=============================
WARNING: suspicious RCU usage
5.8.0-rc7-syzkaller #0 Not tainted
-----------------------------
net/openvswitch/flow_table.c:940 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
2 locks held by syz-executor.0/9220:
#0: ffffffff8a832390 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:741
#1: ffffffff8aa792e8 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock net/openvswitch/datapath.c:105 [inline]
#1: ffffffff8aa792e8 (ovs_mutex){+.+.}-{3:3}, at: ovs_dp_cmd_new+0x4db/0xea0 net/openvswitch/datapath.c:1707
stack backtrace:
CPU: 0 PID: 9220 Comm: syz-executor.0 Not tainted 5.8.0-rc7-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
ovs_flow_tbl_masks_cache_size+0xc3/0xe0 net/openvswitch/flow_table.c:940
ovs_dp_cmd_fill_info+0x4e4/0x880 net/openvswitch/datapath.c:1539
ovs_dp_cmd_new+0x584/0xea0 net/openvswitch/datapath.c:1728
genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2359
___sys_sendmsg+0xf3/0x170 net/socket.c:2413
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2446
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ccd9
Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f70f724ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002bec0 RCX: 000000000045ccd9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc67427f1f R14: 00007f70f724f9c0 R15: 000000000078bf0c