Warning: Permanently added '10.128.1.43' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 65.403368][ T3602] [ 65.405827][ T3602] ============================= [ 65.410973][ T3602] WARNING: suspicious RCU usage [ 65.416142][ T3602] 5.16.0-rc5-syzkaller #0 Not tainted [ 65.421529][ T3602] ----------------------------- [ 65.426826][ T3602] include/net/tc_act/tc_tunnel_key.h:33 suspicious rcu_dereference_protected() usage! [ 65.436462][ T3602] [ 65.436462][ T3602] other info that might help us debug this: [ 65.436462][ T3602] [ 65.446778][ T3602] [ 65.446778][ T3602] rcu_scheduler_active = 2, debug_locks = 1 [ 65.454897][ T3602] 1 lock held by syz-executor393/3602: [ 65.460344][ T3602] #0: ffffffff8d313968 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 [ 65.469868][ T3602] [ 65.469868][ T3602] stack backtrace: [ 65.475803][ T3602] CPU: 1 PID: 3602 Comm: syz-executor393 Not tainted 5.16.0-rc5-syzkaller #0 [ 65.484546][ T3602] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.494582][ T3602] Call Trace: [ 65.497856][ T3602] [ 65.500769][ T3602] dump_stack_lvl+0xcd/0x134 [ 65.505347][ T3602] tcf_tunnel_key_offload_act_setup+0x4f2/0xa20 [ 65.511578][ T3602] ? tunnel_key_init+0x1c30/0x1c30 [ 65.516675][ T3602] tcf_action_offload_add_ex+0x279/0x550 [ 65.522296][ T3602] ? tc_lookup_action_n+0xf0/0xf0 [ 65.527305][ T3602] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 65.533328][ T3602] tcf_action_init+0x601/0x860 [ 65.538083][ T3602] ? tcf_action_init_1+0x690/0x690 [ 65.543174][ T3602] ? lock_chain_count+0x20/0x20 [ 65.548023][ T3602] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 65.554077][ T3602] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 65.559801][ T3602] ? stack_trace_save+0x8c/0xc0 [ 65.564637][ T3602] ? filter_irq_stacks+0x90/0x90 [ 65.569565][ T3602] tcf_action_add+0xf9/0x480 [ 65.574142][ T3602] ? tca_action_gd+0xe60/0xe60 [ 65.578914][ T3602] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 65.585142][ T3602] ? __nla_parse+0x3d/0x50 [ 65.589546][ T3602] tc_ctl_action+0x346/0x470 [ 65.594119][ T3602] ? tcf_action_add+0x480/0x480 [ 65.598950][ T3602] ? rtnetlink_rcv_msg+0x388/0xb80 [ 65.604054][ T3602] ? tcf_action_add+0x480/0x480 [ 65.608887][ T3602] rtnetlink_rcv_msg+0x413/0xb80 [ 65.613811][ T3602] ? rtnl_newlink+0xa0/0xa0 [ 65.618317][ T3602] netlink_rcv_skb+0x153/0x420 [ 65.623068][ T3602] ? rtnl_newlink+0xa0/0xa0 [ 65.627558][ T3602] ? netlink_ack+0xa60/0xa60 [ 65.632134][ T3602] ? netlink_deliver_tap+0x1a2/0xc30 [ 65.637451][ T3602] ? netlink_deliver_tap+0x1b1/0xc30 [ 65.642721][ T3602] ? _copy_from_iter+0x12b/0x1320 [ 65.647733][ T3602] netlink_unicast+0x533/0x7d0 [ 65.652486][ T3602] ? netlink_attachskb+0x880/0x880 [ 65.657584][ T3602] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 65.663815][ T3602] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 65.670099][ T3602] ? __phys_addr_symbol+0x2c/0x70 [ 65.675105][ T3602] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 65.680810][ T3602] ? __check_object_size+0x16e/0x3f0 [ 65.686084][ T3602] netlink_sendmsg+0x904/0xdf0 [ 65.690845][ T3602] ? netlink_unicast+0x7d0/0x7d0 [ 65.695772][ T3602] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 65.701997][ T3602] ? netlink_unicast+0x7d0/0x7d0 [ 65.706921][ T3602] sock_sendmsg+0xcf/0x120 [ 65.711321][ T3602] ____sys_sendmsg+0x6e8/0x810 [ 65.716068][ T3602] ? kernel_sendmsg+0x50/0x50 [ 65.720727][ T3602] ? do_recvmmsg+0x6d0/0x6d0 [ 65.725301][ T3602] ? do_huge_pmd_anonymous_page+0x12c4/0x2840 [ 65.731354][ T3602] ? lock_downgrade+0x6e0/0x6e0 [ 65.736194][ T3602] ___sys_sendmsg+0xf3/0x170 [ 65.740765][ T3602] ? sendmsg_copy_msghdr+0x160/0x160 [ 65.746033][ T3602] ? __lock_acquire+0x162f/0x54a0 [ 65.751088][ T3602] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 65.757071][ T3602] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 65.763051][ T3602] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 65.769280][ T3602] ? __fget_light+0x215/0x280 [ 65.773952][ T3602] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 65.780190][ T3602] __sys_sendmsg+0xe5/0x1b0 [ 65.784676][ T3602] ? __sys_sendmsg_sock+0x30/0x30 [ 65.789689][ T3602] ? syscall_enter_from_user_mode+0x21/0x70 [ 65.795569][ T3602] do_syscall_64+0x35/0xb0 [ 65.799972][ T3602] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 65.805864][ T3602] RIP: 0033:0x7f896932b2a9 [ 65.810266][ T3602] 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 [ 65.829866][ T3602] RSP: 002b:00007ffeff6cc4d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 65.838268][ T3602] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f896932b2a9 [ 65.846226][ T3602] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 65.854181]