Thomas Gleixner wrote:
> On Mon, 2007-02-19 at 18:00 +0100, Wolfgang Grandegger wrote:
>> Hello,
>>
>> sometimes I get the following message when calling ktime_get_real() from 
>> my interrupt handler:
> 
> SMP machine ?

No, it's my old DELL Inspiron 5000e notebook (with a PIII at 600 MHz).

>> BUG: time warp detected!
>> prev > now, 104357354c79dfed > 1043573435312fb2:
>> = 4685606971 delta, on CPU#0
>>   [<c0103d51>] dump_trace+0x68/0x1d9
>>   [<c0103edd>] show_trace_log_lvl+0x1b/0x36
>>   [<c01044dd>] show_trace+0xf/0x11
>>   [<c010455e>] dump_stack+0x12/0x14
>>   [<c012f1b2>] ktime_get_real+0x10/0x2c
>>   [<e09c03ad>] rtcan_rcv+0x12/0x99 [xeno_can]
>>   [<e09c951d>] rtcan_sja_interrupt+0x220/0x43e [xeno_can_sja1000]
>>   [<e0992018>] _rtdm_irq_trampoline+0x15/0x34 [xeno_rtdm]
>>   [<c0145eb7>] handle_IRQ_event+0x41/0xb7
>>   [<c0146334>] thread_simple_irq+0x31/0x5f
>>   [<c01468f8>] do_irqd+0xbd/0x249
>>   [<c012c531>] kthread+0xa0/0xcb
>>   [<c010397b>] kernel_thread_helper+0x7/0x10
>>   =======================
>> ---------------------------
>> | preempt count: 00000000 ]
>> | 0-level deep critical section nesting:
>> ----------------------------------------
>>
>> Any idea how this can happen?
> 
> Can you please provide a boot log ?

Attached is the boot log.

Thanks.

Wolfgang.