[DRBD-user] Zombie, Zombie?

Lars Ellenberg Lars.Ellenberg at linbit.com
Mon Apr 26 10:43:06 CEST 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

/ 2004-04-26 03:15:04 +0200
\ Andreas Semt:
> Hello list!
> I use DRBD 0.6.12 (with heartbeat 1.21). Sometimes I get some real high 
> load on my machine (load average around 6) and a zombie process like 
> drbd_syncer_2 or drbd_syncer_3. I believe the zombie process causes the 
> high load. Also i lost a drbd connection without reason (one connection 
> of four).
> Additional information: the zombie processes disappear after some time 
> and the load is normal again. Zombies exist only on the drbd "PRIMARY" 
> machine (all drbd devices in primary mode).
> My questions:
> 1. Could it be a zombie process who killed the drbd connection?

No. It is only killed *after* the connection was lost.
Unfortunately it is not always reaped immediately.
Zombie processes cannot cause load, because they are dead.
They only waste some memory and process slots.

> 2. Why these Zombies live on my machine?
If you care, you can use 0.6.12 CVS HEAD, which differs basically only
by a "reparent to init" call right after our thread startup, as it
should have been from the very begining. now, the "zombies" are reaped
by init almost immediately after their death.


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