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Description of problem:

This is the same bug than 

Bug 1449161 - crash in ssl3_GatherData

but for RHEL7 component. We have seen a customer where ns-slapd crashed with this stack trace:

"__memcpy_ssse3_back"
 "ssl3_GatherCompleteHandshake"
 "ssl_GatherRecord1stHandshake"
 "ssl_Do1stHandshake"
 "ssl_SecureRecv"
 "ssl_Recv"
 "connection_read_operation"
 "connection_threadmain"
 "_pt_root"
 "start_thread"
 "__clone"


Version-Release number of selected component (if applicable): 

nss-3.28.2-1.6.el7_3.x86_64

I could provide the core file if needed.