syzbot


INFO: rcu detected stall in sys_exit_group (6)
Status: upstream: reported C repro on 2020/09/24 09:26
Reported-by: syzbot+f04854e1c5c9e913cc27@syzkaller.appspotmail.com
Fix commit: rcu: Don't invoke try_invoke_on_locked_down_task() with irqs disabled
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: 85d, last: 25d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_exit_group (2) 56 327d 328d 0/17 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_exit_group (3) 8 292d 292d 0/17 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_exit_group (4) 13 292d 292d 0/17 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_exit_group (5) 1 213d 213d 0/17 auto-closed as invalid on 2020/06/25 07:58
upstream INFO: rcu detected stall in sys_exit_group C done 1 408d 404d 14/17 fixed on 2019/10/09 10:54

Sample crash report:

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-kasan-gce-selinux-root 2020/09/30 20:03 upstream 02de58b2 8516f6d3 .config log report syz C fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root 2020/09/23 17:08 upstream 805c6d3c 287cd75a .config log report syz C fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce 2020/08/24 11:00 upstream cb957121 cef5ae68 .config log report linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-root 2020/08/02 01:57 upstream d52daa86 d895b3be .config log report davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com