[Unionfs] Stuck process while trying to mount an unionfs in 2.6.25

[Herton Ronaldo Krzesinski]

Hi,

Today while testing I found I was unable to mount an unionfs on 2.6.25, at 
least here any mount gets stuck:

Registering unionfs 2.3.3 (for 2.6.25)
SysRq : Show Blocked State
  task                PC stack   pid father
mount         D 00000000     0   995      1
       debafcf0 00000086 c019d804 00000000 c0415020 deb86e50 00000000 debafce0 
       c5940aa4 00000096 c048c1c0 c048f1e0 c048f1e0 c048f1e0 deb86e50 deb870a0 
       c13f91e0 00000000 debae000 e00fff9b 0007ad1e 00000000 00000001 dec71dc8 
Call Trace:
 [<c019d804>] ? _d_rehash+0x44/0x50
 [<e00fff9b>] ? init_once+0xb/0x10 [unionfs]
 [<c033efcf>] __mutex_lock_slowpath+0x5f/0xa0
 [<c033ee47>] mutex_lock+0x17/0x20
 [<e0107a23>] unionfs_getxattr+0x43/0xc0 [unionfs]
 [<e01079e0>] ? unionfs_getxattr+0x0/0xc0 [unionfs]
 [<c01f3277>] smack_d_instantiate+0xc7/0x160
 [<c01acb06>] ? fsstack_copy_inode_size+0x16/0x70
 [<c01ee2dc>] security_d_instantiate+0x1c/0x20
 [<c019e760>] d_instantiate+0x50/0x60
 [<e00febda>] unionfs_interpose+0x1aa/0x1e0 [unionfs]
 [<e00ff565>] unionfs_read_super+0x855/0xb20 [unionfs]
 [<c020801c>] ? idr_get_empty_slot+0xdc/0x260
 [<c020bd0d>] ? strlcpy+0x1d/0x60
 [<c01a1d32>] ? get_filesystem+0x12/0x30
 [<c018e574>] ? sget+0x2f4/0x320
 [<c018f1d3>] get_sb_nodev+0x43/0x80
 [<e00fe7a7>] unionfs_get_sb+0x27/0x60 [unionfs]
 [<e00fed10>] ? unionfs_read_super+0x0/0xb20 [unionfs]
 [<c018eb18>] vfs_kern_mount+0x58/0x120
 [<c018ec39>] do_kern_mount+0x39/0xd0
 [<c01a4245>] do_new_mount+0x65/0x90
 [<c01a4413>] do_mount+0x1a3/0x1c0
 [<c016c744>] ? __get_free_pages+0x24/0x60
 [<c01a23f5>] ? copy_mount_options+0x35/0x130
 [<c01a449f>] sys_mount+0x6f/0xb0
 [<c0104d90>] sysenter_past_esp+0x6d/0xa5
 =======================
Sched Debug Version: v0.07, 2.6.25.1-desktop-1mnb #1
now at 648519.555457 msecs
  .sysctl_sched_latency                    : 20.000000
  .sysctl_sched_min_granularity            : 4.000000
  .sysctl_sched_wakeup_granularity         : 5.000000
  .sysctl_sched_batch_wakeup_granularity   : 10.000000
  .sysctl_sched_child_runs_first           : 0.000001
  .sysctl_sched_features                   : 15

cpu#0, 897.789 MHz
  .nr_running                    : 2
  .load                          : 2048
  .nr_switches                   : 15227
  .nr_load_updates               : 648506
  .nr_uninterruptible            : 1
  .jiffies                       : 348514
  .next_balance                  : 0.348696
  .curr->pid                     : 985
  .clock                         : 648407.643454
  .idle_clock                    : 7.647405
  .prev_clock_raw                : 679956.129067
  .clock_warps                   : 0
  .clock_overflows               : 11713
  .clock_underflows              : 637043
  .clock_deep_idle_events        : 1
  .clock_max_delta               : 0.999848
  .cpu_load[0]                   : 2048
  .cpu_load[1]                   : 1536
  .cpu_load[2]                   : 1280
  .cpu_load[3]                   : 1152
  .cpu_load[4]                   : 1088

cfs_rq
  .exec_clock                    : 648089.959318
  .MIN_vruntime                  : 647149.353782
  .min_vruntime                  : 647149.353782
  .max_vruntime                  : 647149.353782
  .spread                        : 0.000000
  .spread0                       : 0.000000
  .nr_running                    : 2
  .load                          : 2048
  .bkl_count                     : 2765
  .nr_spread_over                : 4347

runnable tasks:
            task   PID         tree-key  switches  prio     exec-runtime         
sum-exec        sum-sleep
----------------------------------------------------------------------------------------------------------
    nash-hotplug   854    647149.353782      4519   120    647149.353782    
644037.805627         0.000000
R           bash   985    647129.452724        11   120    647129.452724         
5.645286     21625.396175

I'm attaching too my .config as it may help.

-- 
[]'s
Herton
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