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

commit 621b6d2ea297d0fb6030452c5bcd221f12165fcf
Author: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Date: Mon Apr 9 10:03:46 2018 +0000

perf/core: Fix use-after-free in uprobe_perf_close()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1068a38c600000
start commit: 86bbbeba Merge branch 'ras-core-for-linus' of git://git.ke..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=5e630e8cb6d3da36
dashboard link: https://syzkaller.appspot.com/bug?extid=cef9473c7fa0fe8ab95e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=162240bb800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17a4e0bb800000

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

#syz fix: perf/core: Fix use-after-free in uprobe_perf_close()

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

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