linux-kernel - Re: INFO: task hung in collapse_huge

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Message-ID: <e76ea707-b127-5071-4bcf-2ac472b0d106@I-love.SAKURA.ne.jp>
Date:   Mon, 11 Jun 2018 19:56:34 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot <syzbot+e65df5e4d866512cd91d@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com
Cc:     akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        hannes@...xchg.org, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        rientjes@...gle.com, shli@...com, sj38.park@...il.com,
        willy@...radead.org, yang.s@...baba-inc.com
Subject: Re: INFO: task hung in collapse_huge_page

khugepaged is trying to hold mm->mmap_sem for write, which is held
for read by a thread which is stuck at __sb_start_write(). Therefore,

#syz dup: INFO: task hung in __sb_start_write