Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.936506][ T6892] netlink: 'syz-executor988': attribute type 2 has an invalid length. [ 62.949905][ T6892] device  entered promiscuous mode [ 62.958004][ T6892] [ 62.960476][ T6892] ============================= [ 62.966344][ T6892] WARNING: suspicious RCU usage [ 62.971227][ T6892] 5.8.0-rc7-syzkaller #0 Not tainted [ 62.990029][ T6892] ----------------------------- [ 62.996092][ T6892] net/openvswitch/flow_table.c:940 suspicious rcu_dereference_check() usage! [ 63.007926][ T6892] [ 63.007926][ T6892] other info that might help us debug this: [ 63.007926][ T6892] [ 63.018892][ T6892] [ 63.018892][ T6892] rcu_scheduler_active = 2, debug_locks = 1 [ 63.030535][ T6892] 2 locks held by syz-executor988/6892: [ 63.036973][ T6892] #0: ffffffff8a832390 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 63.096159][ T6892] #1: ffffffff8aa792e8 (ovs_mutex){+.+.}-{3:3}, at: ovs_dp_cmd_new+0x4db/0xea0 [ 63.106738][ T6892] [ 63.106738][ T6892] stack backtrace: [ 63.113157][ T6892] CPU: 1 PID: 6892 Comm: syz-executor988 Not tainted 5.8.0-rc7-syzkaller #0 [ 63.121824][ T6892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.131881][ T6892] Call Trace: [ 63.135162][ T6892] dump_stack+0x18f/0x20d [ 63.139492][ T6892] ovs_flow_tbl_masks_cache_size+0xc3/0xe0 [ 63.145312][ T6892] ovs_dp_cmd_fill_info+0x4e4/0x880 [ 63.150562][ T6892] ? dev_set_promiscuity+0xcb/0x100 [ 63.155946][ T6892] ? trace_hardirqs_on+0x5f/0x220 [ 63.160983][ T6892] ? ovs_vport_cmd_fill_info+0x620/0x620 [ 63.166606][ T6892] ? dev_set_promiscuity+0xcb/0x100 [ 63.171801][ T6892] ? __local_bh_enable_ip+0x159/0x250 [ 63.177794][ T6892] ? hash_bucket+0x4de/0x5f0 [ 63.182393][ T6892] ? ovs_vport_add+0x28c/0x4c0 [ 63.187232][ T6892] ovs_dp_cmd_new+0x584/0xea0 [ 63.191908][ T6892] ? ovs_vport_cmd_new+0xc60/0xc60 [ 63.197011][ T6892] ? genl_family_rcv_msg_attrs_parse.isra.0+0x19a/0x250 [ 63.203956][ T6892] ? genl_family_rcv_msg_attrs_parse.isra.0+0x8d/0x250 [ 63.210817][ T6892] genl_rcv_msg+0x61d/0x980 [ 63.215309][ T6892] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 63.222234][ T6892] ? lock_release+0x8d0/0x8d0 [ 63.227026][ T6892] netlink_rcv_skb+0x15a/0x430 [ 63.231788][ T6892] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 63.238731][ T6892] ? netlink_ack+0xa10/0xa10 [ 63.243318][ T6892] genl_rcv+0x24/0x40 [ 63.247285][ T6892] netlink_unicast+0x533/0x7d0 [ 63.252049][ T6892] ? netlink_attachskb+0x810/0x810 [ 63.257167][ T6892] ? _copy_from_iter_full+0x247/0x890 [ 63.262552][ T6892] ? __phys_addr+0x9a/0x110 [ 63.267060][ T6892] ? __phys_addr_symbol+0x2c/0x70 [ 63.272087][ T6892] ? __check_object_size+0x171/0x3e4 [ 63.277367][ T6892] netlink_sendmsg+0x856/0xd90 [ 63.282117][ T6892] ? netlink_unicast+0x7d0/0x7d0 [ 63.287049][ T6892] ? netlink_unicast+0x7d0/0x7d0 [ 63.291973][ T6892] sock_sendmsg+0xcf/0x120 [ 63.296391][ T6892] ____sys_sendmsg+0x6e8/0x810 [ 63.301137][ T6892] ? kernel_sendmsg+0x50/0x50 [ 63.305824][ T6892] ? do_recvmmsg+0x6d0/0x6d0 [ 63.310405][ T6892] ? lock_acquire+0x1f1/0xad0 [ 63.315066][ T6892] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 63.321119][ T6892] ? find_held_lock+0x2d/0x110 [ 63.325865][ T6892] ___sys_sendmsg+0xf3/0x170 [ 63.330452][ T6892] ? sendmsg_copy_msghdr+0x160/0x160 [ 63.335734][ T6892] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 63.341700][ T6892] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 63.347665][ T6892] ? handle_mm_fault+0xad9/0x43f0 [ 63.352706][ T6892] ? find_held_lock+0x2d/0x110 [ 63.357606][ T6892] ? __fget_light+0x215/0x280 [ 63.362286][ T6892] __sys_sendmsg+0xe5/0x1b0 [ 63.366860][ T6892] ? __sys_sendmsg_sock+0xb0/0xb0 [ 63.371870][ T6892] ? do_syscall_64+0x1c/0xe0 [ 63.376450][ T6892] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 63.382431][ T6892] do_syscall_64+0x60/0xe0 [ 63.386845][ T6892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.392733][ T6892] RIP: 0033:0x4402d9 [ 63.396610][ T6892] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.416210][ T6892] RSP: 002b:00007ffd1247e9a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 63.424608][ T6892] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402d9 [ 63.432568][ T6892] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 63.440592][ T6892] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8