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SubjectRe: WARNING: refcount bug in chrdev_open
syzbot suspects this bug was fixed by commit:

commit 68faa679b8be1a74e6663c21c3a9d25d32f1c079
Author: Will Deacon <>
Date: Thu Dec 19 12:02:03 2019 +0000

chardev: Avoid potential use-after-free in 'chrdev_open()'

bisection log:
start commit: 81b6b964 Merge branch 'master' of git://
git tree: upstream
kernel config:
dashboard link:
syz repro:
C reproducer:

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

#syz fix: chardev: Avoid potential use-after-free in 'chrdev_open()'

For information about bisection process see:

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