Occasionally my laptop will hang when trying to access my home directory. The only fix so far is to reboot and then it goes away for a week.

/var/log/kern.log has the following error:

Nov 21 13:54:39 Laptop1 kernel: [231480.428107] INFO: task ls:10104 blocked for more than 120 seconds.
Nov 21 13:54:39 Laptop1 kernel: [231480.428114] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 21 13:54:39 Laptop1 kernel: [231480.428120] ls              D f5dbf6a0     0 10104   9964 0x00000004
Nov 21 13:54:39 Laptop1 kernel: [231480.428130]  f3edbd40 00000086 00000001 f5dbf6a0 00000000 00000001 c175dfe0 c1868ec0
Nov 21 13:54:39 Laptop1 kernel: [231480.428145]  c1868ec0 054eadaf 0000d250 f5005ec0 ee940cc0 f3e5b300 f3edbcf8 c10e8bfa
Nov 21 13:54:39 Laptop1 kernel: [231480.428159]  f3edbd10 f3edbd10 f3edbd10 c102b505 fffba7e8 089fa000 f3edbd38 c10fb528
Nov 21 13:54:39 Laptop1 kernel: [231480.428173] Call Trace:
Nov 21 13:54:39 Laptop1 kernel: [231480.428189]  [<c10e8bfa>] ? lru_cache_add_lru+0x2a/0x50
Nov 21 13:54:39 Laptop1 kernel: [231480.428199]  [<c102b505>] ? __kunmap_atomic+0x75/0xa0
Nov 21 13:54:39 Laptop1 kernel: [231480.428207]  [<c10fb528>] ? do_anonymous_page+0x1f8/0x280
Nov 21 13:54:39 Laptop1 kernel: [231480.428218]  [<c152b656>] __mutex_lock_slowpath+0xc6/0x120
Nov 21 13:54:39 Laptop1 kernel: [231480.428225]  [<c152b304>] mutex_lock+0x24/0x40
Nov 21 13:54:39 Laptop1 kernel: [231480.428246]  [<f83ab87c>] cifs_reconnect_tcon+0x13c/0x2a0 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428255]  [<c152fa00>] ? vmalloc_fault+0xee/0xee
Nov 21 13:54:39 Laptop1 kernel: [231480.428262]  [<c152fc2f>] ? do_page_fault+0x22f/0x4a0
Nov 21 13:54:39 Laptop1 kernel: [231480.428276]  [<f83abe3c>] smb_init+0x2c/0x90 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428285]  [<c11aa42e>] ? ext4_htree_store_dirent+0x2e/0x120
Nov 21 13:54:39 Laptop1 kernel: [231480.428301]  [<f83b0941>] CIFSSMBQPathInfo+0x41/0x210 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428319]  [<f83c39e4>] ? cifs_get_inode_info+0x224/0x390 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428336]  [<f83c3a21>] cifs_get_inode_info+0x261/0x390 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428354]  [<f83bb35d>] ? build_path_from_dentry+0xcd/0x250 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428362]  [<c102b69e>] ? kmap_atomic_prot+0xde/0x100
Nov 21 13:54:39 Laptop1 kernel: [231480.428370]  [<c152c4cd>] ? _raw_spin_lock+0xd/0x10
Nov 21 13:54:39 Laptop1 kernel: [231480.428388]  [<f83c6378>] ? _GetXid+0x58/0x80 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428405]  [<f83c4f81>] cifs_revalidate_dentry_attr+0x111/0x1a0 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428423]  [<f83c50e2>] cifs_getattr+0x52/0x120 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428431]  [<c112c5b2>] vfs_getattr+0x42/0x70
Nov 21 13:54:39 Laptop1 kernel: [231480.428448]  [<f83c5090>] ? cifs_revalidate_dentry+0x40/0x40 [cifs]
Nov 21 13:54:39 Laptop1 kernel: [231480.428455]  [<c112c647>] vfs_fstatat+0x67/0x80
Nov 21 13:54:39 Laptop1 kernel: [231480.428461]  [<c112c680>] vfs_lstat+0x20/0x30
Nov 21 13:54:39 Laptop1 kernel: [231480.428468]  [<c112c946>] sys_lstat64+0x16/0x30
Nov 21 13:54:39 Laptop1 kernel: [231480.428475]  [<c11341ed>] ? link_path_walk+0x79d/0x8a0    
Nov 21 13:54:39 Laptop1 kernel: [231480.428483]  [<c152c8e4>] syscall_call+0x7/0xb