[Bug 1484891] Re: grub2 death when enter linux command twice

[dupingping]

I checked this bug.

** Changed in: grub2 (Ubuntu)
       Status: New => Confirmed

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Title:
  grub2 death when enter linux command twice

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 14.04.3 LTS
  Release:	14.04

  grub2:
    Installed: (none)
    Candidate: 2.02~beta2-9ubuntu1.3
    Version table:
       2.02~beta2-9ubuntu1.3 0
          500 http://mirrors.yun-idc.com/ubuntu/ trusty-updates/universe amd64 Packages
       2.02~beta2-9 0
          500 http://mirrors.yun-idc.com/ubuntu/ trusty/universe amd64 Packages

  
  I think that the grub2 needs to work for many grub shell commands.
  But critical error is occurred as follow.

  Bug scenario is as following.

  - at the grub menu, press C key.
  - enter "linux /vmlinuz" command to "grub>" shell
  - enter above command once more.
  - grub2 does not response.

  I traced the code lines.
  So the grub2 is entered and never ended a loop at the grub_core/lib/relocator.c, free_subchunk function.
  And I could not skip this loop, because if i skip this loop, the /proc/cmdline is broken.

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