syzbot


WARNING: refcount bug in qdisc_put (2)
Status: fixed on 2020/09/25 01:17
Reported-by: syzbot+b33c1cb0a30ebdc8a5f9@syzkaller.appspotmail.com
Fix commit: 5438dd45 net_sched: fix error path in red_init()
First crash: 34d, last: 34d

Cause bisection: introduced by (bisect log):

commit aee9caa03fc3c8b02f8f31824354d85f30e562e0
Author: Petr Machata <petrm@mellanox.com>
Date: Fri Jun 26 22:45:28 2020 +0000

  net: sched: sch_red: Add qevents "early_drop" and "mark"

Crash: WARNING: refcount bug in qdisc_create (log)
Repro: C syz .config
similar bugs (1):
Kernel Title Repro Bisected Count Last Reported Patched Status
upstream WARNING: refcount bug in qdisc_put 5 729d 730d 12/17 fixed on 2018/11/12 21:25
Patch testing requests:
Created Duration User Patch Repo Result
2020/08/26 22:38 16m xiyou.wangcong@gmail.com https://github.com/congwang/linux.git net OK

Sample crash report:

Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-kasan-gce 2020/08/25 14:39 upstream 6a9dc5fd 344da168 .config log report syz C 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
ci-upstream-kasan-gce-root 2020/08/25 07:52 upstream 6a9dc5fd 344da168 .config log report syz C 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
ci-upstream-kasan-gce-386 2020/08/25 22:59 upstream abb3438d 344da168 .config log report syz C 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
ci-upstream-net-this-kasan-gce 2020/08/25 07:58 net 59ebb430 344da168 .config log report syz C 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
ci-upstream-net-kasan-gce 2020/08/25 07:31 net-next 85eb5bc3 344da168 .config log report syz C 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
ci-upstream-linux-next-kasan-gce-root 2020/08/25 15:44 linux-next 3a00d3df 344da168 .config log report syz C 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
ci-upstream-net-kasan-gce 2020/08/25 06:46 net-next 85eb5bc3 344da168 .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