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[Jürg Häfliger <1809879@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1809879

Title:
  9f03740a956d7ac6a1b8f8c455da6fa5cae11c22 in ubuntu_btrfs_kernel_fixes
  hang with T

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

Bug description:
  Patch 9f03740a956d7ac6a1b8f8c455da6fa5cae11c22 does not exist in
  Trusty kernel tree.

  When running this test, it will hang with Trusty and gets killed by
  the timeout setting (2h), this will cause the following test failed
  with /dev/loop0 mounted issue:

  Invoking test 9f03740a956d7ac6a1b8f8c455da6fa5cae11c22
   
   fix 9f03740a956d7ac6a1b8f8c455da6fa5cae11c22
   
       Btrfs: fix infinite path build loops in incremental send
   
       The send operation processes inodes by their ascending number, and assumes
       that any rename/move operation can be successfully performed (sent to the
       caller) once all previous inodes (those with a smaller inode number than the
       one we're currently processing) were processed.
   
       [ .... ]
   
       Even without this loop, the incremental send couldn't succeed, because it would attempt
       to send a rename/move operation for the lower inode before the highest inode number was
       renamed/move. This issue is easy to trigger with the following steps:
   
         $ mkfs.btrfs -f /dev/sdb3
         $ mount /dev/sdb3 /mnt/btrfs
         $ mkdir -p /mnt/btrfs/a/b/c/d
         $ mkdir /mnt/btrfs/a/b/c2
         $ btrfs subvol snapshot -r /mnt/btrfs /mnt/btrfs/snap1
         $ mv /mnt/btrfs/a/b/c/d /mnt/btrfs/a/b/c2/d2
         $ mv /mnt/btrfs/a/b/c /mnt/btrfs/a/b/c2/d2/cc
         $ btrfs subvol snapshot -r /mnt/btrfs /mnt/btrfs/snap2
         $ btrfs send -p /mnt/btrfs/snap1 /mnt/btrfs/snap2 > /tmp/incremental.send
   
   Create a readonly snapshot of '/tmp/mnt-9f03740a956d7ac6a1b8f8c455da6fa5cae11c22/btrfs' in '/tmp/mnt-9f03740a956d7ac6a1b8f8c455da6fa5cae11c22/btrfs/snap1'
   Create a readonly snapshot of '/tmp/mnt-9f03740a956d7ac6a1b8f8c455da6fa5cae11c22/btrfs' in '/tmp/mnt-9f03740a956d7ac6a1b8f8c455da6fa5cae11c22/btrfs/snap2'
   At subvol /tmp/mnt-9f03740a956d7ac6a1b8f8c455da6fa5cae11c22/btrfs/snap2
  Timer expired (7200 sec.), nuking pid 27517
   		ERROR

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-164-generic 3.13.0-164.214
  ProcVersionSignature: User Name 3.13.0-164.214-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-164-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 27 08:26 seq
   crw-rw---- 1 root audio 116, 33 Dec 27 08:26 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Thu Dec 27 09:21:07 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-164-generic root=UUID=576666e8-9e7f-40ee-934e-f1dce18323e5 ro console=ttyS0,115200n8
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-164-generic N/A
   linux-backports-modules-3.13.0-164-generic  N/A
   linux-firmware                              1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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