Hi, Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> writes: > Hi, > > Jean-Jacques Hiblot <jjhiblot@xxxxxx> writes: >> Hi Felipe, >> >> While trying out the v4.9 kernel on a DRA7x, I stumbled upon this >> crash. I haven't tried to bisect yet and probably won't be do it >> before next year. >> >> This crash doesn't occur with a 4.4 kernel. I suspect it has to do >> with the changes in the TRB preparation and interrupt handling. >> >> I don't see the issue if qmult isn't increased. I suspect it's still >> there, just harder to reproduce. > > can't help you without tracepoints: > > # mkdir -p /t > # mount -t tracefs none /t > # cd /t > # echo 81920 > buffer_size_kb > # echo 1 > events/dwc3/enable > > (reproduce) > > # cp trace ~/trace.txt > > send me trace.txt, you probably need to compress it. nevermind, found it. I just pushed a branch called dwc3-fix-v4.9-NULL-pointer-deref to my k.org tree. Tested here and I can still see my 850 MBits/sec with MTU 1500. When setting MTU to 10000, then I got 1.15 Gbit/sec on iperf. Let me know your results. I'll send patches out after Xmas. -- balbi
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