Hi, I am also getting similar traces on boot, not every time. The following is from a fresh net install on a ProLiant DL380 G7.

Oct 13 11:54:36 node21 kernel: [    3.347415] [drm] radeon kernel modesetting enabled.
Oct 13 11:54:36 node21 kernel: [    3.347490] checking generic (e8000000 130000) vs hw (e8000000 8000000)
Oct 13 11:54:36 node21 kernel: [    3.347491] fb: conflicting fb hw usage radeondrmfb vs VESA VGA - removing generic driver
Oct 13 11:54:36 node21 kernel: [    3.349507] Console: switching to colour dummy device 80x25
Oct 13 11:54:36 node21 kernel: [    3.349524] BUG: unable to handle kernel NULL pointer dereference at 0000000000000138
Oct 13 11:54:36 node21 kernel: [    3.349528] IP: [<ffffffff8145d382>] con_set_unimap+0x32/0x290
Oct 13 11:54:36 node21 kernel: [    3.349531] PGD bdbef4067 PUD bdada8067 PMD 0 
Oct 13 11:54:36 node21 kernel: [    3.349532] Oops: 0000 [#1] SMP 
Oct 13 11:54:36 node21 kernel: [    3.349548] Modules linked in: intel_powerclamp radeon(+) coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul gpio_ich ghash_clmulni_intel ttm aesni_intel drm_kms_helper aes_x86_64 drm lrw gf128mul glue_helper ablk_helper i2c_algo_bit cryptd hpilo hpwdt i7core_edac joydev edac_core lpc_ich ipmi_si serio_raw mac_hid acpi_power_meter lp parport hid_generic usbhid hid psmouse bnx2 hpsa
Oct 13 11:54:36 node21 kernel: [    3.349551] CPU: 22 PID: 700 Comm: setfont Tainted: G          I   3.13.0-37-generic #64-Ubuntu
Oct 13 11:54:36 node21 kernel: [    3.349552] Hardware name: HP ProLiant DL380 G7, BIOS P67 05/05/2011
Oct 13 11:54:36 node21 kernel: [    3.349553] task: ffff8817da688000 ti: ffff880bd5d60000 task.ti: ffff880bd5d60000
Oct 13 11:54:36 node21 kernel: [    3.349556] RIP: 0010:[<ffffffff8145d382>]  [<ffffffff8145d382>] con_set_unimap+0x32/0x290
Oct 13 11:54:36 node21 kernel: [    3.349557] RSP: 0018:ffff880bd5d61d48  EFLAGS: 00010246
Oct 13 11:54:36 node21 kernel: [    3.349558] RAX: ffff880bdadd0b08 RBX: 0000000001c0bb10 RCX: 00000000c0000100
Oct 13 11:54:36 node21 kernel: [    3.349558] RDX: 0000000000001530 RSI: 0000000000000296 RDI: 0000000000000296
Oct 13 11:54:36 node21 kernel: [    3.349559] RBP: ffff880bd5d61db0 R08: ffff880bd5d60000 R09: 000000000000001c
Oct 13 11:54:36 node21 kernel: [    3.349561] R10: 0000000000000054 R11: 000000000000004c R12: 0000000000000000
Oct 13 11:54:36 node21 kernel: [    3.349562] R13: 0000000000004b67 R14: ffff880bdadd0800 R15: ffff880bdadd0800
Oct 13 11:54:36 node21 kernel: [    3.349563] FS:  00007f81dbf6c740(0000) GS:ffff880befd60000(0000) knlGS:0000000000000000
Oct 13 11:54:36 node21 kernel: [    3.349564] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Oct 13 11:54:36 node21 kernel: [    3.349565] CR2: 0000000000000138 CR3: 0000000bd5c8e000 CR4: 00000000000007e0
Oct 13 11:54:36 node21 kernel: [    3.349566] Stack:
Oct 13 11:54:36 node21 kernel: [    3.349571]  ffff880bd5d61d78 ffffffff8131226d ffff8817da688000 0000000000000002
Oct 13 11:54:36 node21 kernel: [    3.349575]  0000000000004b67 ffff880bdadd0800 000002e1d5d61d88 ffff880bdadd0800
Oct 13 11:54:36 node21 kernel: [    3.349577]  0000000000000000 0000000000000002 0000000000004b67 ffff880bdadd0800
Oct 13 11:54:36 node21 kernel: [    3.349577] Call Trace:
Oct 13 11:54:36 node21 kernel: [    3.349583]  [<ffffffff8131226d>] ? apparmor_capable+0x1d/0x130
Oct 13 11:54:36 node21 kernel: [    3.349587]  [<ffffffff81457223>] vt_ioctl+0xe83/0x11c0
Oct 13 11:54:36 node21 kernel: [    3.349590]  [<ffffffff8144ad3d>] tty_ioctl+0x26d/0xbb0
Oct 13 11:54:36 node21 kernel: [    3.349594]  [<ffffffff811d03a0>] do_vfs_ioctl+0x2e0/0x4c0
Oct 13 11:54:36 node21 kernel: [    3.349597]  [<ffffffff8117fa07>] ? do_munmap+0x297/0x3b0
Oct 13 11:54:36 node21 kernel: [    3.349599]  [<ffffffff811d0601>] SyS_ioctl+0x81/0xa0
Oct 13 11:54:36 node21 kernel: [    3.349602]  [<ffffffff8172f82d>] system_call_fastpath+0x1a/0x1f
Oct 13 11:54:36 node21 kernel: [    3.349614] Code: 89 e5 41 57 49 89 ff 41 56 41 55 41 54 53 48 89 d3 48 83 ec 40 48 89 7d d0 89 75 cc e8 a8 e4 c5 ff 49 8b 87 10 03 00 00 4c 8b 20 <41> 8b 84 24 38 01 00 00 85 c0 0f 85 38 02 00 00 66 83 7d cc 00 
Oct 13 11:54:36 node21 kernel: [    3.349616] RIP  [<ffffffff8145d382>] con_set_unimap+0x32/0x290
Oct 13 11:54:36 node21 kernel: [    3.349616]  RSP <ffff880bd5d61d48>
Oct 13 11:54:36 node21 kernel: [    3.349617] CR2: 0000000000000138
Oct 13 11:54:36 node21 kernel: [    3.349618] ---[ end trace f62d7fc492f713e6 ]---