msh and signals lost due to blocking

[Jate Sujjavanich]

I am using msh from busybox 1.7.2 and kernel 2.4.31-uc0 on m68knommu.
The shell handles SIGINT properly one to four times. After these
successes, the process group has signals blocked, and it the processes
never dequeue SIGINT. Restarting the shell resets the blocks. The cycle
repeats.

Does anyone familiar with msh know whether it activates signal blocking?
I am also not sure whether the something in the library does this.
Thanks.

- Jate S.