netdev - WARNING: suspicious RCU usage in bond_ipsec_add

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Date:   Mon, 06 Jul 2020 08:42:25 -0700
From:   syzbot <syzbot+582c98032903dcc04816@...kaller.appspotmail.com>
To:     andy@...yhouse.net, davem@...emloft.net, j.vosburgh@...il.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        vfalico@...il.com
Subject: WARNING: suspicious RCU usage in bond_ipsec_add_sa

Hello,

syzbot found the following crash on:

HEAD commit:    e44f65fd xen-netfront: remove redundant assignment to vari..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16148f87100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=829871134ca5e230
dashboard link: https://syzkaller.appspot.com/bug?extid=582c98032903dcc04816
compiler:       gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+582c98032903dcc04816@...kaller.appspotmail.com

=============================
WARNING: suspicious RCU usage
5.8.0-rc2-syzkaller #0 Not tainted
-----------------------------
drivers/net/bonding/bond_main.c:387 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor.0/5186:
 #0: ffff888089791a28 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{3:3}, at: xfrm_netlink_rcv+0x5c/0x90 net/xfrm/xfrm_user.c:2687

stack backtrace:
CPU: 1 PID: 5186 Comm: syz-executor.0 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 bond_ipsec_add_sa+0x1c8/0x220 drivers/net/bonding/bond_main.c:387
 xfrm_dev_state_add+0x2da/0x7b0 net/xfrm/xfrm_device.c:268
 xfrm_state_construct net/xfrm/xfrm_user.c:655 [inline]
 xfrm_add_sa+0x2166/0x34f0 net/xfrm/xfrm_user.c:684
 xfrm_user_rcv_msg+0x414/0x700 net/xfrm/xfrm_user.c:2680
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2688
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007ff7e9a92c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000005027e0 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a45 R14: 00000000004cd2c9 R15: 00007ff7e9a936d4
bond0: (slave bond_slave_0): Slave does not support ipsec offload

---
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