If you have huge trace file with the following trace
 kgnfs_flushmsg:4808: CH OUT of ORDER SEND m->order 197816641 ch->order -1 ch 0xa0d530640
 kgnfs_flushmsg:4808: CH OUT of ORDER SEND m->order 197816642 ch->order -1 ch 0xa0d530640
Seems like you are hitting below bug:
Bug 16542886 - HUGE TRACE FILES WITH DNFS ERROR MESSAGES
Critical Patch Update for October 2018 Now Available - The Critical Patch Update (CPU) for October 2018 was released on 16 October 2018. Oracle strongly recommends applying the patches as soon as possible. The ...
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