[Haifux] Kernel oops, so what?

Kohn Emil Dan emild at cs.technion.ac.il
Fri Jan 15 18:38:09 IST 2010


Hi,

The /proc entry I was talking about is
/proc/sys/kernel/panic_on_oops

 					Emil

On Fri, 15 Jan 2010, Kohn Emil Dan wrote:

> Hi,
>
> IIRC in Linux an OOPS will not necessarily freeze the system (though this 
> can be configured via some /proc entry or at compilation time). If an OOPS 
> occurs in the context of a process, that process will be killed with a 
> SEGFAULT, and the system will attempt to continue to work.
>
> Obviously for mission-critical systems this is a very bad idea as the 
> kernel might be corrupted, but in other cases it works.
>
> 							Emil
>
>
> On Fri, 15 Jan 2010, Eli Billauer wrote:
>
>> Hello,
>>
>>
>> Maybe this is a "boker-tov-eliyahu" thing, but still. I've installed 
>> Fedora 12, just to find out that it warns me about kernel oopses. In my 
>> remote memories, I recall that a kernel oops usually meant that my 
>> hardware was cooking (in those days when Linux was rock solid and 
>> hardware wasn't) and the computer froze completely.
>>
>>
>> Now I get an oops warning every now and then, but nothing really 
>> happens. And I wonder what is going on? Has the dreaded oops become 
>> something one can live with? And then there's this site which collects 
>> oops reports (http://www.kerneloops.org/) which, judging by its sluggish 
>> response, is a pretty busy project. Oopses keep flooding in.
>>
>>
>> So, should I just take it cool and wait for a new kernel with this 
>> fixed, ignoring these messages?
>>
>>
>> Just for the heck of it, the relevant part from /var/log/messages 
>> follows. I am running on a new Gigabyte motherboard. I don't expect 
>> anyone to dissect this. I mean, a report has been submitted.
>>
>>
>>   Eli
>>
>>
>> ----- log follows, for the fun -----
>>
>>
>> Jan 15 14:45:17 test kernel: WARNING: at arch/x86/kernel/hpet.c:390 
>> hpet_next_event+0x5c/0x81() (Not tainted)
>>
>> Jan 15 14:45:17 test kernel: Hardware name: P55-UD3R
>> Jan 15 14:45:17 test kernel: Modules linked in:
>> Jan 15 14:45:17 test kernel: Pid: 0, comm: swapper Not tainted 
>> 2.6.31.5-127.fc12.x86_64 #1
>> Jan 15 14:45:17 test kernel: Call Trace:
>> Jan 15 14:45:17 test kernel: [<ffffffff81051694>] 
>> warn_slowpath_common+0x84/0x9c
>> Jan 15 14:45:17 test kernel: [<ffffffff810516c0>] 
>> warn_slowpath_null+0x14/0x16
>> Jan 15 14:45:17 test kernel: [<ffffffff8102d040>] hpet_next_event+0x5c/0x81
>> Jan 15 14:45:17 test kernel: [<ffffffff8102d08b>] 
>> hpet_legacy_next_event+0x10/0x12
>> Jan 15 14:45:17 test kernel: [<ffffffff81071953>] 
>> clockevents_program_event+0x7a/0x83
>> Jan 15 14:45:17 test kernel: [<ffffffff81072a9d>] 
>> tick_dev_program_event+0x3c/0xaa
>> Jan 15 14:45:17 test kernel: [<ffffffff8107249d>] 
>> tick_broadcast_oneshot_control+0xa4/0x100
>> Jan 15 14:45:17 test kernel: [<ffffffff81071dc7>] tick_notify+0x222/0x379
>> Jan 15 14:45:17 test kernel: [<ffffffff8141d02b>] 
>> notifier_call_chain+0x32/0x5e
>> Jan 15 14:45:17 test kernel: [<ffffffff8106b70c>] 
>> raw_notifier_call_chain+0x14/0x16
>> Jan 15 14:45:17 test kernel: [<ffffffff810717a0>] 
>> clockevents_notify+0x39/0x76
>> Jan 15 14:45:17 test kernel: [<ffffffff812671b1>] 
>> lapic_timer_state_broadcast+0x46/0x48
>> Jan 15 14:45:17 test kernel: [<ffffffff8126772e>] 
>> acpi_idle_enter_bm+0x18a/0x2b5
>> Jan 15 14:45:17 test kernel: [<ffffffff813538a3>] 
>> cpuidle_idle_call+0x8d/0xc2
>> Jan 15 14:45:17 test kernel: [<ffffffff81010c60>] cpu_idle+0xa6/0xe9
>> Jan 15 14:45:17 test kernel: [<ffffffff814145be>] 
>> start_secondary+0x1f3/0x234
>>
>> -- 
>> Web: http://www.billauer.co.il
>>
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