[sanity]$ sys_stat .lustre/fid
dev             743766374
ino      144115188109410306
mode                16877
nlink                   2
uid                     0
gid                     0
rdev                    0
size                 4096
blksize              4096
blocks                  8
atime          1345575550
mtime          1345575463
ctime          1345575463

[sanity]$ sys_chmod .lustre/fid 0666
sys_chmod: cannot change mode of `.lustre/fid' to 00666: Operation not permitted

[sanity]$ sys_chown .lustre/fid 7 7
sys_chown: cannot change owner of `.lustre/fid' to uid 7, gid 7: Operation not permitted

[sanity]$ sys_creat .lustre/fid/XXX
sys_creat: cannot create `.lustre/fid/XXX' with mode 0666: Invalid argument

[sanity]$ sys_creat .lustre/fid/[0x1:0x2:0x0]

Lustre: ctl-lustre-MDT0000: super-sequence allocation rc = 0 [0x0000000200000400-0x0000000240000400):0:mdt
Lustre: 7696:0:(mdd_device.c:872:obf_lookup()) bad FID format [XXX], should be [0x1:0x2:0x0]
LustreError: 8033:0:(dir.c:437:ll_get_dir_page()) read cache page: [0x200000002:0x2:0x0] at 0: rc -1
LustreError: 8033:0:(dir.c:613:ll_readdir()) error reading dir [0x200000002:0x2:0x0] at 0: rc -1
LustreError: 7696:0:(osd_compat.c:381:osd_compat_objid_lookup()) ASSERTION( map ) failed: 
LustreError: 7696:0:(osd_compat.c:381:osd_compat_objid_lookup()) LBUG
Pid: 7696, comm: mdt00_002

Call Trace:
 [<ffffffffa0d15905>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
 [<ffffffffa0d15f17>] lbug_with_loc+0x47/0xb0 [libcfs]
 [<ffffffffa0a25ce9>] osd_compat_objid_lookup+0x479/0x520 [osd_ldiskfs]
 [<ffffffffa0a1a545>] osd_oi_lookup+0x55/0xc0 [osd_ldiskfs]
 [<ffffffffa0a107b2>] osd_object_init+0x3b2/0xd20 [osd_ldiskfs]
 [<ffffffffa03e45ce>] ? dt_object_init+0xe/0x10 [obdclass]
 [<ffffffffa03e1305>] lu_object_alloc+0xd5/0x310 [obdclass]
 [<ffffffffa03e18d8>] ? htable_lookup+0x108/0x1c0 [obdclass]
 [<ffffffffa03e1b91>] lu_object_find_at+0x201/0x450 [obdclass]
 [<ffffffff8127ae37>] ? vsscanf+0x617/0x7c0
 [<ffffffffa03e1e1f>] lu_object_find_slice+0x1f/0x80 [obdclass]
 [<ffffffffa0903160>] mdd_object_find+0x10/0x70 [mdd]
 [<ffffffffa092d676>] obf_lookup+0xd6/0x270 [mdd]
 [<ffffffffa0aff146>] cml_lookup+0x66/0x1b0 [cmm]
 [<ffffffffa0a93847>] ? mdt_version_get_check+0x47/0xe0 [mdt]
 [<ffffffffa0aa8537>] mdt_reint_open+0x7a7/0x18a0 [mdt]
 [<ffffffffa092be5e>] ? md_ucred+0x1e/0x60 [mdd]
 [<ffffffffa0a76235>] ? mdt_ucred+0x15/0x20 [mdt]
 [<ffffffffa0a8d97c>] ? mdt_root_squash+0x2c/0x3e0 [mdt]
 [<ffffffffa0a92281>] mdt_reint_rec+0x41/0xe0 [mdt]
 [<ffffffffa0a8bada>] mdt_reint_internal+0x50a/0x810 [mdt]
 [<ffffffffa0a8c0ad>] mdt_intent_reint+0x1ed/0x500 [mdt]
 [<ffffffffa0a882c1>] mdt_intent_policy+0x371/0x6a0 [mdt]
 [<ffffffffa05bb881>] ldlm_lock_enqueue+0x361/0x8f0 [ptlrpc]
 [<ffffffffa05e381f>] ldlm_handle_enqueue0+0x48f/0xf70 [ptlrpc]
 [<ffffffffa0a88636>] mdt_enqueue+0x46/0x130 [mdt]
 [<ffffffffa0a7f932>] mdt_handle_common+0x922/0x1740 [mdt]
 [<ffffffffa0a80825>] mdt_regular_handle+0x15/0x20 [mdt]
 [<ffffffffa061382d>] ptlrpc_server_handle_request+0x40d/0xea0 [ptlrpc]
 [<ffffffffa0d1665e>] ? cfs_timer_arm+0xe/0x10 [libcfs]
 [<ffffffffa060acb7>] ? ptlrpc_wait_event+0xa7/0x2a0 [ptlrpc]
 [<ffffffff810533f3>] ? __wake_up+0x53/0x70
 [<ffffffffa0614e19>] ptlrpc_main+0xb59/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c140>] ? child_rip+0x0/0x20

