Christopher, done. badblocks test completes without errors on Ubuntu
12.04 (3.5.0-48).

My short test example:
badblocks -wsv -e 1 -t 255 /dev/mmcblk0 10000 4000

* read-only tests doesn't detect any issues;
* write-test pattern 0xff (-t 255) is much more efficient then first two 
default patterns (0xaa and 0x55);
* small random block range used (4000-10000) for quick tests.

Also, this card has been successfully tested on:
- RTS5139 Card Reader Controller (0bda:0139) (rtsx_usb on Lubuntu 16.04);
- ENE Technology Inc pci SD/MMC card reader controller (rtsx_usb on Xubuntu 
16.04);
- Nikon camera PTP USB device (gphoto2 on Ubuntu 16.04).

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https://bugs.launchpad.net/bugs/1579748

Title:
  rtsx_usb module for Realtek Semiconductor Corp. RTS5129 Card Reader
  Controller: mmc errors and read data corruption

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