At work, I have to develop an embedded system sh3 with busybox and 2.6.12.6 kernel inside it. It is connected to gsm modem through ttySC1. After shutting down several times and rebooting, the pppd occasionally got segmentation fault. The suggestion from debian bug report solves my problem. It is pretty straightforward: Simply delete /var/run/pppd.tdb file (in my system, it is /var/run/pppd2.tdb).
That's all :)
Worked for me. Many thanks.
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