SASL - duplicate alarms bug

[Francesco Cesarini (Erlang Training & Consulting)]

The SASL Alarm handler is a very simple handler, provided to allow users 
to get started quickly. Somewhere in the documentation (And in both our 
and Ericsson's OTP courses) users are encouraged to develop their own 
handler and replace it with a more complex one.

Regards,
Francesco
--
http://www.erlang-consulting.com

Serge Aleynikov wrote:
> Is there a reason that the SASL's alarm handler doesn't check for 
> duplicate alarms before adding new ones to the list?
> 
> If you do the following on the system with low disk space / free memory:
> 
> 1. Start SASL
> 2. Start OS_MON
> 3. Stop  OS_MON
> 4. Start OS_MON
> 
> you'll get duplicate alarms that are not easily clearled (you'd need to 
> call alarm_handler:clear_alarm() multiple times for the same AlarmID...
> 
> 17> alarm_handler:get_alarms().
> [{system_memory_high_watermark,[]},
>  {{disk_almost_full,"/mnt/cdrom"},[]},
>  {{disk_almost_full,"/usr"},[]},
>  {system_memory_high_watermark,[]},
>  {{disk_almost_full,"/mnt/cdrom"},[]},
>  {{disk_almost_full,"/usr"},[]}]
> 18> alarm_handler:clear_alarm(system_memory_high_watermark).
> [{{disk_almost_full,"/mnt/cdrom"},[]},
>  {{disk_almost_full,"/usr"},[]},
>  {system_memory_high_watermark,[]},
>  {{disk_almost_full,"/mnt/cdrom"},[]},
>  {{disk_almost_full,"/usr"},[]}]
> 
> This looks like a bug to me.
> 
> Serge
> 
>