Re: Commit "new primitive: discard_new_inode()" introduces a problem

[Al Viro]

On Wed, Aug 01, 2018 at 05:43:35PM +0300, Kirill Tkhai wrote:
> Hi, Al,
> 
> commit 22dc9a1682722fda8603991595528b87e90436f6
> Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Date:   Thu Jun 28 15:53:17 2018 -0400
> 
>     new primitive: discard_new_inode()
> 
> from current linux-next introduces the following problem.
> It reproduces 100% in my test VM:
> 
> # cat /etc/mtab 
> /dev/sda1 / ext4 rw 0 0
> proc /proc proc rw 0 0
> sysfs /sys sysfs rw 0 0
> devpts /dev/pts devpts rw,gid=5,mode=620 0 0
> tmpfs /dev/shm tmpfs rw,noexec,nosuid,nodev 0 0
> # echo 3 > /proc/sys/vm/drop_caches 
> # cat /etc/mtab 
> cat: /etc/mtab: Cannot allocate memory

Can't reproduce here...  Could you post your .config (and
toolchain information, for the sake of completeness)?