Date: Wed, 19 Mar 2008 00:07:54 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Panic of 8-CURRENT in VMWare Message-ID: <frpi0b$vur$1@ger.gmane.org> In-Reply-To: <20080318124019.O910@desktop> References: <frjsqn$gde$1@ger.gmane.org> <frmtpi$fpp$1@ger.gmane.org> <20080318124019.O910@desktop>
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Jeff Roberson wrote:
>=20
> On Tue, 18 Mar 2008, Ivan Voras wrote:
>=20
>> Ivan Voras wrote:
>>> Hi,
>>> I cannot boot a very recent build (minutes ago) of 8-CURRENT on=20
>>> VMWare Server. Panic ("integer divide fault" - is this division by=20
>>> zero?) is in sched_rr_interval().
>>>
>>> More info here:
>>> http://ivoras.sharanet.org/stuff/panic/
>>>
>>> It might be because I'm trying to run without WITNESS+INVARIANTS.
>>
>> No, building a GENERIC kernel doesn't change anything. It's also not a=
=20
>> cvsup glitch - todays sources panic in exactly the same way.
>>
>>
> Can you tell me what the values of:
>=20
> sysctl kern.sched.slice
>=20
> and
>=20
> sysctl kern.clockrate
>=20
> are?
The machine doesn't finish booting the kernel (i.e. init isn't executed) =
and fetching sysctls apparently isn't supported by the kernel debugger=20
(though it would be nice if it did work, at least for simple variables).
The only old kernel I have is 7.0RC1, and in it I can only access=20
kern.clockrate, which is { hz=3D50, tick=3D20000, profhz=3D33, stathz=3D6=
}.
Since you brought up the issue of clocks, I removed the tuning of=20
kern.hz (it was present there practically forever) and the panic's gone. =
I use low values for kern.hz in VMWare to (noticably) reduce problems=20
with clock drift and context switches, so it would be nice to not have=20
the kernel panic with it :)
Apparently lowering kern.hz works upto about 75 - anything lower=20
triggers the integer divide fault.
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