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[Bug 1813713] Re: ubuntu_nbd_smoke_test failed with kernel warning on X-4.15 i386

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This is also affecting xenial/linux (only i386 as well):
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20190201_082722_4cb3e@/log.gz

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-hwe (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-hwe (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux-hwe (Ubuntu Bionic)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1813713

Title:
  ubuntu_nbd_smoke_test failed with kernel warning on X-4.15 i386

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-hwe package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  New
Status in linux-hwe source package in Xenial:
  New
Status in linux source package in Bionic:
  New
Status in linux-hwe source package in Bionic:
  Invalid

Bug description:
  Issue found on a i386 SUT with X-4.15 generic / low-latency kernel:
    creating backing nbd image /tmp/nbd_image.img

    --------------------------------------------------------------------------------
    Image path:    /tmp/nbd_image.img
    Mount point:   /mnt/nbd-test-12309
    Date:          Tue Jan 29 06:30:51 UTC 2019
    Host:          pepe
    Kernel:        4.15.0-43-lowlatency #46~16.04.1-Ubuntu SMP PREEMPT Fri Dec 7 16:13:34 UTC 2018
    Machine:       pepe i686 i686
    CPUs online:   8
    CPUs total:    8
    Page size:     4096
    Pages avail:   1824175
    Pages total:   2069973
    Free space:
    Filesystem      Size  Used Avail Use% Mounted on
    udev            4.0G     0  4.0G   0% /dev
    tmpfs           809M  8.8M  800M   2% /run
    /dev/sda1       275G  5.8G  255G   3% /
    tmpfs           4.0G     0  4.0G   0% /dev/shm
    tmpfs           5.0M     0  5.0M   0% /run/lock
    tmpfs           4.0G     0  4.0G   0% /sys/fs/cgroup
    tmpfs           809M     0  809M   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 2.27.1
    /dev/nbd0: clean, 11/32768 files, 9787/131072 blocks

    mount:
    /dev/nbd0 on /mnt/nbd-test-12309 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-12309

    creating large file /mnt/nbd-test-12309/largefile
    -rw-r--r-- 1 root root 100M Jan 29 06:30 /mnt/nbd-test-12309/largefile

    free:
    Filesystem     1K-blocks   Used Available Use% Mounted on
    /dev/nbd0         122835 103951      9710  92% /mnt/nbd-test-12309

    removing file /mnt/nbd-test-12309/largefile
    unmounting /mnt/nbd-test-12309
    stopping client
    disconnect, sock, done
    Found kernel warning, IO error and/or call trace
    echo
    [  144.498338] creating backing nbd image /tmp/nbd_image.img
    [  145.668377] NBD device /dev/nbd0 created
    [  145.716876] found nbd export
    [  146.760018] starting client with NBD device /dev/nbd0
    [  146.761655] creating ext4 on /dev/nbd0
    [  147.007051] mkfs on /dev/nbd0 succeeded after 0 attempt(s)
    [  147.171873] checking ext4 on /dev/nbd0
    [  147.222034] EXT4-fs (nbd0): mounted filesystem with ordered data mode. Opts: (null)
    [  147.226224] mounted on /dev/nbd0
    [  147.227449] creating large file /mnt/nbd-test-12309/largefile
    [  147.940687] removing file /mnt/nbd-test-12309/largefile
    [  148.007125] unmounting /mnt/nbd-test-12309
    [  149.048638] stopping client
    [  149.049176] block nbd0: NBD_DISCONNECT
    [  149.049200] block nbd0: shutting down sockets
    [  149.049320] nbd0: detected capacity change from 0 to 134217728
    [  149.049346] print_req_error: I/O error, dev nbd0, sector 0
    [  149.055116] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.062402] print_req_error: I/O error, dev nbd0, sector 0
    [  149.068078] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.075363] print_req_error: I/O error, dev nbd0, sector 0
    [  149.080923] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.087847] ldm_validate_partition_table(): Disk read failed.
    [  149.087861] print_req_error: I/O error, dev nbd0, sector 0
    [  149.093442] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.100409] print_req_error: I/O error, dev nbd0, sector 0
    [  149.105988] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.112912] print_req_error: I/O error, dev nbd0, sector 0
    [  149.118544] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.125537] print_req_error: I/O error, dev nbd0, sector 0
    [  149.131027] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.138007] Dev nbd0: unable to read RDB block 0
    [  149.142647] print_req_error: I/O error, dev nbd0, sector 0
    [  149.148182] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.155213] print_req_error: I/O error, dev nbd0, sector 24
    [  149.160837] Buffer I/O error on dev nbd0, logical block 3, async page read
    [  149.167846] print_req_error: I/O error, dev nbd0, sector 0
    [  149.173363] Buffer I/O error on dev nbd0, logical block 0, async page read
    [  149.180357]  nbd0: unable to read partition table
    [  149.696627] Found kernel warning, IO error and/or call trace
    [  149.696665] echo
    killing server
    ================================================================================

    Completed

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.15.0-43-lowlatency 4.15.0-43.46~16.04.1
  ProcVersionSignature: User Name 4.15.0-43.46~16.04.1-lowlatency 4.15.18
  Uname: Linux 4.15.0-43-lowlatency i686
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: i386
  Date: Tue Jan 29 06:33:16 2019
  SourcePackage: linux-hwe
  UpgradeStatus: No upgrade log present (probably fresh install)

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