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SubjectRe: KASAN: use-after-free Read in ucma_close (2)
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Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+cc6fc752b3819e082d0c@syzkaller.appspotmail.com

Tested on:

commit: 7c003f9a RDMA/ucma: Rework ucma_migrate_id() to avoid race..
git tree: https://github.com/jgunthorpe/linux ucma_migrate_fix
kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299
dashboard link: https://syzkaller.appspot.com/bug?extid=cc6fc752b3819e082d0c
compiler: gcc (GCC) 10.1.0-syz 20200507

Note: testing is done by a robot and is best-effort only.

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