BUG: memory leak
unreferenced object 0xffff888008ebfe00 (size 256):
  comm "syz-executor.1", pid 14141, jiffies 4297873583 (age 27.664s)
  hex dump (first 32 bytes):
    00 45 b2 43 80 88 ff ff 8e 36 00 00 c8 01 3d 04  .E.C.....6....=.
    c0 64 51 00 00 ea ff ff 00 10 00 00 00 00 00 00  .dQ.............
  backtrace:
    [<00000000c684dc3d>] __kmalloc_node+0x4d/0x160
    [<00000000cf893163>] kvmalloc_node+0xaa/0x200
    [<00000000da88aef0>] iov_iter_extract_pages+0x353/0x1950
    [<000000000087c7b4>] bio_map_user_iov+0x2f7/0xea0
    [<00000000a63157ab>] blk_rq_map_user_iov+0x68d/0x16c0
    [<00000000f549beff>] blk_rq_map_user_io+0x1d1/0x200
    [<0000000045e84726>] sg_io+0x564/0xd80
    [<000000009ca55d02>] scsi_cdrom_send_packet+0x2a9/0x510
    [<000000005496939e>] scsi_ioctl+0x135/0x15d0
    [<000000000a3857a3>] sr_block_ioctl+0x1f8/0x240
    [<000000004b441c32>] blkdev_ioctl+0x35e/0x7f0
    [<00000000e9e62cb7>] __x64_sys_ioctl+0x19e/0x210
    [<00000000bbb14b19>] do_syscall_64+0x3f/0x90
    [<00000000099e2aa6>] entry_SYSCALL_64_after_hwframe+0x72/0xdc

BUG: leak checking failed