[Bug 7526] New: "exec /bin/sh" when ^C from an interactive shell script with "set -m"

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7526

           Summary: "exec /bin/sh" when ^C from an interactive shell
                    script with "set -m"
           Product: Busybox
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: Explorer09 at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


I cannot reproduce this bug in my Ubuntu host system, but it happens when I
test my initramfs image for this project
(https://github.com/Explorer09/cpustress-ubcd). So I have tried my best to
narrow down the problem and report here.

1. Download the attached initrd.xz
2. Boot it with a Linux kernel from a Linux distro. For example in GRUB:

  linux (hd0,msdos1)/boot/vmlinuz-3.13.0-36-generic quiet
  initrd (hd0,msdos1)/home/username/initrd.xz
  boot

3. This initrd.xz will start a "/runonce" script that calls "/test.sh" and you
will see this:

  + echo In /runonce
  In /runonce
  + /test.sh
  + echo In /test.sh
  In /test.sh
  + echo Press Ctrl+C now.
  Press Ctrl+C now.
  + read REPLY

4. Press Ctrl+C. Actual result:

  ^C+ exec /bin/sh
  (And it freezes here without any shell prompt.)

Expected result:

  ^C+ exec /bin/sh
  ~ # 

I also tested that, when I remove 'set -m' from the content of "test.sh",
things will work as expected.

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