BUG: memory leak
unreferenced object 0xffff8880165e9000 (size 256):
  comm "syz-executor.5", pid 7559, jiffies 4294945492
  hex dump (first 32 bytes):
    00 66 40 0a 80 88 ff ff 01 00 00 00 a2 01 12 05  .f@.............
    72 3a 63 67 72 6f 75 70 5f 74 3a 73 30 00 ad de  r:cgroup_t:s0...
  backtrace (crc ee30c3ee):
    [<00000000cb069143>] __kmalloc_node_noprof+0x36c/0x4a0
    [<0000000098297048>] __kvmalloc_node_noprof+0x178/0x200
    [<00000000c6406466>] want_pages_array+0x98/0xf0
    [<0000000009218c4d>] iov_iter_extract_pages+0x88f/0x1fa0
    [<00000000c69a3a40>] bio_map_user_iov+0x2ed/0xa50
    [<00000000b689e47b>] blk_rq_map_user_iov+0x618/0x1170
    [<000000007fc14dfd>] blk_rq_map_user_io+0x1d1/0x200
    [<00000000bf06126e>] sg_io+0x565/0xd80
    [<0000000073e66e65>] scsi_cdrom_send_packet+0x2a9/0x520
    [<000000008e72214d>] scsi_ioctl+0x131/0x15a0
    [<00000000bd858045>] sr_block_ioctl+0x213/0x260
    [<000000000bded348>] blkdev_ioctl+0x27e/0x6d0
    [<00000000dad556bc>] __x64_sys_ioctl+0x1a7/0x210
    [<00000000fb7ece26>] do_syscall_64+0xbf/0x1d0
    [<00000000facd577d>] entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: leak checking failed