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Date:      Mon, 9 Jun 2003 19:29:19 +0200
From:      Wiktor Niesiobedzki <w@evip.pl>
To:        current@freebsd.org
Subject:   Stack and alloca(3)
Message-ID:  <20030609172919.GE48387@mail.evip.pl>

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Hi hackers,

After todays (Mon Jun  9 09:32:45) buildworld, ppp(8) stoped to service my
PPPoE connection. After investigation I found, that the problem lies in lines
519-630 of ether.c.

The problem is, that after memory is allocated with alloca(3), whatever is
sprintf-ed to that frame, is lost. As a quick hack I changed the alloca with
malloc(3) and ppp started to work correctly (I know, it is very nasty hack).

I failed to tigger the bug in any of my test programs. 

Anyone is willing to help me to find the root cause of this bug?

Note: world builded on 6 Jun was working correctly, so it is something in
rather short timeframe.

Cheers,

Wiktor Niesiobedzki



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