x/x db_active
db_active:      1
db> x/4 db_active
db_active:      1
db> examine/4 db_active
db_active:      1               0x100000001addb %al,(%rax)
db_global_jmpbuf_valid+0x6:
db> print 0x41
      41
db> print/4 0x41

db> print/x 0x41
      41
db> write/4 db_active 1
Unknown size
db> write/l db_active 1
db_active               1 = 1
db> x/x db_active
db_active:      1
db> c

CPU0 restarting CPUs: 0x000000000000003e
 restarted