Kernel panic - not syncing: LBUG
Pid: 7696, comm: mdt00_002 Not tainted 2.6.32-279.5.1.el6.x86_64 #1
Call Trace:
 [<ffffffff814fd58a>] ? panic+0xa0/0x168
 [<ffffffffa0d15f6b>] ? lbug_with_loc+0x9b/0xb0 [libcfs]
 [<ffffffffa0a25ce9>] ? osd_compat_objid_lookup+0x479/0x520 [osd_ldiskfs]
 [<ffffffffa0a1a545>] ? osd_oi_lookup+0x55/0xc0 [osd_ldiskfs]
 [<ffffffffa0a107b2>] ? osd_object_init+0x3b2/0xd20 [osd_ldiskfs]
 [<ffffffffa03e45ce>] ? dt_object_init+0xe/0x10 [obdclass]
 [<ffffffffa03e1305>] ? lu_object_alloc+0xd5/0x310 [obdclass]
 [<ffffffffa03e18d8>] ? htable_lookup+0x108/0x1c0 [obdclass]
 [<ffffffffa03e1b91>] ? lu_object_find_at+0x201/0x450 [obdclass]
 [<ffffffff8127ae37>] ? vsscanf+0x617/0x7c0
 [<ffffffffa03e1e1f>] ? lu_object_find_slice+0x1f/0x80 [obdclass]
 [<ffffffffa0903160>] ? mdd_object_find+0x10/0x70 [mdd]
 [<ffffffffa092d676>] ? obf_lookup+0xd6/0x270 [mdd]
 [<ffffffffa0aff146>] ? cml_lookup+0x66/0x1b0 [cmm]
 [<ffffffffa0a93847>] ? mdt_version_get_check+0x47/0xe0 [mdt]
 [<ffffffffa0aa8537>] ? mdt_reint_open+0x7a7/0x18a0 [mdt]
 [<ffffffffa092be5e>] ? md_ucred+0x1e/0x60 [mdd]
 [<ffffffffa0a76235>] ? mdt_ucred+0x15/0x20 [mdt]
 [<ffffffffa0a8d97c>] ? mdt_root_squash+0x2c/0x3e0 [mdt]
 [<ffffffffa0a92281>] ? mdt_reint_rec+0x41/0xe0 [mdt]
 [<ffffffffa0a8bada>] ? mdt_reint_internal+0x50a/0x810 [mdt]
 [<ffffffffa0a8c0ad>] ? mdt_intent_reint+0x1ed/0x500 [mdt]
 [<ffffffffa0a882c1>] ? mdt_intent_policy+0x371/0x6a0 [mdt]
 [<ffffffffa05bb881>] ? ldlm_lock_enqueue+0x361/0x8f0 [ptlrpc]
 [<ffffffffa05e381f>] ? ldlm_handle_enqueue0+0x48f/0xf70 [ptlrpc]
 [<ffffffffa0a88636>] ? mdt_enqueue+0x46/0x130 [mdt]
 [<ffffffffa0a7f932>] ? mdt_handle_common+0x922/0x1740 [mdt]
 [<ffffffffa0a80825>] ? mdt_regular_handle+0x15/0x20 [mdt]
 [<ffffffffa061382d>] ? ptlrpc_server_handle_request+0x40d/0xea0 [ptlrpc]
 [<ffffffffa0d1665e>] ? cfs_timer_arm+0xe/0x10 [libcfs]
 [<ffffffffa060acb7>] ? ptlrpc_wait_event+0xa7/0x2a0 [ptlrpc]
 [<ffffffff810533f3>] ? __wake_up+0x53/0x70
 [<ffffffffa0614e19>] ? ptlrpc_main+0xb59/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c14a>] ? child_rip+0xa/0x20
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c140>] ? child_rip+0x0/0x20

