Segmentation fault when using asyncsafe on program / with gdb

~~~
> LD_PRELOAD=./libasyncsafe.so cobcrun PROG
Segmentation fault

> LD_PRELOAD=./libasyncsafe.so gdb --args cobcrun -version
asyncsafe violation! handler for signal 17 called [__errno_location]
Segmentation fault
~~~

Any ideas?

Note: the signal handling is _not_ done in the main executable cobcrun but in its shared library.