On Tue 05-02-13 15:49:47, azurIt wrote: [...] > I have another old problem which is maybe also related to this. I > wasn't connecting it with this before but now i'm not sure. Two of our > servers, which are affected by this cgroup problem, are also randomly > freezing completely (few times per month). These are the symptoms: > - servers are answering to ping > - it is possible to connect via SSH but connection is freezed after > sending the password > - it is possible to login via console but it is freezed after typeing > the login > These symptoms are very similar to HDD problems or HDD overload (but > there is no overload for sure). The only way to fix it is, probably, > hard rebooting the server (didn't find any other way). What do you > think? Can this be related? This is hard to tell without further information. > Maybe HDDs are locked in the similar way the cgroups are - we already > found out that cgroup freezeing is related also to HDD activity. Maybe > there is a little chance that the whole HDD subsystem ends in > deadlock? "HDD subsystem" whatever that means cannot be blocked by memcg being stuck. Certain access to soem files might be an issue because those could have locks held but I do not see other relations. I would start by checking the HW, trying to focus on reducing elements that could contribute - aka try to nail down to the minimum set which reproduces the issue. I cannot help you much with that I am afraid. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>