234:panic: assertion "data_len >= 0 && data_len <= HAMMER_XBUFSIZE" failed in hammer_btree_extract at /usr/src/sys/vfs/hammer/hammer_btree.c:736
235-cpuid = 4
236-Trace beginning at frame 0xfffff8011903c208
237-hammer_btree_extract() at hammer_btree_extract+0x289 0xffffffff80929239 
238-hammer_btree_extract() at hammer_btree_extract+0x289 0xffffffff80929239 
239-hammer_ioc_dedup() at hammer_ioc_dedup+0x11b 0xffffffff8095c35b 
240-hammer_ioctl() at hammer_ioctl+0x12ae 0xffffffff8093f0be 
241-hammer_vop_ioctl() at hammer_vop_ioctl+0x48 0xffffffff80958978 
242-vop_ioctl() at vop_ioctl+0x63 0xffffffff8070a793 
243-Debugger("panic")
244-
245-CPU4 stopping CPUs: 0x0000002f
246- stopped
247-Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
248-db>