Build full ota package: /home/rino/a/patchrom/st27i/stockrom.zip
unzipping target target-files...
using device-specific extensions in .
unable to load device-specific module; assuming none
Traceback (most recent call last):
  File "/home/rino/a/patchrom/tools/releasetools/ota_from_target_files", line 888, in <module>
    main(sys.argv[1:])
  File "/home/rino/a/patchrom/tools/releasetools/ota_from_target_files", line 856, in main
    WriteFullOTAPackage(input_zip, output_zip)
  File "/home/rino/a/patchrom/tools/releasetools/ota_from_target_files", line 409, in WriteFullOTAPackage
    script.FormatPartition("/system")
  File "/home/rino/a/patchrom/tools/releasetools/edify_generator.py", line 170, in FormatPartition
    p = fstab[partition]
KeyError: '/system'
umount: can't umount /system: Device or resource busy