gdb ./pi-c-quartic
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(gdb) run
Starting program: /home/sdyer/python/pi/./pi-c-quartic
Set default precision
Initialized variables
Initial values set.
Starting iteration 1
Finished yn^4
Finished square roots
Finished 1-t1
Finished 1+t1

Program received signal SIGSEGV, Segmentation fault.
mpn_dc_div_3_halves_by_2 (qp=0xbfc9042c, np=0xbfa39f18, dp=0xbfda94b0, n=9282) at dc_divrem_n.c:120
120       mpn_mul_n (tmp, qp, dp, n);
(gdb) where
#0  mpn_dc_div_3_halves_by_2 (qp=0xbfc9042c, np=0xbfa39f18, dp=0xbfda94b0, n=9282) at dc_divrem_n.c:120
#1  0x805096f in __gmpn_dc_divrem_n (qp=0x5d7ed655, np=0xc277487a, dp=0xe54f9b52, n=-1327988966) at dc_divrem_n.c:95
#2  0x2efe0b21 in ?? ()
Cannot access memory at address 0xb7f61b62
(gdb)