netdev - Re: [PATCH net] net: sched: add rcu annotations around qdisc->qdisc

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Date: Tue, 6 Jun 2023 16:15:03 -0700
From: Peilin Ye <yepeilin.cs@...il.com>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	syzbot <syzkaller@...glegroups.com>,
	Vlad Buslov <vladbu@...dia.com>,
	Peilin Ye <peilin.ye@...edance.com>
Subject: Re: [PATCH net] net: sched: add rcu annotations around
 qdisc->qdisc_sleeping

On Tue, Jun 06, 2023 at 11:50:45AM -0400, Jamal Hadi Salim wrote:
> > syzbot reported a race around qdisc->qdisc_sleeping [1]
> >
> > It is time we add proper annotations to reads and writes to/from
> > qdisc->qdisc_sleeping.
> >
> > [1]
> > BUG: KCSAN: data-race in dev_graft_qdisc / qdisc_lookup_rcu
> >
> > read to 0xffff8881286fc618 of 8 bytes by task 6928 on cpu 1:
> > qdisc_lookup_rcu+0x192/0x2c0 net/sched/sch_api.c:331
> > __tcf_qdisc_find+0x74/0x3c0 net/sched/cls_api.c:1174
> > tc_get_tfilter+0x18f/0x990 net/sched/cls_api.c:2547
> > rtnetlink_rcv_msg+0x7af/0x8c0 net/core/rtnetlink.c:6386
> > netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2546
> > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6413
> > netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
> > netlink_unicast+0x56f/0x640 net/netlink/af_netlink.c:1365
> > netlink_sendmsg+0x665/0x770 net/netlink/af_netlink.c:1913
> > sock_sendmsg_nosec net/socket.c:724 [inline]
> > sock_sendmsg net/socket.c:747 [inline]
> > ____sys_sendmsg+0x375/0x4c0 net/socket.c:2503
> > ___sys_sendmsg net/socket.c:2557 [inline]
> > __sys_sendmsg+0x1e3/0x270 net/socket.c:2586
> > __do_sys_sendmsg net/socket.c:2595 [inline]
> > __se_sys_sendmsg net/socket.c:2593 [inline]
> > __x64_sys_sendmsg+0x46/0x50 net/socket.c:2593
> > do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > write to 0xffff8881286fc618 of 8 bytes by task 6912 on cpu 0:
> > dev_graft_qdisc+0x4f/0x80 net/sched/sch_generic.c:1115
> > qdisc_graft+0x7d0/0xb60 net/sched/sch_api.c:1103
> > tc_modify_qdisc+0x712/0xf10 net/sched/sch_api.c:1693
> > rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6395
> > netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2546
> > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6413
> > netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
> > netlink_unicast+0x56f/0x640 net/netlink/af_netlink.c:1365
> > netlink_sendmsg+0x665/0x770 net/netlink/af_netlink.c:1913
> > sock_sendmsg_nosec net/socket.c:724 [inline]
> > sock_sendmsg net/socket.c:747 [inline]
> > ____sys_sendmsg+0x375/0x4c0 net/socket.c:2503
> > ___sys_sendmsg net/socket.c:2557 [inline]
> > __sys_sendmsg+0x1e3/0x270 net/socket.c:2586
> > __do_sys_sendmsg net/socket.c:2595 [inline]
> > __se_sys_sendmsg net/socket.c:2593 [inline]
> > __x64_sys_sendmsg+0x46/0x50 net/socket.c:2593
> > do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > Reported by Kernel Concurrency Sanitizer on:
> > CPU: 0 PID: 6912 Comm: syz-executor.5 Not tainted 6.4.0-rc3-syzkaller-00190-g0d85b27b0cc6 #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
> >
> > Fixes: 3a7d0d07a386 ("net: sched: extend Qdisc with rcu")
> > Reported-by: syzbot <syzkaller@...glegroups.com>
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > Cc: Vlad Buslov <vladbu@...dia.com>
> 
> Acked-by: Jamal Hadi Salim<jhs@...atatu.com>
> 
> +Cc Peilin. Peilin any update on what you are chasing on grafting?

Hi Jamal,

Sorry for the delay, I was looking at how Qdisc::flags are accessed since
Vlad mentioned it.  I'll update in that thread hopefully today.

Thanks,
Peilin Ye