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[Patrick Stählin <me@xxxxxxxx>]

Confirming manually as apport-collect is broken on Kubuntu, see #1439784

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

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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:
  Confirmed

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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