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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1465808

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1465808

Title:
  Hibernation fails due to a non-reachable cifs mount

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This happened twice during the last weeks with different kernel
  versions on Kubuntu 15.04 (latest kernel images released). Steps
  taken:

  1) Mount cifs: sudo mount -t cifs -ouser=admin //x.y.z.a/video /home/packi/video/
  2) Watch movies (VLC startet using dolphin)
  3) Hibernate
  4) Wake-up at work (server no longer reachable)
  5) Try to hibernate at work after 9 hours

  Output of dmesg:

  [224051.133206] PM: Syncing filesystems ... done.
  [224051.174400] PM: Preparing system for freeze sleep
  [224051.174567] Freezing user space processes ...
  [224071.207476] Freezing of tasks failed after 20.008 seconds (1 tasks refusing to freeze, wq_busy=0):
  [224071.207529] dolphin         D ffff880320a0b968     0 31153   1787 0x00000004
  [224071.207532]  ffff880320a0b968 ffff8802799a93a0 0000000000014200 ffff880320a0bfd8
  [224071.207534]  0000000000014200 ffff88046c2d93a0 ffff8802799a93a0 0000000020a0b948
  [224071.207536]  ffff8800648c79b8 ffff8800648c79bc ffff8802799a93a0 00000000ffffffff
  [224071.207538] Call Trace:
  [224071.207545]  [<ffffffff817c54e9>] schedule_preempt_disabled+0x29/0x70
  [224071.207548]  [<ffffffff817c73a5>] __mutex_lock_slowpath+0x95/0x100
  [224071.207550]  [<ffffffff817c7433>] mutex_lock+0x23/0x40
  [224071.207566]  [<ffffffffc0b89f90>] SendReceive+0x90/0x310 [cifs]
  [224071.207570]  [<ffffffffc0b637f5>] ? smb_init+0x45/0x60 [cifs]
  [224071.207575]  [<ffffffffc0b63a54>] CIFSSMBNegotiate+0x114/0x6c0 [cifs]
  [224071.207583]  [<ffffffffc0b92f33>] cifs_negotiate+0x43/0x60 [cifs]
  [224071.207589]  [<ffffffffc0b73e9f>] cifs_negotiate_protocol+0x7f/0xe0 [cifs]
  [224071.207593]  [<ffffffffc0b634c2>] cifs_reconnect_tcon+0xb2/0x320 [cifs]
  [224071.207598]  [<ffffffffc0b637de>] smb_init+0x2e/0x60 [cifs]
  [224071.207603]  [<ffffffffc0b6a51a>] CIFSSMBUnixQPathInfo+0x7a/0x300 [cifs]
  [224071.207609]  [<ffffffffc0b82446>] cifs_get_inode_info_unix+0x86/0x200 [cifs]
  [224071.207614]  [<ffffffff811fd8e1>] ? complete_walk+0x51/0x100
  [224071.207616]  [<ffffffff81203180>] ? path_lookupat+0x60/0xc90
  [224071.207619]  [<ffffffff811d68c9>] ? __kmalloc+0x1c9/0x280
  [224071.207624]  [<ffffffffc0b76156>] ? build_path_from_dentry+0xb6/0x2c0 [cifs]
  [224071.207629]  [<ffffffffc0b76156>] ? build_path_from_dentry+0xb6/0x2c0 [cifs]
  [224071.207635]  [<ffffffffc0b84abc>] cifs_revalidate_dentry_attr+0xbc/0x200 [cifs]
  [224071.207641]  [<ffffffffc0b84cb5>] cifs_getattr+0x55/0x130 [cifs]
  [224071.207643]  [<ffffffff811f85bc>] vfs_getattr_nosec+0x2c/0x40
  [224071.207644]  [<ffffffff811f867d>] vfs_getattr+0x2d/0x40
  [224071.207646]  [<ffffffff811f8754>] vfs_fstatat+0x64/0xa0
  [224071.207647]  [<ffffffff811f8c22>] SYSC_newlstat+0x22/0x40
  [224071.207649]  [<ffffffff811f8e6e>] SyS_newlstat+0xe/0x10
  [224071.207652]  [<ffffffff817c990d>] system_call_fastpath+0x16/0x1b

  The task in question is hanging and can't be killed by -KILL or -TERM.
  I also couldn't umount the mount using 'umount -f'.

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