linux-kernel - Re: [syzbot] possible deadlock in static_key_slow

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Date:   Wed, 02 Nov 2022 11:14:25 -0700
From:   syzbot <syzbot+c39682e86c9d84152f93@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible deadlock in static_key_slow_inc (2)

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

kernel/cgroup/legacy_freezer.c:353:35: error: passing argument 1 of 'static_key_slow_inc_cpuslocked' from incompatible pointer type [-Werror=incompatible-pointer-types]
kernel/cgroup/legacy_freezer.c:364:36: error: passing argument 1 of 'static_key_slow_dec_cpuslocked' from incompatible pointer type [-Werror=incompatible-pointer-types]
kernel/cgroup/legacy_freezer.c:382:2: error: implicit declaration of function 'cpus_read_lock'; did you mean 'rcu_read_lock'? [-Werror=implicit-function-declaration]
kernel/cgroup/legacy_freezer.c:411:2: error: implicit declaration of function 'cpus_read_unlock'; did you mean 'rcu_read_unlock'? [-Werror=implicit-function-declaration]

Tested on:

commit:         a2c65a9d net: dsa: fall back to default tagger if we c..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
dashboard link: https://syzkaller.appspot.com/bug?extid=c39682e86c9d84152f93
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=127fa2ca880000