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List:       netfilter
Subject:    timers in linux kernel
From:       "Giacomo" <delleceste () gmail ! com>
Date:       2005-10-29 12:05:44
Message-ID: 001c01c5dc81$191cfff0$0300a8c0 () giacomino
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----- Original Message ----- 
From: "Giacomo" <delleceste@gmail.com>
To: <netfilter-devel-request@lists.netfilter.org>
Sent: Saturday, October 29, 2005 10:56 AM
Subject: timers in linux kernel


> Good morning, in my kernel code, which handles timeouts for connection 
> tables in a linked list, i do:
> 
> inline void update_timer_of_state_entry(struct state_table *sttable)
> {
> if (sttable->state.state == ESTABLISHED)
>  mod_timer(&sttable->timer_statelist,
>     jiffies + HZ * state_lifetime);
> else
>  mod_timer(&sttable->timer_statelist,
>     jiffies + HZ * setup_shutd_state_lifetime);
> }
> 
> sttable is a structure which contains a struct timer_list.
> 
> In:
> 
> mod_timer(&sttable->timer_statelist,
>     jiffies + HZ * state_lifetime);
> 
> i update the timeout for the structures, so that when timer expires, 
> structure is removed from linked list.
> 
> The problem is that when state lifetime is long, let's say 2592000 for 
> instance, kernel goes in panic!
> 
> If the value is low, say 300, or higher 259200000, ok!
> 
> I suspect a problem of overflow .. is it possible?
> 
> What can be wrong?
> 
> Thanks a lot for any hint!
> 
> Giacomo.
> 
>

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