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

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https://bugs.launchpad.net/bugs/1697544

Title:
  /sbin/mdadm --examine --scan --config=partitions hangs in RAIDVERSION
  ioctl

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  '/sbin/mdadm --examine --scan --config=partitions' hangs. This can be
  trivially reproduced when updating a kernel or updating the initramfs,
  or just running the program directly.

  Relevant excerpt from stracing the process:

  [...]
  getdents(4, /* 0 entries */, 65536)     = 0
  close(4)                                = 0
  read(3, "", 1024)                       = 0
  close(3)                                = 0
  open("/dev/dm-9", O_RDONLY|O_DIRECT)    = 3
  fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(252, 9), ...}) = 0
  ioctl(3, RAID_VERSION

  
  /dev/dm-9 on this system is "mpathg", a standard disk claimed by multipathd. 
I cannot find anything relevant to this ioctl in multipath itself.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-72-generic 4.4.0-72.93
  ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
  Uname: Linux 4.4.0-72-generic ppc64le
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 11 18:34 seq
   crw-rw---- 1 root audio 116, 33 Apr 11 18:34 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: ppc64el
  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: Mon Jun 12 20:23:08 2017
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: root=/dev/mapper/mpath0-part2 ro console=hvc0
  ProcLoadAvg: 0.73 0.72 0.93 2/3127 150908
  ProcSwaps:
   Filename                             Type            Size    Used    Priority
   /swap.img                               file         8388544 0       -1
  ProcVersion: Linux version 4.4.0-72-generic (buildd@bos01-ppc64el-022) (gcc 
version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.4) ) #93-Ubuntu SMP Fri 
Mar 31 14:05:15 UTC 2017
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-72-generic N/A
   linux-backports-modules-4.4.0-72-generic  N/A
   linux-firmware                            1.157.8
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  cpu_cores: Number of cores present = 20
  cpu_coreson: Number of cores online = 20
  cpu_dscr: DSCR is 0
  cpu_freq:
   min: 3.691 GHz (cpu 152)
   max: 3.691 GHz (cpu 8)
   avg: 3.691 GHz
  cpu_runmode:
   Could not retrieve current diagnostics mode,
   No kernel interface to firmware
  cpu_smt: SMT is off

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