panic: assertion "elm->leaf.base.delete_tid != elm->leaf.base.create_tid" failed in hammer_delete_at_cursor at /usr/src/sys/vfs/hammer/hammer_object.c:2502
cpuid = 2
Trace beginning at frame 0xfffff8011803d118
hammer_delete_at_cursor() at hammer_delete_at_cursor+0x729 0xffffffff809443a9 
hammer_delete_at_cursor() at hammer_delete_at_cursor+0x729 0xffffffff809443a9 
hammer_ioc_mirror_write() at hammer_ioc_mirror_write+0x860 0xffffffff80940740 
hammer_ioctl() at hammer_ioctl+0xebe 0xffffffff8093ecce 
hammer_vop_ioctl() at hammer_vop_ioctl+0x48 0xffffffff80958978 
vop_ioctl() at vop_ioctl+0x63 0xffffffff8070a793 
Debugger("panic")

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)