panic: ffs_balloc: blk too big
cpuid = 0
Trace beginning at frame 0xfffff801184733f8
ffs_balloc() at ffs_balloc+0xfff 0xffffffff80906cff 
ffs_balloc() at ffs_balloc+0xfff 0xffffffff80906cff 
vop_balloc() at vop_balloc+0xaf 0xffffffff8070b94f 
ffs_write() at ffs_write+0x16a 0xffffffff809125aa 
vop_write() at vop_write+0x9d 0xffffffff8070a58d 
vn_write() at vn_write+0x134 0xffffffff80708b44 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>