panic: no volume for offset 0x0040000000000000
cpuid = 4
Trace beginning at frame 0xfffff8011918ea98
hammer2_get_volume() at hammer2_get_volume+0x4b 0xffffffff8098726b 
hammer2_get_volume() at hammer2_get_volume+0x4b 0xffffffff8098726b 
_hammer2_io_getblk() at _hammer2_io_getblk+0x477 0xffffffff809650f7 
_hammer2_io_bread() at _hammer2_io_bread+0x17 0xffffffff80965397 
hammer2_chain_load_data() at hammer2_chain_load_data+0x2a5 0xffffffff8096f4a5 
hammer2_chain_lock() at hammer2_chain_lock+0xde 0xffffffff8096fa4e 
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>