Normally this is due to your loadbang triggering the cascade.
So every time you open the patch it causes the crash again.
The (one?) way to recover the file, which at this point is rendered inoperable, since every time you open it it causes the crash again, is to manually edit (with a text editor) the culprit .pd and replace all the [loadbang]s with "loadbang-b", "loadbang-dummy", or some other non-object name. Save it. Then reopen the file in PD.
When you reopen the patch, the connections will all still be there but the offending loadbang will show up as a non-object. And thus will not trigger the loadbang>cascade>stackoverflow. And therefore allow you to debug the infinite loop.
I hope this may help you.
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