reproducible panic every day at 03:02, probably triggered by daily periodic scipts - help

[Anton Shterenlikht]

>From be at 0x20.net Thu Mar  6 22:02:56 2014
>
>On Thu, Mar 06, 2014 at 12:59:14AM -0800, Anton Shterenlikht wrote:
>> In my initial PR (sparc64 r261798),
>> 
>>  http://www.freebsd.org/cgi/query-pr.cgi?pr=187080
>> 
>> I said that rsync was triggering this panic.
>> While true, I now see that there's more to it.
>> I disabled the rsync, and the cron jobs.
>> Still I get exactly the same panic every
>> night at 03:02:
>> 
>> # grep Dumptime /var/crash/*
>> /var/crash/info.0:  Dumptime: Wed Feb 26 10:10:51 2014
>> /var/crash/info.1:  Dumptime: Thu Feb 27 03:02:14 2014
>> /var/crash/info.2:  Dumptime: Fri Feb 28 03:02:29 2014
>> /var/crash/info.3:  Dumptime: Sat Mar  1 03:02:25 2014
>> /var/crash/info.4:  Dumptime: Tue Mar  4 03:02:01 2014
>> /var/crash/info.5:  Dumptime: Wed Mar  5 03:02:05 2014
>> /var/crash/info.6:  Dumptime: Thu Mar  6 03:02:11 2014
>> /var/crash/info.last:  Dumptime: Thu Mar  6 03:02:11 2014
>> # 
>> 
>> This is likely triggered by one of
>> the daily periodic scipts,
>> after about 1 min from start:
>> 
>> # grep daily /etc/crontab
>> # Perform daily/weekly/monthly maintenance.
>> 1       3       *       *       *       root    periodic daily
>> #
>> 
>> but which one?
> 
>Some time ago I had a similar problem with 8.x. Setting
>
>vm.kmem_size="512M"
>vm.kmem_size_max="512M"
>
>in loader.conf helped. It's just a wild guess but might help.
>-- 
>Bjoern Engels

Was it also on sparc64?
How did you find this out?
I mean what lead you to this discovery?

Thanks

Anton