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Oracle Linux: WARNING: At Fs/dcache.c:2558 Prepend_path+0x16e/0x190() (Doc ID 2059587.1)

Last updated on AUGUST 04, 2018

Applies to:

Linux OS - Version Oracle Linux 5.1 and later
Information in this document applies to any platform.

Symptoms

On Oracle Linux 5.9 System running with kernel 2.6.39-400.209.1.el5uek has below messages logging frequently.

-- Log --

 

Sep  6 22:43:56 xxxxxxxxxx kernel: ------------[ cut here ]------------

Sep  6 22:43:56 xxxxxxxxxx kernel: WARNING: at fs/dcache.c:2558 prepend_path+0x16e/0x190()

Sep  6 22:43:56 xxxxxxxxxx kernel: Root dentry has weird name <>

Sep  6 22:43:56 xxxxxxxxxx kernel: Modules linked in: autofs4 i2c_dev i2c_core hidp nfs fscache auth_rpcgss nfs_acl rfcomm

bluetooth rfkill ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs lockd sunrpc be2iscs

i iscsi_boot_sysfs ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic uio ipv6 cxgb3i libcxg

bi cxgb3 mdio libiscsi_tcp libiscsi scsi_transport_iscsi dm_mirror parport_pc lp parport snd_seq_dummy snd_seq_oss snd_

seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc xen_netf

ront pcspkr dm_region_hash dm_log dm_mod xen_blkfront ext3 jbd mbcache

Sep  6 22:43:56 xxxxxxxxxx kernel: Pid: 1638, comm: lsof Tainted: G        W   2.6.39-400.209.1.el5uek #1

Sep  6 22:43:56 xxxxxxxxxx kernel: Call Trace:

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff81180a8e>] ? prepend_path+0x16e/0x190

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff8106f0b0>] warn_slowpath_common+0x90/0xc0

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff8106f1de>] warn_slowpath_fmt+0x6e/0x70

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811805d2>] ? prepend+0x32/0x40

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811805d2>] ? prepend+0x32/0x40

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff81180a8e>] prepend_path+0x16e/0x190

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff81180b31>] path_with_deleted+0x81/0xa0

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff81182b4b>] d_path+0xbb/0xf0

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811c9900>] do_proc_readlink+0x70/0xc0

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811cb738>] proc_pid_readlink+0x78/0x90

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811701b2>] sys_readlinkat+0xc2/0xd0

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff811701db>] sys_readlink+0x1b/0x20

Sep  6 22:43:56 xxxxxxxxxx kernel:  [<ffffffff8150fcc2>] system_call_fastpath+0x16/0x1b

Sep  6 22:43:56 xxxxxxxxxx kernel: ---[ end trace 31a2a18f77104d9d ]---

Sep  6 22:43:56 xxxxxxxxxx kernel: ------------[ cut here ]------------

Sep  6 22:43:56 xxxxxxxxxx kernel: WARNING: at fs/dcache.c:2558 prepend_path+0x16e/0x190()

-----------------8<---------------------------


 

Changes

New NFS shares added to the host.

--- mounts ---
...
/dev/xvdb1 on /oracle type ext3 (rw) [/oracle]
/dev/xvdb2 on /apps type ext3 (rw) [/apps]
veles:/vol/ora_dev1_temp/OBIDEV_temp1 on /oracle/OBIDEV/oratemp1 type nfs (rw,bg,hard,nfsvers=3,proto=tcp,timeo=600,rsize=65536,wsize=65536,nointr,addr=10.x.x.x)
perun:/vol/ora_dev2_bina/OBIINT_binaries on /oracle/OBIINT/product type nfs (rw,bg,hard,nfsvers=3,proto=tcp,timeo=600,rsize=65536,wsize=65536,nointr,addr=10.x.x.x)
perun:/vol/ora_dev2_data/OBIINT_data1 on /oracle/OBIINT/oradata1 type nfs (rw,bg,hard,nfsvers=3,proto=tcp,timeo=600,rsize=65536,wsize=65536,nointr,addr=10.x.x.x)
perun:/vol/ora_dev2_temp/OBIINT_temp1 on /oracle/OBIINT/oratemp1 type nfs (rw,bg,hard,nfsvers=3,proto=tcp,timeo=600,rsize=65536,wsize=65536,nointr,addr=10.x.x.x)
...

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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