEQNUM=4252
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=1302954371373

KERNEL[1303084.140184] remove   /devices/virtual/bdi/254:4 (bdi)
ACTION=remove
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4253
SUBSYSTEM=bdi

KERNEL[1303084.140261] remove   /devices/virtual/block/dm-4 (block)
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
MAJOR=254
MINOR=4
SEQNUM=4254
SUBSYSTEM=block

UDEV  [1303084.141047] remove   /devices/virtual/bdi/254:4 (bdi)
ACTION=remove
DEVPATH=/devices/virtual/bdi/254:4
SEQNUM=4253
SUBSYSTEM=bdi
USEC_INITIALIZED=1303084140284

UDEV  [1303084.141143] remove   /devices/virtual/block/dm-4 (block)
.ID_FS_TYPE_NEW=
ACTION=remove
DEVNAME=/dev/dm-4
DEVPATH=/devices/virtual/block/dm-4
DEVTYPE=disk
ID_FS_TYPE=
MAJOR=254
MINOR=4
SEQNUM=4254
SUBSYSTEM=block
USEC_INITIALIZED=1303084140576

KERNEL[1303084.160228] change   /devices/virtual/block/loop0 (block)
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
MAJOR=7
MINOR=0
SEQNUM=4255
SUBSYSTEM=block

UDEV  [1303084.161630] change   /devices/virtual/block/loop0 (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVNAME=/dev/loop0
DEVPATH=/devices/virtual/block/loop0
DEVTYPE=disk
ID_FS_TYPE=
MAJOR=7
MINOR=0
SEQNUM=4255
SUBSYSTEM=block
SYSTEMD_READY=0
TAGS=:systemd:
USEC_INITIALIZED=13952290172

--- /tmp/edited-udevadm-host.txt	2017-09-07 12:49:39.469913912 +0200
+++ /tmp/edited-udevadm-chroot.txt	2017-09-07 12:49:05.989830932 +0200
@@ -26,16 +26,6 @@
 DEVPATH=/devices/virtual/bdi/254:4
 SUBSYSTEM=bdi
 
-KERNEL[] change   /devices/virtual/block/dm-4 (block)
-ACTION=change
-DEVNAME=/dev/dm-4
-DEVPATH=/devices/virtual/block/dm-4
-DEVTYPE=disk
-DM_COOKIE=4235776
-MAJOR=254
-MINOR=4
-SUBSYSTEM=block
-
 UDEV  [] change   /devices/virtual/block/loop0 (block)
 .ID_FS_TYPE_NEW=
 ACTION=change
@@ -44,12 +34,22 @@
 DEVTYPE=disk
 ID_FS_TYPE=
 ID_PART_TABLE_TYPE=dos
-ID_PART_TABLE_UUID=0bd88d64
+ID_PART_TABLE_UUID=91b643c6
 MAJOR=7
 MINOR=0
 SUBSYSTEM=block
 TAGS=:systemd:
 
