> Is there a way to skip these kind of things ? 


Unfortunately no - this is the very root uri normalizer which seems to be the
issue, and I just can not reproduce the issue, even by calling the function
with the latest URL you gave
("/tat/persons.htm?search_persons=get&text%5Bsearch_string%5D=&submit_btn=%D0%98%D1%81%D0%BA%D0%B0%D1%82%D1%8C")
or by attempting to crawl a minimalistic file with this URI.

If you still have the gdb session opened, can also display in gdb:
print copyBuff
print qLen
print ampargs

I have been rechecking the code multiple times, and this issue is really
crazy.

Thanks for your valuable time again, I hope we'll catch this one!