syzbot


KCSAN: data-race in __rcu_read_unlock / sync_rcu_exp_select_node_cpus (2)
Status: premoderation: reported on 2019/11/25 22:32
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: rcu: Add *_ONCE() to rcu_node ->exp_tasks plus locking
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 88d, last: 37d
similar bugs (1):
Kernel Title Repro Bisected Count Last Reported Patched Status
upstream KCSAN: data-race in __rcu_read_unlock / sync_rcu_exp_select_node_cpus 1 109d 108d 0/17 closed as invalid on 2019/11/19 13:44

Sample crash report:

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci2-upstream-kcsan-gce 2020/01/15 20:35 https://github.com/google/ktsan.git kcsan 245a4300 f9b69507 .config log report akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce 2020/01/15 13:57 https://github.com/google/ktsan.git kcsan 245a4300 fa12bd3c .config log report axboe@kernel.dk, justin@coraid.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce 2019/12/22 18:07 https://github.com/google/ktsan.git kcsan 245a4300 8b967267 .config log report axboe@kernel.dk, justin@coraid.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce 2019/11/29 21:44 https://github.com/google/ktsan.git kcsan ef798c30 4f7e1d0f .config log report akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce 2019/11/26 21:08 https://github.com/google/ktsan.git kcsan ef798c30 1048481f .config log report axboe@kernel.dk, justin@coraid.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce 2019/11/25 21:31 https://github.com/google/ktsan.git kcsan 5863cc79 598ca6c8 .config log report akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org