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SubjectRe: INFO: rcu detected stall in do_swap_page
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syzbot suspects this bug was fixed by commit:

commit 32aaf0553df99cc4314f6e9f43216cd83afc6c20
Author: Pengfei Li <lpf.vector@gmail.com>
Date: Mon Sep 23 22:36:58 2019 +0000

mm/compaction.c: remove unnecessary zone parameter in
isolate_migratepages()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=159dcaaae00000
start commit: c6dd78fc Merge branch 'x86-urgent-for-linus' of git://git...
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=3c8985c08e1f9727
dashboard link: https://syzkaller.appspot.com/bug?extid=2a89b1fb6539ff150c16
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1456f9d0600000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: mm/compaction.c: remove unnecessary zone parameter in
isolate_migratepages()

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

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