Comment 27 for bug 1861235

I picked the last dataset given in the command output from an earlier, but not the most recent, comment:

$ sudo zdb -dddd srv/backups/millbarge/rpool/var/log 529
Dataset srv/backups/millbarge/rpool/var/log [ZPL], ID 39694, cr_txg 23197757, 554M, 274 objects, rootbp DVA[0]=<1:1d000d42000:1000> DVA[1]=<2:24416f4b000:1000> [L0 DMU objset] sha256 uncompressed LE contiguous unique double size=800L/800P birth=23437543L/23437543P fill=274 cksum=cf5fcb2f986c768c:7cc8638aeb1a5162:9de9f236f072e16:40c6a08d90b54951

    Object lvl iblk dblk dsize dnsize lsize %full type
       529 0 0 0 0 512 0 -nan DSL permissions (K=UNKNOWN) (Z=UNKNOWN)
                                                 0 bonus UNKNOWN
 dnode flags: USED_BYTES USERUSED_ACCOUNTED USEROBJUSED_ACCOUNTED SPILL_BLKPTR
 dnode maxblkid: 0
 UNKNOWN OBJECT TYPE
c < (1ULL << 24) >> 9 (0x7fffffffffffff < 0x8000)
ASSERT at ../../module/zfs/zio.c:266:zio_buf_alloc()Aborted

Thanks