Why does a kernel panic occur when OpenCL™ Applications are executed on Intel® FPGA Development Kits with IOMMU support enabled? - Why does a kernel panic occur when OpenCL™ Applications are executed on Intel® FPGA Development Kits with IOMMU support enabled? Description When executing OpenCL™ host applications on an attached development kit while IOMMU (e.g. intel_iommu) is enabled in a Linux Kernel, a kernel panic may occur and cause the host to hang. This may happen even if 'aocl diagnose' and 'aocl program' pass. The hang occurs because the OpenCL™ board support packages (BSPs) for the development kits don't support SR-IOV. Resolution To work around this problem, disable IOMMU functionality : For example on CentOS7.4, with grub2, UEFI and intel_iommu : 1. Edit / etc/default/grub and delete the following line. intel_iommu=on in GRUB_CMDLINE_LINUX 2. Update grub configuration file grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg 3. Reboot 4. Check /proc/cmdline Ensure intel_iommu=on does not appear on the kernel command line. This workaround does not apply to the Intel FPGA Programmable Acceleration Card (PAC) since that OpenCL™ BSP does support SR-IOV. If IOMMU is disabled when using the PAC, refer to the Intel® Acceleration Stack Quick Start Guide for instructions to enable the Intel IOMMU driver. Custom Fields values: ['novalue'] Troubleshooting 1507064457 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 17.1.1 ['Arria® 10 GX FPGA', 'Stratix® 10 GX FPGA', 'Stratix® V GX FPGA'] ['HLD Tools OpenCL'] ['novalue'] ['novalue']