linux-kernel - Re: WARNING: locking bug in split_huge_page_to

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Date:   Tue, 23 Apr 2019 10:53:26 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     syzbot <syzbot+35a50f1f6dfd5a0d7378@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, aneesh.kumar@...ux.ibm.com,
        dave.jiang@...el.com, hughd@...gle.com, jglisse@...hat.com,
        jrdr.linux@...il.com, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        rientjes@...gle.com, syzkaller-bugs@...glegroups.com,
        vbabka@...e.cz
Subject: Re: WARNING: locking bug in split_huge_page_to_list

On Tue, Apr 23, 2019 at 09:13:06AM -0700, syzbot wrote:
> DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)
> WARNING: CPU: 0 PID: 1553 at kernel/locking/lockdep.c:3673
> __lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673
>  down_write+0x38/0x90 kernel/locking/rwsem.c:70
>  anon_vma_lock_write include/linux/rmap.h:120 [inline]

All anon_vmas share the same lockdep map, so I think this is just a
victim of someone else who's taken all the lockdep classes.