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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1825136

Title:
  ubuntu_nbd_smoke_test failed with 4.15 kernel

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  ubuntu_nbd_smoke_test is failing with 4.15 kernel, can be reproduced
  on KVM / bare metals:

  creating backing nbd image /tmp/nbd_image.img

  
--------------------------------------------------------------------------------
  Image path: /tmp/nbd_image.img
  Mount point: /mnt/nbd-test-11013
  Date: Fri Apr 12 00:41:45 UTC 2019
  Host: curly
  Kernel: 4.15.0-48-generic #51-Ubuntu SMP Wed Apr 3 08:28:49 UTC 2019
  Machine: curly x86_64 x86_64
  CPUs online: 2
  CPUs total: 2
  Page size: 4096
  Pages avail: 249824
  Pages total: 510259
  Free space:
  Filesystem Size Used Avail Use% Mounted on
  udev 967M 0 967M 0% /dev
  tmpfs 200M 752K 199M 1% /run
  /dev/vda1 7.3G 4.1G 2.9G 59% /
  tmpfs 997M 0 997M 0% /dev/shm
  tmpfs 5.0M 0 5.0M 0% /run/lock
  tmpfs 997M 0 997M 0% /sys/fs/cgroup
  tmpfs 200M 0 200M 0% /run/user/1000
  
--------------------------------------------------------------------------------

  NBD device /dev/nbd0 created
  found nbd export
  NBD exports found:
  test
  starting client with NBD device /dev/nbd0
  Negotiation: ..size = 128MB
  creating ext4 on /dev/nbd0
  mkfs on /dev/nbd0 succeeded after 0 attempt(s)
  checking ext4 on /dev/nbd0
  fsck from util-linux 2.31.1
  /dev/nbd0: clean, 11/32768 files, 9787/131072 blocks

  mount:
  /dev/nbd0 on /mnt/nbd-test-11013 type ext4 (rw,relatime,data=ordered)
  mounted on /dev/nbd0

  free:
  Filesystem 1K-blocks Used Available Use% Mounted on
  /dev/nbd0 122835 1550 112111 2% /mnt/nbd-test-11013

  creating large file /mnt/nbd-test-11013/largefile
  -rw-r--r-- 1 root root 100M Apr 12 00:41 /mnt/nbd-test-11013/largefile

  free:
  Filesystem 1K-blocks Used Available Use% Mounted on
  /dev/nbd0 122835 103951 9710 92% /mnt/nbd-test-11013

  removing file /mnt/nbd-test-11013/largefile
  unmounting /mnt/nbd-test-11013
  stopping client
  disconnect, sock, done
  Found kernel warning, IO error and/or call trace
  echo
  [ 487.485530] creating backing nbd image /tmp/nbd_image.img
  [ 489.055452] NBD device /dev/nbd0 created
  [ 489.755524] found nbd export
  [ 490.810667] starting client with NBD device /dev/nbd0
  [ 490.819578] creating ext4 on /dev/nbd0
  [ 491.171437] mkfs on /dev/nbd0 succeeded after 0 attempt(s)
  [ 491.369456] checking ext4 on /dev/nbd0
  [ 491.391980] EXT4-fs (nbd0): mounted filesystem with ordered data mode. 
Opts: (null)
  [ 491.403665] mounted on /dev/nbd0
  [ 491.406022] creating large file /mnt/nbd-test-11013/largefile
  [ 492.853579] removing file /mnt/nbd-test-11013/largefile
  [ 493.011021] unmounting /mnt/nbd-test-11013
  [ 494.062904] stopping client
  [ 494.066127] block nbd0: NBD_DISCONNECT
  [ 494.066593] block nbd0: shutting down sockets
  [ 494.066983] nbd0: detected capacity change from 0 to 134217728
  [ 494.067033] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.068313] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.069987] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.070790] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.071799] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.072608] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.073606] ldm_validate_partition_table(): Disk read failed.
  [ 494.073613] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.074400] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.075390] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.076206] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.077208] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.077995] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.078985] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.079772] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.080771] Dev nbd0: unable to read RDB block 0
  [ 494.081734] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.082522] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.083518] print_req_error: I/O error, dev nbd0, sector 24
  [ 494.084465] Buffer I/O error on dev nbd0, logical block 3, async page read
  [ 494.085729] print_req_error: I/O error, dev nbd0, sector 0
  [ 494.086517] Buffer I/O error on dev nbd0, logical block 0, async page read
  [ 494.087509] nbd0: unable to read partition table
  [ 494.171320] Found kernel warning, IO error and/or call trace
  [ 494.171374] echo
  killing server
  
================================================================================

  Completed

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-1036-oem 4.15.0-1036.41
  ProcVersionSignature: User Name 4.15.0-1036.41-oem 4.15.18
  Uname: Linux 4.15.0-1036-oem x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  Date: Wed Apr 17 08:44:35 2019
  SourcePackage: linux-signed-oem
  UpgradeStatus: No upgrade log present (probably fresh install)

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