Sep 26 20:22:34 kafka kernel: ------------[ cut here ]------------
Sep 26 20:22:34 kafka kernel: Your BIOS is broken; DMAR reported at address 0!
                              BIOS vendor: American Megatrends Inc.; Ver: 1.03.06RS761; Product Version: gazp9b                          
Sep 26 20:22:34 kafka kernel: WARNING: CPU: 0 PID: 0 at /build/linux-SlLHxe/linux-4.15.0/drivers/iommu/dmar.c:848 warn_invalid_dmar.part.11+0x5c/0x70
Sep 26 20:22:34 kafka kernel: Modules linked in:
Sep 26 20:22:34 kafka kernel: CPU: 0 PID: 0 Comm: swapper Not tainted 4.15.0-34-generic #37-Ubuntu
Sep 26 20:22:34 kafka kernel: Hardware name: System76, Inc.                   Gazelle Professional            /Gazelle Professional           , BIOS 1.03.06RS761 07/28/2014
Sep 26 20:22:34 kafka kernel: RIP: 0010:warn_invalid_dmar.part.11+0x5c/0x70
Sep 26 20:22:34 kafka kernel: RSP: 0000:ffffffff9ea03da0 EFLAGS: 00010086
Sep 26 20:22:34 kafka kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff9ea626e8
Sep 26 20:22:34 kafka kernel: RDX: 0000000000000001 RSI: 0000000000000082 RDI: 0000000000000047
Sep 26 20:22:34 kafka kernel: RBP: ffffffff9ea03dc0 R08: 0000000000000001 R09: 00000000000000b2
Sep 26 20:22:34 kafka kernel: R10: ffffffff9ea03c98 R11: 0000000000000000 R12: ffffffff9e70e826
Sep 26 20:22:34 kafka kernel: R13: ffffffff9f13e01c R14: ffffffff9f13e080 R15: ffffffffff200f40
Sep 26 20:22:34 kafka kernel: FS:  0000000000000000(0000) GS:ffff9c239fa00000(0000) knlGS:0000000000000000
Sep 26 20:22:34 kafka kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 26 20:22:34 kafka kernel: CR2: ffff9c239fdff000 CR3: 000000001120a001 CR4: 00000000000606b0
Sep 26 20:22:34 kafka kernel: Call Trace:
Sep 26 20:22:34 kafka kernel:  dmar_validate_one_drhd+0xab/0xe0
Sep 26 20:22:34 kafka kernel:  dmar_walk_remapping_entries+0xa6/0x1d0
Sep 26 20:22:34 kafka kernel:  detect_intel_iommu+0x66/0xef
Sep 26 20:22:34 kafka kernel:  ? xen_swiotlb_init+0x4e0/0x4e0
Sep 26 20:22:34 kafka kernel:  pci_iommu_alloc+0x55/0x71
Sep 26 20:22:34 kafka kernel:  mem_init+0x1c/0xa9
Sep 26 20:22:34 kafka kernel:  start_kernel+0x2ce/0x4fd
Sep 26 20:22:34 kafka kernel:  x86_64_start_reservations+0x24/0x26
Sep 26 20:22:34 kafka kernel:  x86_64_start_kernel+0x74/0x77
Sep 26 20:22:34 kafka kernel:  secondary_startup_64+0xa5/0xb0
Sep 26 20:22:34 kafka kernel: Code: 88 1c 00 bf 01 00 00 00 49 89 c5 e8 1f 88 1c 00 4d 89 f1 4d 89 e8 48 89 c1 4c 89 e2 48 89 de 48 c7 c7 40 bc 74 9e e8 d4 53 a5 ff <0f> 0b 5b 41 5c 41 5d 41 5e 5d c3 66 0f 1f 84 00 00 00 00 00 e8 
Sep 26 20:22:34 kafka kernel: ---[ end trace 35cab07da1e66851 ]---