--- Day changed Thu Nov 26 2015
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01:25 < gmaxwell> maybe interesting: my novena doing a arm asm test look segfaulted. I wonder if its reproducable.
01:27 < midnightmagic> :-/ that's disappointing.
01:27 < gmaxwell> well it had crashed before when I was testing with all the cores; actually managed to hit the cpu thermal shutdown on a hot day.
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02:12 < gmaxwell> uh oh! reproducable!
02:12 < gmaxwell> gmaxwell@novena-confide-uniform:~/secp256k1$ ./tests 1024 d61057e8f82a3d17eac35ce5161a88d4
02:12 < gmaxwell> test count = 1024
02:12 < gmaxwell> random seed = d61057e8f82a3d17eac35ce5161a88d4
02:12 < gmaxwell> Segmentation fault
02:12 < gmaxwell> 49454e69c15a1f1e578ff1fc583194b9c8b1e465 + ARM, = 40d0a9ae1df5afdb0ea8776f8c5de5dd65cd1f26
02:13 < sipa> where does it crash?
02:13 < gmaxwell> w/ gmp and endo.
02:13 < gmaxwell> dunno, running in gdb now. takes many minutes to crash.
02:14 < gmaxwell> (maybe 20? dunno exactly)
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04:15 < gmaxwell> 0_o
04:15 < gmaxwell> 0x000309f4 in damage_array (len=<synthetic pointer>, sig=0xbeffe810 "\002") at src/tests.c:3629
04:16 < gmaxwell> 3629            sig[secp256k1_rand_int(*len)] ^= 1 << secp256k1_rand_bits(3);
04:16 < gmaxwell> (gdb) p len
04:16  * gmaxwell looks for the integer underflow.
04:16 < gmaxwell> $1 = (size_t *) <synthetic pointer>
04:16 < gmaxwell> (gdb) p *len
04:16 < gmaxwell> $2 = 4294967295
04:18 < gmaxwell> the damage array loop can reduce the size and it's not rechecked. Now, the question is ... why haven't we seen this before?!
04:20 < sipa> ewww
04:22 < gmaxwell> probably should just deny the length reducing action if the size would go below 4 bytes
04:23 < sipa> well very small arrays are certainly interesting things to test...
04:23 < gmaxwell> Yes, exhaustively. :P
04:23 < sipa> point taken.
04:25 < gmaxwell> I'm still confused that we hadn't seen this before
04:25  * gmaxwell sleeos
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13:27 < andytoshi> sipa: haven't forgeotten about 302 or 322..
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