Richard Davies wrote: > I have a test case in which I can often crash an entire machine by running > dd to a file with a memcg with relatively generous limits. This is > simplified from real world problems with heavy disk i/o inside containers. > > The crashes are easy to trigger when dding to create a file on btrfs. On > ext3, typically there is just an error in the kernel log, although > occasionally it also crashes. A further note - the ext3 SLUB errors occur when dding into a ext3 file alone. The few ext3 crashes occurred when dding into a btrfs file for a while without a crash, then switching to dding into an ext3 file. So the "ext3 crashes" could actually be due to btrfs cached data still in memory - i.e. all crashes could be due to btrfs use. Richard. -- 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>