https://bugs.freedesktop.org/show_bug.cgi?id=108464
--- Comment #14 from Duncan Roe duncan_roe@optusnet.com.au --- Created attachment 143008 --> https://bugs.freedesktop.org/attachment.cgi?id=143008&action=edit dmesg o/p with attachment 143007
The exception occurs in dc_link_aux_transfer, which is called by dm_dp_aux_transfer which is the top displayed function on the stack after the BUG line in attachment 142063. There is no BUG entry with the patch, instead there is a line Cowardly refusing to call through null pointer after which the patch makes dc_link_aux_transfer return -1. Code somewhere up the stack attempts 2 retries.