Shamelessly copied from dchinner's: ad650f5b xfs: fallback to vmalloc for large buffers in xfs_attrmulti_attr_get xfsdump uses a large buffer for extended attributes, which has a kmalloc'd shadow buf
xfsdump uses a large buffer for extended attributes, which has a kmalloc'd shadow buffer in the kernel. This can fail after the system has been running for some time as it is a high order allocation.