[sanity]$ sys_getdents .lustre/fid
sys_getdents: cannot read directory `.lustre/fid': Operation not permitted

[sanity]$ sys_lea .lustre/fid
sys_lea: cannot retreive value for attribute `trusted.link' of `.lustre/fid': Operation not permitted

[sanity]$ sys_link .lustre/fid fud
sys_link: cannot link `fud' to `.lustre/fid': Permission denied

[sanity]$ sys_listxattr .lustre/fid
sys_listxattr: cannot retreive extended attribute list for `.lustre/fid': No data available

[sanity]$ sys_lma .lustre/fid
sys_lma: cannot retreive value for attribute `trusted.lma' of `.lustre/fid': Operation not permitted

[sanity]$ sys_lstat .lustre/fid

[sanity]$ sys_mkdir .lustre/fid
sys_mkdir: cannot mkdir `.lustre/fid' with mode 0777: File exists

[sanity]$ sys_mkdir .lustre/fud
sys_mkdir: cannot mkdir `.lustre/fud' with mode 0777: Permission denied

[sanity]$ sys_mkdir .lustre/fid/fud
sys_mkdir: cannot mkdir `.lustre/fid/fud' with mode 0777: Permission denied

[sanity]$ sys_mkdir .lustre/fid/[0x1:0x2:0x0]
sys_mkdir: cannot mkdir `.lustre/fid/[0x1:0x2:0x0]' with mode 0777: Permission denied

[sanity]$ sys_mkdir .lustre/fid/[0x2:0x1:0x0]
sys_mkdir: cannot mkdir `.lustre/fid/[0x2:0x1:0x0]' with mode 0777: Permission denied

[sanity]$ sys_mknod .lustre/fid/XXX r 0 0
cannot create device `.lustre/fid/XXX' mode 100666, maj 0, min 0: Permission denied

[sanity]$ sys_mknod .lustre/fid/[0x0:0x0:0x0] r 0 0
cannot create device `.lustre/fid/[0x0:0x0:0x0]' mode 100666, maj 0, min 0: Permission denied

[sanity]$ sys_mknod .lustre/fid/[0x1:0x2:0x0] r 0 0
cannot create device `.lustre/fid/[0x1:0x2:0x0]' mode 100666, maj 0, min 0: Permission denied

[sanity]$ sys_mknod .lustre/XXX r 0 0
cannot create device `.lustre/XXX' mode 100666, maj 0, min 0: Permission denied

[sanity]$ sys_path2fid .lustre/fid/XXX
cannot open `.lustre/fid/XXX' with flags 0, mode 0666: Invalid argument

[sanity]$ sys_path2fid .lustre/fid/[0x0:0x0:0x0]
cannot open `.lustre/fid/[0x0:0x0:0x0]' with flags 0, mode 0666: Invalid argument

[sanity]$ sys_path2fid .lustre/fid/[0x1:0x2:0x0]

LustreError: 2615:0:(osd_compat.c:381:osd_compat_objid_lookup()) ASSERTION( map ) failed: 
LustreError: 2615:0:(osd_compat.c:381:osd_compat_objid_lookup()) LBUG
...

[sanity]$ sys_readlink .lustre/fid
sys_readlink: cannot read link `.lustre/fid': Invalid argument
[sanity]$ sys_rename .lustre/fid .lustre/fud
cannot rename `.lustre/fid' to `.lustre/fud': Permission denied
[sanity]$ sys_rmdir .lustre/fid
cannot delete directory `.lustre/fid': Permission denied

[sanity]$ sys_stat .lustre/fid
dev             743766374
ino      144115188109410306
mode                16877
nlink                   2
uid                     0
gid                     0
rdev                    0
size                 4096
blksize              4096
blocks                  8
atime          1345577050
mtime          1345577050
ctime          1345577050

