Привет всем. Периодически возникают алерты:

/var/log/nginx/error.log
2010/10/01 21:17:26 [alert] 28397#0: ngx_slab_free(): chunk is already free
2010/10/01 21:17:26 [alert] 28397#0: ngx_slab_free(): chunk is already free
2010/10/05 17:47:17 [alert] 28396#0: ngx_slab_free(): chunk is already free
2010/10/05 17:47:17 [alert] 28396#0: ngx_slab_free(): chunk is already free
2010/10/06 20:25:53 [alert] 28396#0: ngx_slab_free(): chunk is already free


Кто-нибудь подскажет в чем тут дело?