> It is a dual Pentium III running a vanilla linux 2.2.16.

fails for me on 2.4.0-test5/pre4, as expected (segv).
I presume that's because this fairly normal RH config
comes with 8M stack limit.  if I unlimit the stack,
the program appears to perform as designed, namely,
your basic forkbomb-like abuse of a slightly different color.

> Bye and thanks in advance for any hint, (--> is there a patch?)

using a modern kernel.  or stop hitting your head against the wall.

> PPS: Then man page of alloca tells me, that alloca should return 0
>      on error. Try to find that comparison in the assembler
>      output of the above mentioned testcase.

Linux doesn't commit VM on allocation.  this is usually The Right Thing.

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