[SciPy-user] leastsq w/ Jocobian seg fault

[Lin Shao]

Hi, I think there's a bug in leastsq when Jacobian is involved -- the
full_output option has to be 1 if Dfun is assigned to a user-defined
function, otherwise there's a segmentation fault. gdb shows the seg
fault happens here:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1210287456 (LWP 17643)]
0xb7e2c01a in malloc_usable_size () from /lib/tls/libc.so.6

If I force not to use the thread-local libc, I still got a seg fault:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 17610)]
0xb7e7f1aa in __libc_malloc_pthread_startup () from /lib/libc.so.6

This problem doesn't happen if Jocobian (Dfun) is None. It also
doesn't happen when running on Debian x86_64 version.

I'm using scipy 0.5.3, Debian i686 2.6.18 kernel. Thanks!

--lin