Hi Konstantin, > Unfortunately, I don't have a possibility to test 5.5 kernel. As far as > I can see, the most recent version available to the public via > git.kernel.org is 5.3-rc3 and the problematic part in > /net/bluetooth/l2cap_core.c file is the same for 4.20 and 5.3-rc3. > Hence I suppose it will behave the same way as 4.20. can you include the btmon trace for the PTS test case so that I see what PTS sends and what we are responding. Regards Marcel