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Subject: Re: Large backwards time steps panic 2.5.73
From: James Bottomley <James.Bottomley@steeleye.com>
To: john stultz <johnstul@us.ibm.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@digeo.com>
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On Tue, 2003-06-24 at 15:06, john stultz wrote:
> The only bits the patch should touch are used in adjtimex, and adjtimex
> is very limited on how much it can adjust time. If you're a year off or
> whatever, its more likely ntpdate is calling stime/settimeofday. 
> 
> Could you boot w/o ntp starting up, then manually run  "ntpdate -b
> <server>" to see if that causes it as well? 

I can't seem to reproduce this with any sort of regularity.  The only
data points I have are

- It doesn't occur when the adjtimex reversion is backed out
- It seems to occur shortly after the machine is rebooted with the clock
set to the future.
- it reproduces much more readily if ntpd is running

I've stuck some debugging code in there and find that the ->base for the
timer is NULL and the timer function is igmp_ifc_timer_expire.

I'll continue looking at this.

James



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