Why log messages shows WARNING: at fs/dcache.c:1481 d_set_d_op+0x8d/0xc0()?

Issue

• Why log messages shows WARNING: at fs/dcache.c:1481 d_set_d_op+0x8d/0xc0()?

# grep dcache sos_commands/logs/journalctl_--all_--this-boot_--no-pager
Aug 20 19:58:11 msatlnxvm27 kernel: WARNING: at fs/dcache.c:1481 d_set_d_op+0x8d/0xc0()
Aug 20 19:58:11 msatlnxvm27 kernel: WARNING: at fs/dcache.c:1486 d_set_d_op+0xb0/0xc0()
...
...
Call Trace:
 [<ffffffff81603f26>] dump_stack+0x19/0x1b
 [<ffffffff8106e28b>] warn_slowpath_common+0x6b/0xb0
 [<ffffffff8106e3da>] warn_slowpath_null+0x1a/0x20
 [<ffffffff811dc3fd>] d_set_d_op+0x8d/0xc0
 [<ffffffffa03cc322>] vnode_iop_lookup+0x44b/0x49d [mvfs]    <<<===----
 [<ffffffff811df2e2>] ? __d_alloc+0x122/0x180
 [<ffffffff811d048d>] lookup_real+0x1d/0x50
 [<ffffffff811d0dd2>] __lookup_hash+0x42/0x60
 [<ffffffff81601262>] lookup_slow+0x42/0xa7
 [<ffffffff811d4ef3>] path_lookupat+0x773/0x7a0
 [<ffffffff81209f07>] ? fsnotify_clear_marks_by_inode+0xa7/0x140
 [<ffffffff811ab505>] ? kmem_cache_alloc+0x35/0x1d0
 [<ffffffff811d6aaf>] ? getname_flags+0x4f/0x190
 [<ffffffff811d4f4b>] filename_lookup+0x2b/0xc0
 [<ffffffff811d7927>] user_path_at_empty+0x67/0xc0
 [<ffffffff811dc46f>] ? __d_free+0x3f/0x60
 [<ffffffff811dc8d5>] ? d_free+0x55/0x60
 [<ffffffff811dcfae>] ? dentry_kill+0x14e/0x1b0
 [<ffffffff811d7991>] user_path_at+0x11/0x20
 [<ffffffff811cb483>] vfs_fstatat+0x63/0xc0
 [<ffffffff811c8243>] ? __fput+0x183/0x270
 [<ffffffff811cb9ee>] SYSC_newstat+0x2e/0x60
 [<ffffffff811c846e>] ? ____fput+0xe/0x10
 [<ffffffff81093b2c>] ? task_work_run+0xac/0xe0
 [<ffffffff81013af4>] ? do_notify_resume+0x84/0xb0
 [<ffffffff8161405d>] ? int_signal+0x12/0x17
 [<ffffffff811cbcce>] SyS_newstat+0xe/0x10
 [<ffffffff81613da9>] system_call_fastpath+0x16/0x1b