Re: KASAN: use-after-free Read in get_mem_cgroup_from_mm

[syzbot]

Bisection is inconclusive: the first bad commit could be any of:

2c43838c sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default
bf29cb23 sched/isolation: Make CONFIG_NO_HZ_FULL select CONFIG_CPU_ISOLATION
d94d1053 sched/isolation: Document boot parameters dependency on  
CONFIG_CPU_ISOLATION=y
4c470317 Merge branch 'sched-urgent-for-linus' of  
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1592b037200000
start commit:   0072a0c1
git tree:       upstream
dashboard link: https://syzkaller.appspot.com/bug?extid=cbb52e396df3e565ab02
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12835e25400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=172fa5a3400000

For information about bisection process see: https://goo.gl/tpsmEJ#bisection