Hello linux-rmda, I recently upgraded one of my boxes to 4.13, and have started experiencing issues with ib_mthca. To start, my setup is Infiniband direct between 2 servers using older Mellanox Technologies MT25208 cards for ipoib as well as NFS over RDMA. After upgrading, the following has been experienced: 1. On my NAS host running OpenSM, as soon as it starts I get a NULL pointer dereference which makes infiniband unusable. [0] This only occurs on kernel 4.13 or newer. 2. On my compute host not running OpenSM, connectivity works for a bit but shortly after dmesg is full of the following message: infiniband mthca0: ib_post_send_mad error This occurs when my compute host is on kernel 4.13 or newer. I went ahead and tested some mainline kernel versions on both of my nodes, and here are my findings: 4.13.8 = NULL pointer dereference on NAS, IPoIB not working 4.12.14 = Works as expected 4.14.0-rc5 = NULL pointer dereference on NAS, IPoIB not working I have tried to see if I could find the patch responsible for this, but sadly I have not had much luck. As for my systems, the following modules are loaded: ib_uverbs ib_umad rdma_ucm ib_mthca ib_ipoib Let me know if there is anything I can test to help diagnose what is causing this issue. Regards, Chris Blake [0]: https://gist.github.com/riptidewave93/48595b8bc3bca669251db7d8a8e8a803 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
