Corrupted variables?

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   i've got misbehaving code. here's relevant excerpt:


b2[3]=0;
    serial.println(cmd);
  b2[4]=0;
    serial.println(cmd);

"cmd" changes 4 0 in above lines. thought might out of sram variable space, slashed resource requirements under 2k & i'm still getting same thing. what's going on?

cmd allocated on stack , b2 has replaced it.


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