[sanity]$ sys_symlink barf .lustre/fid/LINK
cannot create symbolic link `.lustre/fid/LINK' containing `barf': Permission denied

[sanity]$ sys_symlink barf .lustre/LINK
cannot create symbolic link `.lustre/LINK' containing `barf': Permission denied

[sanity]$ sys_truncate .lustre/fid
cannot truncate `.lustre/fid' to length 0: Is a directory

[sanity]$ sys_unlink .lustre/fid
cannot unlink `.lustre/fid': Permission denied

sanity]$ sys_mkdir sanity/XXX

[sanity]$ sys_rename sanity/XXX .lustre/fid
cannot rename `sanity/XXX' to `.lustre/fid': Permission denied

[sanity]$ sys_rename sanity/XXX .lustre/fid/XXX
cannot rename `sanity/XXX' to `.lustre/fid/XXX': Invalid argument

[sanity]$ sys_rename .lustre/fid sanity/XXX
cannot rename `.lustre/fid' to `sanity/XXX': Permission denied










[root]# sys_chown .lustre/fid 7 7 
sys_chown: cannot change owner of `.lustre/fid' to uid 7, gid 7: Operation not permitted

[root]# sys_chmod -- .lustre/fid -1
sys_chmod: cannot change mode of `.lustre/fid' to 37777777777: Operation not permitted

[root]# sys_chmod -- .lustre/fid 0777
sys_chmod: cannot change mode of `.lustre/fid' to 00777: Operation not permitted

[root]# sys_creat .lustre/fud

[root]# sys_getdents .lustre
d            25003 `..'
d 144115188109410305 `.'
r 144115205255725057 `fud'

[root]# sys_stat .lustre/fud
cannot stat `.lustre/fud': No such file or directory

[root]# sys_creat .lustre/fid/XXX
sys_creat: cannot create `.lustre/fid/XXX' with mode 0666: Invalid argument

[root]# sys_creat .lustre/fid/[0x0:0x0:0x0]
sys_creat: cannot create `.lustre/fid/[0x0:0x0:0x0]' with mode 0666: Invalid argument

[root]# sys_creat .lustre/fid/[0x1:0x2:0x0]

LustreError: 2594:0:(osd_compat.c:381:osd_compat_objid_lookup()) ASSERTION( map ) failed: 
...

[root]# sys_getdents .lustre/fid
sys_getdents: cannot read directory `.lustre/fid': Input/output error

[root]# sys_mkdir XXX
[root]# sys_rename XXX .lustre/fid

BUG: unable to handle kernel NULL pointer dereference at 0000000000000340
IP: [<ffffffffa0aa7c90>] osd_xattr_get+0x170/0x350 [osd_ldiskfs]
PGD 7d04e067 PUD 7b5be067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/possible
CPU 0 
Modules linked in: lustre(U) obdfilter(U) ost(U) cmm(U) mdt(U) osd_ldiskfs(U) fsfilt_ldiskfs(U) ldiskfs(U) exportfs mdd(U) mds(U) mgs(U) lquota(U) jbd obdecho(U) mgc(U) lov(U) osc(U) mdc(U) lmv(U) fid(U) fld(U) ptlrpc(U) obdclass(U) lvfs(U) ksocklnd(U) lnet(U) sha512_generic sha256_generic libcfs(U) autofs4 nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 dm_mirror dm_region_hash dm_log dm_mod microcode virtio_balloon virtio_net i2c_piix4 i2c_core ext4 mbcache jbd2 virtio_blk pata_acpi ata_generic ata_piix virtio_pci virtio_ring virtio [last unloaded: speedstep_lib]

