login: kern_rename: retry due to race on: "dst" -> "dst" (8,4)
nfs - retry rename src to dst
Fatal user address access from kernel mode from nfsd at ffffffff806478a1


Fatal trap 12: page fault while in kernel mode
cpuid = 2; lapic id = 2
fault virtual address	= 0xc8
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff806478a1
stack pointer	        = 0x10:0xfffff8011835eff0
frame pointer	        = 0x10:0xfffff8011835f020
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 0, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 839
current thread          = pri 10 
kernel: type 12 trap, code=0

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      lockmgr_release+0x11:   movq    0x8(%rdi),%rsi
db>