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I've been having strange halt issues with my box recently. Most of the times the system just hangs, there is zero input in the logs, vga output is dead. Now, I catched the following report from the screen. Any ideas what might be the problem? Thanks!

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Damian GNU/Linux 8 hcat tty1
hcat login:
[246351.450221] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[246351.450336] IP: [<ffffffff8140287f>] rb_next+0x6/0x41
[246351.450412] PGD 474a3000
[246351.4S0451] Oops: 0000 [#1] SMP
[246351.450504] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 3.14.44-grsec #1
[246351.4S0589] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900M, BIOS P1.20 03/25/2014
[246351.4S0708] task: ffff88006cfec010 ti: ffff88006cfec318 task.ti: ffff88006cfec318
[246351.450802] RIP: 0010:[<ffffffff8140287f>]  [<ffffffff8140287f>] rb_next+0x6/0x41
[246351.450902] RSP: 0000:ffffc90000343dc0  EFLAGS: 00010046
[246351.450971] RAX: 0000000000000000 RBX: 0000000000000010 RCX: fffffffffffffff0
[246351.451061] RDX: 0000000000000000 RSI: ffff88006cfec010 RDI: 0000000000000010
[246351.451151] RBP: ffff88006d20f3b0 R08: 0000000000000200 R09: ffff88006a93ddd8
[246351.4S1241] R10: ffff880069b0e090 R11: 000000000000005e R12: ffff88006d20f340
[246351.451331] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88006cfec010
[246351.451422] FS:  0000000000000000(0000) GS:ffff88006d200000(0000) kn1GS:0000000000000000
[246351.451524] CS:  0010 DS: 0000 ES: 0000 CRO: 000000008005003b
[246351.451598] CR2: 0000000000000010 CR3: 0000000001af6000 CR4: 00000000001007f0
[246351.4S1687] Stack:
[246351.451715] 0000000000000000 ffffffff810a0ef8 ffffffff821195C0 ffff88006d20f340
[246351.451822] 8000000000000000 8000000000000000 0000000000000000 ffffffff8109653f
[246351.451929] ffff88006d20f340 ffff88006cfec010 ffff88006cfec6e8 ffffffff81ae8844
[246351.452035] Call Trace:
[246351.452076]  [<ffffffff810aOef8>] ? pick_next_task_fair+0x3e/0x13f
[246351.452159]  [<ffffffff8109653f>] ? pick_next_task+0x4e/0x68
[246351.452236]  [<ffffffff81ae8844>] ? __schedule+0x1ca/0x522
[246351.452311]  [<ffffffff810943da>] ? smpboot_thread_fn+0x155/0x1a8
[246351.452392]  [<ffffffff81094285>] ? in_egroup_p+0x34/0x34
[246351.452465]  [<ffffffff8108e2b2>] ? kthread+0xb7/0xbf
[246351.452533]  [<ffffffff8108e1fb>] ? __kthread_parkme+0x6c/0x6c
[246351.452611]  [<ffffffff81aebe49>] ? ret_from_fork+0x49/0x80
[246351.452686]  [<ffffffff8108e1fb>] ? __kthread_parkme+0x6c/0x6c
[246351.452760] Code: 89 fb 48 8b 13 31 C0 48 85 d2 74 11 48 8b 42 08 48 85 c0 74 05 48 89 c2 eb f2 48 89 d0 5b 48 Of ba 2c 24 3f c3 53 48 89 fb 31 c0 <48> 3b 1b 74 2e 48 8b 43 08 48 85 c0 74 17 48 8b 50 10 48 85 d2
[246351.453210] RIP  [<ffffffff8140287f>] rb_next+0x6/0x41
[246351.453281]  RSP <ffffc90000343dc0>
[246351.453327] CR2: 0000000000000010
[246351.500469] ---[ end trace 8cefd17e1830d346 ]---
[246351.500534] Kernel panic - not syncing: grsec: halting the system due to suspicious kernel crash caused by root
[246351.500876] Kernel Offset: 0x0 from Oxffffffff81000000 (relocation range: Oxffffffff80000000-Oxffffffff9fffffff)
[246351.501011] drm_kms_helper: panic occurred, switching back to text console