Chuck Lever writes via Kernel.org Bugzilla: Hi Chen - After some review, these all appear to be Red Hat Enterprise kernels. Such kernels are extensively patched and maintained exclusively by Red Hat engineers. I kindly request that you report this issue to Red Hat first and have them troubleshoot it. If they find there is a needed upstream fix, do feel free to re-open this bug. [I am a fan of the old ConnectX-3 cards, btw] View: https://bugzilla.kernel.org/show_bug.cgi?id=219535#c9 You can reply to this message to join the discussion. -- Deet-doot-dot, I am a bot. Kernel.org Bugzilla (bugspray 0.1-dev)