login: panic: kern_ftruncate(): VOP_GETATTR didn't return 0
cpuid = 0
Trace beginning at frame 0xfffff800ab79f798
kern_ftruncate() at kern_ftruncate+0x152 0xffffffff80705532 
kern_ftruncate() at kern_ftruncate+0x152 0xffffffff80705532 
sys_xsyscall() at sys_xsyscall+0x89 0xffffffff80bd6749 
syscall2() at syscall2+0x11e 0xffffffff80bd611e 
Debugger("panic")

CPU0 stopping CPUs: 0x00000002
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbd77f9(%rip)
db>