On Mon, May 10, 2021 at 11:12:21AM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote: > Hello, > > Why is order 6 allocation required for "cat /proc/sys/kernel/tainted" ...? > I'm seeing (occasional) failures in one VM (with 65d uptime): > > [5674989.634561] cat: page allocation failure: order:6, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=user.slice,mems_allowed=0 > [5674989.645432] CPU: 0 PID: 2717524 Comm: cat Not tainted 5.10.19-200.fc33.x86_64 #1 The underlying problem is that 'cat' is asking to do a 128kB read (!) so we allocate 256kB (!) of contiguous (!) memory. This is already mostly fixed upstream. Please upgrade your kernel.