+KERNEL[] change   /devices/virtual/block/dm-4 (block)
+ACTION=change
+DEVNAME=/dev/dm-4
+DEVPATH=/devices/virtual/block/dm-4
+DEVTYPE=disk
+DM_COOKIE=4194304
+MAJOR=254
+MINOR=4
+SUBSYSTEM=block
+
 UDEV  [] add      /devices/virtual/block/dm-4 (block)
 ACTION=add
 DEVLINKS=/dev/disk/by-id/raid-loop0p1
@@ -74,12 +74,12 @@
 UDEV  [] change   /devices/virtual/block/dm-4 (block)
 .ID_FS_TYPE_NEW=
 ACTION=change
-DEVLINKS=/dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1 /dev/mapper/loop0p1 /dev/disk/by-partuuid/0bd88d64-01
+DEVLINKS=/dev/disk/by-partuuid/91b643c6-01 /dev/mapper/loop0p1 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1
 DEVNAME=/dev/dm-4
 DEVPATH=/devices/virtual/block/dm-4
 DEVTYPE=disk
 DM_ACTIVATION=1
-DM_COOKIE=4235776
+DM_COOKIE=4194304
 DM_NAME=loop0p1
 DM_PART=1
 DM_STATE=ACTIVE
@@ -97,50 +97,7 @@
 ID_PART_ENTRY_SCHEME=dos
 ID_PART_ENTRY_SIZE=19527680
 ID_PART_ENTRY_TYPE=0x83
-ID_PART_ENTRY_UUID=0bd88d64-01
-MAJOR=254
-MINOR=4
-SUBSYSTEM=block
-TAGS=:systemd:
-
-KERNEL[] change   /devices/virtual/block/dm-4 (block)
-ACTION=change
-DEVNAME=/dev/dm-4
-DEVPATH=/devices/virtual/block/dm-4
-DEVTYPE=disk
-MAJOR=254
-MINOR=4
-SUBSYSTEM=block
-
-UDEV  [] change   /devices/virtual/block/dm-4 (block)
-.ID_FS_TYPE_NEW=ext4
-ACTION=change
-DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-uuid/5fa02639-e3a9-4efa-b36b-45137163844b /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-name-loop0p1 /dev/disk/by-partuuid/0bd88d64-01
-DEVNAME=/dev/dm-4
-DEVPATH=/devices/virtual/block/dm-4
-DEVTYPE=disk
-DM_NAME=loop0p1
-DM_PART=1
-DM_STATE=ACTIVE
-DM_SUSPENDED=0
-DM_TABLE_STATE=LIVE
-DM_TYPE=raid
-DM_UDEV_PRIMARY_SOURCE_FLAG=1
-DM_UDEV_RULES=1
-DM_UUID=part1-loop0
-ID_FS_TYPE=ext4
-ID_FS_USAGE=filesystem
-ID_FS_UUID=5fa02639-e3a9-4efa-b36b-45137163844b
-ID_FS_UUID_ENC=5fa02639-e3a9-4efa-b36b-45137163844b
-ID_FS_VERSION=1.0
-ID_PART_ENTRY_DISK=7:0
-ID_PART_ENTRY_FLAGS=0x80
-ID_PART_ENTRY_NUMBER=1
-ID_PART_ENTRY_OFFSET=2048
-ID_PART_ENTRY_SCHEME=dos
-ID_PART_ENTRY_SIZE=19527680
-ID_PART_ENTRY_TYPE=0x83
-ID_PART_ENTRY_UUID=0bd88d64-01
+ID_PART_ENTRY_UUID=91b643c6-01
 MAJOR=254
 MINOR=4
 SUBSYSTEM=block
@@ -165,7 +122,7 @@
 DEVTYPE=disk
 ID_FS_TYPE=
 ID_PART_TABLE_TYPE=dos
-ID_PART_TABLE_UUID=0bd88d64
+ID_PART_TABLE_UUID=91b643c6
 MAJOR=7
 MINOR=0
 SUBSYSTEM=block
@@ -176,19 +133,20 @@
 DEVNAME=/dev/dm-4
 DEVPATH=/devices/virtual/block/dm-4
 DEVTYPE=disk
-DM_COOKIE=6291961
+DM_COOKIE=6291456
 MAJOR=254
 MINOR=4
 SUBSYSTEM=block
 
 UDEV  [] remove   /devices/virtual/block/dm-4 (block)
-.ID_FS_TYPE_NEW=ext4
+.ID_FS_TYPE_NEW=
 ACTION=remove
-DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-partuuid/0bd88d64-01 /dev/disk/by-id/dm-name-loop0p1 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-uuid/5fa02639-e3a9-4efa-b36b-45137163844b
+DEVLINKS=/dev/mapper/loop0p1 /dev/disk/by-partuuid/91b643c6-01 /dev/disk/by-id/raid-loop0p1 /dev/disk/by-id/dm-uuid-part1-loop0 /dev/disk/by-id/dm-name-loop0p1
 DEVNAME=/dev/dm-4
 DEVPATH=/devices/virtual/block/dm-4
 DEVTYPE=disk
-DM_COOKIE=6291961
+DM_ACTIVATION=1
+DM_COOKIE=6291456
 DM_NAME=loop0p1
 DM_PART=1
 DM_STATE=ACTIVE
@@ -199,11 +157,7 @@
 DM_UDEV_PRIMARY_SOURCE_FLAG=1
 DM_UDEV_RULES=1
 DM_UUID=part1-loop0
-ID_FS_TYPE=ext4
-ID_FS_USAGE=filesystem
-ID_FS_UUID=5fa02639-e3a9-4efa-b36b-45137163844b
-ID_FS_UUID_ENC=5fa02639-e3a9-4efa-b36b-45137163844b
-ID_FS_VERSION=1.0
+ID_FS_TYPE=
 ID_PART_ENTRY_DISK=7:0
 ID_PART_ENTRY_FLAGS=0x80
 ID_PART_ENTRY_NUMBER=1
@@ -211,7 +165,7 @@
 ID_PART_ENTRY_SCHEME=dos
 ID_PART_ENTRY_SIZE=19527680
 ID_PART_ENTRY_TYPE=0x83
-ID_PART_ENTRY_UUID=0bd88d64-01
+ID_PART_ENTRY_UUID=91b643c6-01
 MAJOR=254
 MINOR=4
 SUBSYSTEM=block

Reply to:

Follow-Ups:
- Re: Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter
  - From: Ben Hutchings <ben@decadent.org.uk>

References:
- Re: Bug#872999: qemu image built by vmdebootstrap is unbootable due to bad root=/dev/mapper/loop0p1 kernel parameter
  - From: Raphael Hertzog <hertzog@debian.org>

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