Want to crash PFGW?

carpetpool · 2016-11-30, 06:32

I've noticed an issue with PFGW's ABC and ABC2 files which will cause pfgw 3.8.1 to crash. For some reason, the expression (b^n-1)/(b-1) (with a fixed value of n) will cause pfgw to stop working if evaluated in a ABC or ABC2 sieve file. Thanks to anyone who has pfgw 3.8.1 and is willing to try this.

input.txt:

---------
ABC2 ($a^73-1)/($a-1)
a: from 1 to 10
---------

or an ABC file:

---------
ABC ($a^73-1)/($a-1)
1
2
3
4
5
6
7
8
9
10
---------

Note: (You may replace the 73 with any exponent, just using it as an example.)

and run with

pfgw64.exe input.txt

and pfgw 3.8.1 will stop working.

Batalov · 2016-11-30, 06:34

Dividing by zero is hard!

carpetpool · 2016-11-30, 06:36

Quote:

Originally Posted by Batalov

Dividing by zero is hard!

Good point. I didn't see that there.

2016-11-30, 06:32	#1
carpetpool "Sam" Nov 2016 2²×83 Posts	Want to crash PFGW? I've noticed an issue with PFGW's ABC and ABC2 files which will cause pfgw 3.8.1 to crash. For some reason, the expression (b^n-1)/(b-1) (with a fixed value of n) will cause pfgw to stop working if evaluated in a ABC or ABC2 sieve file. Thanks to anyone who has pfgw 3.8.1 and is willing to try this. input.txt: --------- ABC2 ($a^73-1)/($a-1) a: from 1 to 10 --------- or an ABC file: --------- ABC ($a^73-1)/($a-1) 1 2 3 4 5 6 7 8 9 10 --------- Note: (You may replace the 73 with any exponent, just using it as an example.) and run with pfgw64.exe input.txt and pfgw 3.8.1 will stop working.

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2016-11-30, 06:34	#2
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 11×19×47 Posts	Dividing by zero is hard!