syzbot


INFO: rcu detected stall in br_handle_frame (2)
Status: upstream: reported C repro on 2019/12/24 13:55
Reported-by: syzbot+dc9071cc5a85950bdfce@syzkaller.appspotmail.com
Fix commit: d9e15a27 pkt_sched: fq: do not accept silly TCA_FQ_QUANTUM
Patched 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-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-upstream-kmsan-gce]
First crash: 58d, last: 58d

Cause bisection: the bug happens on the oldest tested release
Crash: INFO: rcu detected stall in corrupted (log)
Repro: C syz .config
similar bugs (4):
Kernel Title Repro Bisected Count Last Reported Patched Status
upstream INFO: rcu detected stall in br_handle_frame C cause 341 154d 159d 14/16 fixed on 2019/10/09 10:54
linux-4.14 INFO: rcu detected stall in br_handle_frame (2) C fix 1 59d 59d 1/1 fixed on 2020/01/19 15:05
linux-4.14 INFO: rcu detected stall in br_handle_frame C fix 15 151d 163d 1/1 fixed on 2019/12/07 19:24
linux-4.19 INFO: rcu detected stall in br_handle_frame C fix 41 151d 163d 1/1 fixed on 2019/12/07 19:18

Sample crash report:

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci-upstream-kasan-gce-selinux-root 2019/12/20 14:55 upstream 7e0165b2 e30cbdae .config log report syz C davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com
ci-upstream-kasan-gce 2019/12/20 13:44 upstream 7e0165b2 e30cbdae .config log report syz C davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com