i got this bug report from the "report a problem" link in the
notebook, i can confirm this on sagenb.org using 4.0
---
When running the following code, Sage 4.0 segfaults.
theta1,theta2=var('theta1,theta2')
g0=theta1
h0=g0.subs(theta1=1,theta2=0)
Various perturbations (such as not subbing for theta2, or calling the
variables t1,t2) seem to work fine. I assume the segfault is a
consequence of the pynac switch.
The error is
/data/shartke2/apps/sage-4.0/local/bin/sage-sage: line 198: 31008
Segmentation fault sage-ipython "$@" -i
I am running on Fedora 8 Linux x86_64, using gcc version 4.3.0
20080428 (Red Hat 4.3.0-8). The compilation of Sage 4.0 had no
errors; I can send the log file if that would be helpful. I did a
clean install of Sage 4.0, not an upgrade.
Thanks! Stephen
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