Hello.

I've got 3.13.0 kernel creshed on boot.  A lot of debug options are on.
Crash:
BUG: unable to handle kernel paging request at 000000012a53f020
IP: [<00000000cf038cc6>] 0xcf038cc6
PGD 2962067 PUD 2965067 PMD 12fe8f067 PTE 800000012a53f962
Oops: 0000 [#1] SMP 
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-debug-amd64 #2
Hardware name: Supermicro X9SCL/X9SCM/X9SCL/X9SCM, BIOS 2.0b 09/17/2012
task: ffffffff81a134c0 ti: ffffffff81a00000 task.ti: ffffffff81a00000
RIP: 0010:[<00000000cf038cc6>]  [<00000000cf038cc6>] 0xcf038cc6
RSP: 0000:ffffffff81a01de0  EFLAGS: 00010083
RAX: 8000000000000000 RBX: 000000012a53f000 RCX: 0000000000000690
RDX: 000000012a53f000 RSI: 00000000cefbff18 RDI: 00000000cf037af4
RBP: 0000000000000690 R08: 0000000000000001 R09: 000000012a53f000
R10: ffff88012a409e80 R11: 0000000000000000 R12: 00000000cefbfe18
R13: 0000000000000001 R14: 0000000000000690 R15: 000000012a53f000
FS:  0000000000000000(0000) GS:ffff88012a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88012a44cc58 CR3: 0000000001a0c000 CR4: 00000000000406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Stack:
 ffffffff810bcf17 ffffffff81a01ee8 ffffffff81306a4a 0000000000000000
 00000000cf046a50 00000000cf038f36 00000000cefbfca0 0000000000000001
 0000000000000800 ffff88012fe8f040 800000012a408963 ffffffff81a01ee8
Call Trace:
 [<ffffffff810bcf17>] ? trace_hardirqs_off_caller+0x87/0x120
 [<ffffffff81306a4a>] ? trace_hardirqs_off_thunk+0x3a/0x3c
 [<ffffffff81064406>] ? efi_call4+0x46/0x80
 [<ffffffff81cc4766>] ? efi_enter_virtual_mode+0x20b/0x3a5
 [<ffffffff81ca8e53>] ? start_kernel+0x3b3/0x443
 [<ffffffff81ca88a9>] ? repair_env_string+0x5c/0x5c
 [<ffffffff81ca8120>] ? early_idt_handlers+0x120/0x120
 [<ffffffff81ca8556>] ? x86_64_start_reservations+0x2a/0x2c
 [<ffffffff81ca869b>] ? x86_64_start_kernel+0x143/0x152
Code:  Bad RIP value.
RIP  [<00000000cf038cc6>] 0xcf038cc6
 RSP <ffffffff81a01de0>
CR2: 000000012a53f020
---[ end trace 2fc4d26cbb5bd681 ]---


Kernel config and full kernel output before the crash are attached.


-- 
Alexandra N. Kossovsky
OKTET Labs (http://www.oktetlabs.ru/)