Pid: 2597, comm: mdt00_002 Not tainted 2.6.32-279.5.1.el6.x86_64 #1 Bochs Bochs
RIP: 0010:[<ffffffffa0aa7c90>]  [<ffffffffa0aa7c90>] osd_xattr_get+0x170/0x350 [osd_ldiskfs]
RSP: 0018:ffff88006638baa0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffffffff30 RCX: 0000000000000000
RDX: ffff88006627c4c0 RSI: ffffffffa04c7a3c RDI: ffffffffa0ac872b
RBP: ffff88006638bae0 R08: fffffffffffffffe R09: 00000000fffffffe
R10: ffff88007d3323c0 R11: 0000000000000004 R12: ffff88006638bb08
R13: ffff880066328bc0 R14: ffffffffa04c7a2c R15: 0000000000000000
FS:  00007f86e7d33700(0000) GS:ffff880002200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000340 CR3: 000000005cd6a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process mdt00_002 (pid: 2597, threadinfo ffff88006638a000, task ffff88007bc21540)
Stack:
 fffffffffffffffe ffff8800663b0000 ffff880066389000 ffff88007d334980
<d> ffff880066389000 ffff880066389268 000000000000004d ffff88006638bc60
<d> ffff88006638bb10 ffffffffa0497f84 ffff88006638bb08 0000000000000008
Call Trace:
 [<ffffffffa0497f84>] dt_version_get+0x54/0x190 [obdclass]
 [<ffffffffa0b2aa3f>] mdt_obj_version_get+0x6f/0x1f0 [mdt]
 [<ffffffffa0b2b246>] mdt_version_get_save+0x76/0xd0 [mdt]
 [<ffffffffa0b30774>] mdt_reint_rename+0x2174/0x2200 [mdt]
 [<ffffffffa05d9770>] ? ldlm_blocking_ast+0x0/0x180 [ptlrpc]
 [<ffffffffa05dab10>] ? ldlm_completion_ast+0x0/0x730 [ptlrpc]
 [<ffffffffa062f886>] ? __req_capsule_get+0x176/0x750 [ptlrpc]
 [<ffffffffa0603646>] ? lustre_pack_reply_flags+0xb6/0x210 [ptlrpc]
 [<ffffffffa0b2a281>] mdt_reint_rec+0x41/0xe0 [mdt]
 [<ffffffffa0b23ada>] mdt_reint_internal+0x50a/0x810 [mdt]
 [<ffffffffa0b23e24>] mdt_reint+0x44/0xe0 [mdt]
 [<ffffffffa0b17932>] mdt_handle_common+0x922/0x1740 [mdt]
 [<ffffffffa0b18825>] mdt_regular_handle+0x15/0x20 [mdt]
 [<ffffffffa061382d>] ptlrpc_server_handle_request+0x40d/0xea0 [ptlrpc]
 [<ffffffffa031765e>] ? cfs_timer_arm+0xe/0x10 [libcfs]
 [<ffffffffa060acb7>] ? ptlrpc_wait_event+0xa7/0x2a0 [ptlrpc]
 [<ffffffff810533f3>] ? __wake_up+0x53/0x70
 [<ffffffffa0614e19>] ptlrpc_main+0xb59/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffffa06142c0>] ? ptlrpc_main+0x0/0x1860 [ptlrpc]
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: 33 4b 03 00 00 00 00 00 c7 05 21 4b 03 00 02 00 00 00 48 c7 c7 80 c7 ad a0 48 8b 48 40 48 8b 93 10 04 00 00 31 c0 e8 50 f8 87 ff <48> 8b 83 10 04 00 00 49 89 04 24 b8 08 00 00 00 48 8b 5d d8 4c 
RIP  [<ffffffffa0aa7c90>] osd_xattr_get+0x170/0x350 [osd_ldiskfs]
 RSP <ffff88006638baa0>

[root]# mkdir XXX
[root]# sys_path2fid XXX
[0x200000400:0x3:0x0]
[root]# sys_rename XXX .lustre/fid/[0x200000400:0x3:0x0]
[root]# sys_rename .lustre/fid/[0x200000400:0x3:0x0] XXX

[root]# sys_rename .lustre/fid .lustre/fid
[root]# sys_path2fid .lustre/fid
[0x200000002:0x2:0x0]
[root]# sys_rename .lustre/fid .lustre/fid/[0x200000002:0x2:0x0]
cannot rename `.lustre/fid' to `.lustre/fid/[0x200000002:0x2:0x0]': Invalid argument

[root]# sys_rename .lustre/fid/[0x200000002:0x2:0x0] .lustre/fid
cannot rename `.lustre/fid/[0x200000002:0x2:0x0]' to `.lustre/fid': Directory not empty

[root]# sys_rename .lustre/fid/[0x200000002:0x2:0x0]  .lustre/fid/[0x200000002:0x2:0x0]

