linux-kernel - Re: KASAN: use-after-free Read in get_mem_cgroup_from

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Date:   Fri, 22 Mar 2019 02:36:01 -0700
From:   syzbot <syzbot+cbb52e396df3e565ab02@...kaller.appspotmail.com>
To:     aarcange@...hat.com, akpm@...ux-foundation.org,
        cgroups@...r.kernel.org, dvyukov@...gle.com, hannes@...xchg.org,
        hughd@...gle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mgorman@...e.de, mhocko@...nel.org, peterx@...hat.com,
        rientjes@...gle.com, rppt@...ux.ibm.com, rppt@...ux.vnet.ibm.com,
        syzkaller-bugs@...glegroups.com, vbabka@...e.cz,
        vdavydov.dev@...il.com, willy@...radead.org, zhongjiang@...wei.com
Subject: Re: KASAN: use-after-free Read in get_mem_cgroup_from_mm

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