So, I think the issue I've been having *may* be related.

I store a bunch of junk on an LVM and I needed to expand that a bit. So
I created a "virtual disk" using dd and losetup to expand my LVM.

Everything seems fine, but after some case that I'm having a hard time
identifying, I cease to be able to view certain parts of the file system
on my LVM and my dmesg and /var/log/messages get flooded with stuff like

[code]
CIFS VFS: Unexpected lookup error -112
[/code]

and

[code]
Mar 21 07:59:52 Dauntless kernel: [35010.428444] rm            D 
ffffffff80234069     0  8160  21157
Mar 21 07:59:52 Dauntless kernel: [35010.428449]  ffff88009783fe28 
0000000000000086 ffff88008aa606c8 ffffffff806e2700
Mar 21 07:59:52 Dauntless kernel: [35010.428455]  ffffffff807a6400 
ffffffff807a6400 ffffffff807a6400 ffffffff807a6400
Mar 21 07:59:52 Dauntless kernel: [35010.428460]  ffffffff807a6400 
ffffffff807a6400 ffffffff807a6400 ffffffff807a6400
Mar 21 07:59:52 Dauntless kernel: [35010.428465] Call Trace:
Mar 21 07:59:52 Dauntless kernel: [35010.428469]  [<ffffffff802f5f1f>] ? 
path_walk+0xcf/0xe0
Mar 21 07:59:52 Dauntless kernel: [35010.428473]  [<ffffffff80502435>] 
__mutex_lock_slowpath+0x85/0xd0
Mar 21 07:59:52 Dauntless kernel: [35010.428478]  [<ffffffff805021d3>] 
mutex_lock+0x23/0x30
Mar 21 07:59:52 Dauntless kernel: [35010.428481]  [<ffffffff802f667f>] 
do_unlinkat+0x8f/0x1d0
Mar 21 07:59:52 Dauntless kernel: [35010.428485]  [<ffffffff802f8c13>] ? 
do_vfs_ioctl+0x273/0x2f0
Mar 21 07:59:52 Dauntless kernel: [35010.428489]  [<ffffffff802f6922>] 
sys_unlinkat+0x22/0x40
Mar 21 07:59:52 Dauntless kernel: [35010.428493]  [<ffffffff8021285a>] 
system_call_fastpath+0x16/0x1b
[/code]

Also..

[code]
Mar 19 22:03:34 Dauntless kernel: [ 2307.472136] smbd          D 
ffffffff80234069     0  8729   8501
Mar 19 22:03:34 Dauntless kernel: [ 2307.472142]  ffff88003f52dad8 
0000000000000082 ffff88003c9fde00 ffffffff806e0710
Mar 19 22:03:34 Dauntless kernel: [ 2307.472149]  ffffffff807a6400 
ffffffff807a6400 ffffffff807a6400 ffffffff807a6400
Mar 19 22:03:34 Dauntless kernel: [ 2307.472154]  ffffffff807a6400 
ffffffff807a6400 ffffffff807a6400 ffffffff807a6400
Mar 19 22:03:34 Dauntless kernel: [ 2307.472159] Call Trace:
Mar 19 22:03:34 Dauntless kernel: [ 2307.472170]  [<ffffffff802ac615>] ? 
__filemap_fdatawrite_range+0x55/0x70
Mar 19 22:03:34 Dauntless kernel: [ 2307.472177]  [<ffffffff80502435>] 
__mutex_lock_slowpath+0x85/0xd0
Mar 19 22:03:34 Dauntless kernel: [ 2307.472193]  [<ffffffffa0d695f8>] ? 
_FreeXid+0x28/0x30 [cifs]
Mar 19 22:03:34 Dauntless kernel: [ 2307.472198]  [<ffffffff805021d3>] 
mutex_lock+0x23/0x30
Mar 19 22:03:34 Dauntless kernel: [ 2307.472202]  [<ffffffff802f4b1e>] 
real_lookup+0x3e/0x170
Mar 19 22:03:34 Dauntless kernel: [ 2307.472206]  [<ffffffff802f4d00>] 
do_lookup+0xb0/0x110
Mar 19 22:03:34 Dauntless kernel: [ 2307.472209]  [<ffffffff802f536d>] 
__link_path_walk+0x60d/0xc20
Mar 19 22:03:34 Dauntless kernel: [ 2307.472214]  [<ffffffff802f5b6f>] 
do_follow_link+0x1ef/0x320
Mar 19 22:03:34 Dauntless kernel: [ 2307.472217]  [<ffffffff802f54ec>] 
__link_path_walk+0x78c/0xc20
Mar 19 22:03:34 Dauntless kernel: [ 2307.472222]  [<ffffffff803061b6>] ? 
mntput_no_expire+0x36/0x160
Mar 19 22:03:34 Dauntless kernel: [ 2307.472225]  [<ffffffff802f5ebe>] 
path_walk+0x6e/0xe0
Mar 19 22:03:34 Dauntless kernel: [ 2307.472229]  [<ffffffff802f60d3>] 
do_path_lookup+0xe3/0x200
Mar 19 22:03:34 Dauntless kernel: [ 2307.472232]  [<ffffffff802f3ada>] ? 
getname+0x4a/0xb0
Mar 19 22:03:34 Dauntless kernel: [ 2307.472236]  [<ffffffff802f6f2b>] 
user_path_at+0x7b/0xb0
Mar 19 22:03:34 Dauntless kernel: [ 2307.472239]  [<ffffffff802fc603>] ? 
vfs_lock_file+0x43/0x50
Mar 19 22:03:34 Dauntless kernel: [ 2307.472243]  [<ffffffff802fbc23>] ? 
locks_free_lock+0x43/0x60
Mar 19 22:03:34 Dauntless kernel: [ 2307.472247]  [<ffffffff802ee0ed>] 
vfs_stat_fd+0x2d/0x60
Mar 19 22:03:34 Dauntless kernel: [ 2307.472251]  [<ffffffff802ee1cc>] 
sys_newstat+0x2c/0x50
Mar 19 22:03:34 Dauntless kernel: [ 2307.472254]  [<ffffffff802f8416>] ? 
do_fcntl+0x36/0x290
Mar 19 22:03:34 Dauntless kernel: [ 2307.472259]  [<ffffffff802eb3d9>] ? 
fput+0x9/0x30
Mar 19 22:03:34 Dauntless kernel: [ 2307.472262]  [<ffffffff802f86e0>] ? 
sys_fcntl+0x70/0x90
Mar 19 22:03:34 Dauntless kernel: [ 2307.472267]  [<ffffffff8021285a>] 
system_call_fastpath+0x16/0x1b
[/code]

So, like I said, I'm not sure this is related.. But I think it may well
be. Though losetup's involvement may be somewhat too obscure for this
post to help much.

-- 
losetup 32bit offset limit, hangs on retry, remains defunct
https://bugs.launchpad.net/bugs/313385
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