[root]# sys_mknod .lustre/fid/PIPE f 0 0
cannot create device `.lustre/fid/PIPE' mode 10666, maj 0, min 0: Operation not permitted

[root]# sys_mknod .lustre/fid/PIPE r 0 0
cannot create device `.lustre/fid/PIPE' mode 100666, maj 0, min 0: Operation not permitted

[root]# sys_mknod .lustre/fid/PIPE d 0 0
invalid type `d'

[root]# sys_mknod .lustre/fid/PIPE c 0 0
cannot create device `.lustre/fid/PIPE' mode 20666, maj 0, min 0: Operation not permitted

[root]# sys_rename .lustre/fid .lustre
cannot rename `.lustre/fid' to `.lustre': Directory not empty
[root]# sys_getdents .lustre
d 144115188109410305 `.'
d            25003 `..'
[root]# sys_rename .lustre .lustre/fid
cannot rename `.lustre' to `.lustre/fid': Invalid argument

[root]# sys_path2fid .lustre
[0x61ac:0xbe3e3350:0x0]
[root]# sys_rename .lustre .lustre/fid/[0x61ac:0xbe3e3350:0x0]
cannot rename `.lustre' to `.lustre/fid/[0x61ac:0xbe3e3350:0x0]': Invalid argument
[root]# sys_rename .lustre/fid/[0x61ac:0xbe3e3350:0x0] .lustre/
cannot rename `.lustre/fid/[0x61ac:0xbe3e3350:0x0]' to `.lustre/': Directory not empty

[root]# sys_path2fid .
[0x61ab:0xbe3e334e:0x0]

[root]# sys_rename .lustre .lustre/fid/[0x61ac:0xbe3e3350:0x0]
cannot rename `.lustre' to `.lustre/fid/[0x61ac:0xbe3e3350:0x0]': Invalid argument

[root]# sys_rename .lustre/fid/[0x61ac:0xbe3e3350:0x0] .lustre/
cannot rename `.lustre/fid/[0x61ac:0xbe3e3350:0x0]' to `.lustre/': Directory not empty

[root]# sys_path2fid .
[0x61ab:0xbe3e334e:0x0]

[root]# sys_rename .lustre/ .lustre/fid/[0x61ab:0xbe3e334e:0x0]/.lustre

INFO: task sys_rename:3139 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sys_rename    D 0000000000000000     0  3139   1444 0x00000084
 ffff88005cd8fcf8 0000000000000086 ffff88005cd8fd08 ffffffff81189a05
 0000000000000000 ffffea000144f6b0 ffffffff8100bc0e ffff88005cd8fcf8
 ffff880062a79098 ffff88005cd8ffd8 000000000000fb88 ffff880062a79098
Call Trace:
 [<ffffffff81189a05>] ? __link_path_walk+0x155/0x1030
 [<ffffffff8100bc0e>] ? apic_timer_interrupt+0xe/0x20
 [<ffffffff8104f18b>] ? mutex_spin_on_owner+0x9b/0xc0
 [<ffffffff814ff2fe>] __mutex_lock_slowpath+0x13e/0x180
 [<ffffffff814ff19b>] mutex_lock+0x2b/0x50
 [<ffffffff811878e3>] lock_rename+0x73/0xe0
 [<ffffffff8118af83>] sys_renameat+0x113/0x260
 [<ffffffff8119a470>] ? mntput_no_expire+0x30/0x110
 [<ffffffff8117cb11>] ? __fput+0x1a1/0x210
 [<ffffffff81142c7e>] ? remove_vma+0x6e/0x90
 [<ffffffff810d6b12>] ? audit_syscall_entry+0x272/0x2a0
 [<ffffffff815036de>] ? do_page_fault+0x3e/0xa0
 [<ffffffff8118b0eb>] sys_rename+0x1b/0x20
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b

[sanity]$ sys_
sys_access     sys_creat      sys_listxattr  sys_mkdirat    sys_readlink   sys_symlink
sys_chdir      sys_getdents   sys_lma        sys_mknod      sys_rename     sys_truncate
sys_chmod      sys_lea        sys_lstat      sys_open       sys_rmdir      sys_unlink
sys_chown      sys_link       sys_mkdir      sys_path2fid   sys_stat