9.0 spontaneously reboots

[Volodymyr Kostyrko]

Hi all.

I have one machine behaving unstable. This happened before 9.0. After 
upgrading to 9.0 machine was given a light load and now it reboots. 
Memory was already tested (without any errors) and changed after another 
reboot.

I just have one snippet in the logs:

Mar 12 07:51:56 beeb kernel: interrupt                   total
Mar 12 07:51:56 beeb kernel: irq18: ehci0 uhci5+                  325
Mar 12 07:51:56 beeb kernel: irq19: uhci2 uhci4                  4350
Mar 12 07:51:56 beeb kernel: irq23: ehci1 uhci3                272776
Mar 12 07:51:56 beeb kernel: cpu0:timer                     306304013
Mar 12 07:51:56 beeb kernel: irq256: mpt0                   106758743
Mar 12 07:51:56 beeb kernel: cpu1:timer                      50588836
Mar 12 07:51:56 beeb kernel: cpu14:timer                     40862828
Mar 12 07:51:56 beeb kernel: cpu12:timer                     66660057
Mar 12 07:51:56 beeb kernel: cpu6:timer                      51650325
Mar 12 07:51:56 beeb kernel: cpu13:timer                     35826328
Mar 12 07:51:56 beeb kernel: cpu3:timer                      47414874
Mar 12 07:51:56 beeb kernel: cpu10:timer                    101158759
Mar 12 07:51:56 beeb kernel: cpu2:timer                     116817563
Mar 12 07:51:56 beeb kernel: cpu8:timer                     137051223
Mar 12 07:51:56 beeb kernel: cpu7:timer                      31732225
Mar 12 07:51:56 beeb kernel: cpu11:timer                     43244351
Mar 12 07:51:56 beeb kernel: cpu4:timer                      83143936
Mar 12 07:51:56 beeb kernel: cpu9:timer                      49622770
Mar 12 07:51:56 beeb kernel: cpu5:timer                      40662969
Mar 12 07:51:56 beeb kernel: cpu15:timer                     27434472
Mar 12 07:51:56 beeb kernel: irq257: igb0:que 0              20058599
Mar 12 07:51:56 beeb kernel: irq258: igb0:que 1              15054525
Mar 12 07:51:56 beeb kernel: irq259: igb0:que 2              14738762
Mar 12 07:51:56 beeb kernel: irq260: igb0:que 3              14702046
Mar 12 07:51:56 beeb kernel: irq261: igb0:que 4              14842310
Mar 12 07:51:56 beeb kernel: irq262: igb0:que 5              15035818
Mar 12 07:51:56 beeb kernel: irq263: igb0:que 6              14826606
Mar 12 07:51:56 beeb kernel: irq264: igb0:que 7              14924631
Mar 12 07:51:56 beeb kernel: irq265: igb0:link                      2
Mar 12 07:51:56 beeb kernel: Total                  1461395023
Mar 12 07:51:56 beeb kernel: KDB: stack backtrace:
Mar 12 07:51:56 beeb kernel: #0 0xffffffff8038d458 at kdb_backtrace+0x58
Mar 12 07:51:56 beeb kernel: #1 0xffffffff80315b4b at watchdog_fire+0x8b
Mar 12 07:51:56 beeb kernel: #2 0xffffffff80315e10 at hardclock_anycpu+0x2a0
Mar 12 07:51:56 beeb kernel: #3 0xffffffff80583278 at handleevents+0xd8
Mar 12 07:51:56 beeb kernel: #4 0xffffffff80583e36 at timercb+0x2d6
Mar 12 07:51:56 beeb kernel: #5 0xffffffff805aec46 at 
lapic_handle_timer+0xb6
Mar 12 07:51:56 beeb kernel: #6 0xffffffff80557f2c at Xtimerint+0x8c
Mar 12 07:51:56 beeb kernel: #7 0xffffffff8055c348 at cpu_idle_acpi+0x38
Mar 12 07:51:56 beeb kernel: #8 0xffffffff8055c402 at cpu_idle+0xa2
Mar 12 07:51:56 beeb kernel: #9 0xffffffff80380b7f at sched_idletd+0x37f
Mar 12 07:51:56 beeb kernel: #10 0xffffffff80331d36 at fork_exit+0x76
Mar 12 07:51:56 beeb kernel: #11 0xffffffff8055790e at fork_trampoline+0xe

What should I blame now? Is it some programming error or should I 
continue with testing/changing motherboard and cpu?

-- 
Sphinx of black quartz judge my vow.