syzbot


INFO: rcu detected stall in netlink_sendmsg (3)
Status: fixed on 2020/02/18 14:31
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: d9e15a273306 pkt_sched: fq: do not accept silly TCA_FQ_QUANTUM
First crash: 710d, last: 657d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: INFO: rcu detected stall in corrupted (log)
Repro: C syz .config
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in netlink_sendmsg (2) C done 11 806d 812d 14/22 fixed on 2019/10/09 10:54
linux-4.19 INFO: rcu detected stall in netlink_sendmsg C done 3 804d 809d 1/1 fixed on 2019/12/10 03:52
upstream INFO: rcu detected stall in netlink_sendmsg syz 83 1015d 1071d 12/22 fixed on 2019/03/06 07:43
upstream INFO: rcu detected stall in netlink_sendmsg (4) C done 32 13d 607d 0/22 upstream: reported C repro on 2020/03/31 17:43

Sample crash report:

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2019/12/21 09:15 upstream 6398b9fc818e bc586918 .config log report syz C
ci-upstream-net-this-kasan-gce 2019/12/20 02:23 net 6fa9a115fe7c 36650b4b .config log report syz C
ci-upstream-kasan-gce-selinux-root 2020/01/26 16:14 upstream 2821e26f3a0a dd56146d .config log report
ci-upstream-kasan-gce 2020/01/22 10:27 upstream d96d875ef5dd 8eda0b95 .config log report
ci-upstream-net-kasan-gce 2020/02/11 09:48 net-next fdfa3a6778b1 084454ae .config log report
ci-upstream-net-kasan-gce 2020/02/03 10:31 net-next 9f68e3655aae 93e5e335 .config log report