Description of problem:
[ 7926.842650] Freezing user space processes ... 
[ 7946.816746] Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
[ 7946.816810] umount          D ffff88023bfb49e8     0  5316   5298 0x00800004
[ 7946.816818]  ffff8801f375f908 0000000000000086 ffff88023bd8dd80 ffff880190479db8
[ 7946.816826]  ffff880222ecae60 ffff8801f375ffd8 ffff8801f375ffd8 0000000000012f80
[ 7946.816833]  ffff88021e499730 ffff880222ecae60 ffff88023bfb49e8 0000000000000246
[ 7946.816836] Call Trace:
[ 7946.816859]  [<ffffffffa02fa943>] ? rpc_queue_empty+0x2e/0x2e [sunrpc]
[ 7946.816866]  [<ffffffff814b5daf>] schedule+0x5a/0x5c
[ 7946.816873]  [<ffffffffa02fa977>] rpc_wait_bit_killable+0x34/0x38 [sunrpc]
[ 7946.816876]  [<ffffffff814b62c2>] __wait_on_bit+0x48/0x7b
[ 7946.816882]  [<ffffffff8106e998>] ? queue_work_on+0x37/0x47
[ 7946.816884]  [<ffffffff814b6367>] out_of_line_wait_on_bit+0x72/0x7d
[ 7946.816891]  [<ffffffffa02fa943>] ? rpc_queue_empty+0x2e/0x2e [sunrpc]
[ 7946.816894]  [<ffffffff8107340b>] ? autoremove_wake_function+0x3d/0x3d
[ 7946.816901]  [<ffffffffa02fb5a0>] __rpc_execute+0xf0/0x293 [sunrpc]
[ 7946.816909]  [<ffffffffa02fb7b0>] rpc_execute+0x3f/0x44 [sunrpc]
[ 7946.816915]  [<ffffffffa02f4e04>] rpc_run_task+0x86/0x8e [sunrpc]
[ 7946.816920]  [<ffffffffa02f4ef9>] rpc_call_sync+0x45/0x66 [sunrpc]
[ 7946.816939]  [<ffffffffa03f870e>] _nfs4_call_sync+0x21/0x23 [nfs]
[ 7946.816950]  [<ffffffffa03f5e25>] nfs4_call_sync+0x16/0x18 [nfs]
[ 7946.816961]  [<ffffffffa03f6e49>] _nfs4_proc_getattr+0x97/0xa5 [nfs]
[ 7946.816973]  [<ffffffffa03fa258>] nfs4_proc_getattr+0x36/0x55 [nfs]
[ 7946.816981]  [<ffffffffa03e5015>] __nfs_revalidate_inode+0xb4/0x1a2 [nfs]
[ 7946.816988]  [<ffffffffa03e5258>] nfs_revalidate_inode+0x4a/0x51 [nfs]
[ 7946.816994]  [<ffffffffa03e0f42>] nfs_check_verifier+0x4d/0x70 [nfs]
[ 7946.817000]  [<ffffffffa03e109d>] nfs_lookup_revalidate+0xfa/0x371 [nfs]
[ 7946.817007]  [<ffffffffa03e1f9e>] nfs_open_revalidate+0x187/0x196 [nfs]
[ 7946.817011]  [<ffffffff8113259b>] complete_walk+0xa5/0xcb
[ 7946.817014]  [<ffffffff811337d1>] path_lookupat+0x230/0x29c
[ 7946.817018]  [<ffffffff81043ff3>] ? should_resched+0xe/0x2d
[ 7946.817022]  [<ffffffff8122a741>] ? __strncpy_from_user+0x1e/0x48
[ 7946.817024]  [<ffffffff81133864>] do_path_lookup+0x27/0x96
[ 7946.817027]  [<ffffffff811351ea>] user_path_at_empty+0x53/0x92
[ 7946.817031]  [<ffffffff811171b1>] ? virt_to_head_page+0xe/0x31
[ 7946.817034]  [<ffffffff81118ca8>] ? kmem_cache_free+0x1e/0xab
[ 7946.817037]  [<ffffffff81140367>] ? mntput_no_expire+0x2b/0xd1
[ 7946.817038]  [<ffffffff81140433>] ? mntput+0x26/0x28
[ 7946.817042]  [<ffffffff8112ce36>] sys_readlinkat+0x3b/0xa0
[ 7946.817044]  [<ffffffff8112ceb6>] sys_readlink+0x1b/0x1d
[ 7946.817048]  [<ffffffff814bd9c2>] system_call_fastpath+0x16/0x1b
[ 7946.817050] 
[ 7946.817052] Restarting tasks ... done.

Version-Release number of selected component (if applicable):
3.1.4-1.fc16.x86_64

How reproducible:
Sometimes.

Steps to Reproduce:
1. Attempt to suspend.
  
Actual results:
Fails to suspend.

Expected results:
Should always suspend (it mostly does)

Additional info: