syzbot

=============================
WARNING: suspicious RCU usage
5.16.0-rc5-syzkaller #0 Not tainted
-----------------------------
include/net/tc_act/tc_tunnel_key.h:33 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-executor393/3602:
 #0: ffffffff8d313968 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d313968 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] net/core/rtnetlink.c:5567
 #0: ffffffff8d313968 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5567 net/core/rtnetlink.c:5567

stack backtrace:
CPU: 1 PID: 3602 Comm: syz-executor393 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 __dump_stack lib/dump_stack.c:88 [inline] lib/dump_stack.c:106
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 lib/dump_stack.c:106
 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline]
 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] net/sched/act_tunnel_key.c:832
 tcf_tunnel_key_offload_act_setup+0x4f2/0xa20 net/sched/act_tunnel_key.c:832 net/sched/act_tunnel_key.c:832
 offload_action_init net/sched/act_api.c:194 [inline]
 offload_action_init net/sched/act_api.c:194 [inline] net/sched/act_api.c:263
 tcf_action_offload_add_ex+0x279/0x550 net/sched/act_api.c:263 net/sched/act_api.c:263
 tcf_action_offload_add net/sched/act_api.c:294 [inline]
 tcf_action_offload_add net/sched/act_api.c:294 [inline] net/sched/act_api.c:1439
 tcf_action_init+0x601/0x860 net/sched/act_api.c:1439 net/sched/act_api.c:1439
 tcf_action_add+0xf9/0x480 net/sched/act_api.c:1940 net/sched/act_api.c:1940
 tc_ctl_action+0x346/0x470 net/sched/act_api.c:1999 net/sched/act_api.c:1999
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5570 net/core/rtnetlink.c:5570
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2492 net/netlink/af_netlink.c:2492
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] net/netlink/af_netlink.c:1341
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1341 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1917 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg_nosec net/socket.c:704 [inline] net/socket.c:724
 sock_sendmsg+0xcf/0x120 net/socket.c:724 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f896932b2a9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeff6cc4d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f896932b2a9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003