We have a HP Proliant DL180 G6 server with 12 GB RAM and a 600 GB xfs filesystem. The server is running Lotus Domino and Domino data is on this xfs filesystem. Today our largest and most heavily used Domino database (54 GB, ca 600 simultaneous users) experienced some problems which from Domino side looked like database access deadlocks. At the same time following messages repeatedly appeared in /var/log/messages:

XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250)

The server doesn't seem to be low on memory - monitoring shows that amount of cached memory never fell below 7 GB while this problem was occurring. Other than that, I am frankly at a loss on how to troubleshoot this. The OS is SLES11 SP3 x86_64 fully patched, running kernel :

Linux data3 3.0.101-0.29-default #1 SMP Tue May 13 08:40:57 UTC 2014 (9ec28a0) x86_64 x86_64 x86_64 GNU/Linux

Is it possible that this is a kernel bug?