On 2018/08/10 23:05, Eric W. Biederman wrote: > > There is a serious problem with mount options today that fsopen does not > address. The problem is that mount options are ignored for block based > filesystems, and any other type of filesystem that follows the same > pattern. > > The script below demonstrates this bug. Showing this bug can cause the > ext4 "acl" "quota" and "user_xattr" options to be silently ignored. > > fsopen has my nack until it addresses this issue. > > I don't know if we can fix this in the context of sys_mount. But we if > we are redoing the option parsing of how we mount filesystems this needs > to be fixed before we start worrying about bug compatibility. > > Hopefully this report is simple and clear enough that we can at least > agree on the problem. > > Eric This might be related to a problem that syzbot is failing to reproduce a problem. https://groups.google.com/forum/#!msg/syzkaller-bugs/R03vI7RCVco/0PijCTrcCgAJ syzbot found a reproducer, and the reproducer was working until next-20180803. But the reproducer is failing to reproduce this problem in next-20180806 despite there is no mm related change between next-20180803 and next-20180806. Therefore, I suspect that the reproducer is no longer working as intended. And there was parser change (David Howells' patch) between next-20180803 and next-20180806. I'm waiting for response from David Howells...
