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SubjectRe: KASAN: use-after-free Write in tcindex_change
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syzbot suspects this bug was fixed by commit:

commit 0d1c3530e1bd38382edef72591b78e877e0edcd3
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Thu Mar 12 05:42:28 2020 +0000

net_sched: keep alloc_hash updated after hash allocation

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15a956d7e00000
start commit: ac309e77 Merge branch 'for-linus' of git://git.kernel.org/..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=6dfa02302d6db985
dashboard link: https://syzkaller.appspot.com/bug?extid=ba4bcf1563f90386910f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1771b973e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1248a61de00000

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

#syz fix: net_sched: keep alloc_hash updated after hash allocation

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

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