Hmm.  My backtrace showed:

/home/mcneil/sagedev/sage-5.4.beta0/local/lib/libcsage.so(print_backtrace+0x3b)[0xb6bd7c49]
/home/mcneil/sagedev/sage-5.4.beta0/local/lib/libcsage.so(sigdie+0x17)[0xb6bd7c89]
/home/mcneil/sagedev/sage-5.4.beta0/local/lib/libcsage.so(sage_signal_handler+0x212)[0xb6bd778c]
[0xb772c400]
/home/mcneil/sagedev/sage-5.4.beta0/local/lib/libgmp.so.7(__gmpn_rshift+0x19c)[0xb6b897dc]

and my standard Python version of mpmath, which I don't think is
gmp-aware, produces

/usr/local/lib/python2.7/dist-packages/mpmath/libmp/libelefun.pyc in
exp_fixed(x, prec, ln2)
   1410         return v << n
   1411     else:
-> 1412         return v >> (-n)
   1413
   1414

OverflowError: long int too large to convert to int


Doug

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