Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.428960][ T6802] netlink: 'syz-executor399': attribute type 2 has an invalid length. [ 55.438150][ T6802] [ 55.440471][ T6802] ============================= [ 55.446460][ T6802] WARNING: suspicious RCU usage [ 55.451306][ T6802] 5.8.0-rc7-syzkaller #0 Not tainted [ 55.457319][ T6802] ----------------------------- [ 55.462181][ T6802] net/openvswitch/flow_table.c:521 suspicious rcu_dereference_check() usage! [ 55.471793][ T6802] [ 55.471793][ T6802] other info that might help us debug this: [ 55.471793][ T6802] [ 55.482660][ T6802] [ 55.482660][ T6802] rcu_scheduler_active = 2, debug_locks = 1 [ 55.491380][ T6802] 1 lock held by syz-executor399/6802: [ 55.497281][ T6802] #0: ffffffff8a8319b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 55.506005][ T6802] [ 55.506005][ T6802] stack backtrace: [ 55.511897][ T6802] CPU: 0 PID: 6802 Comm: syz-executor399 Not tainted 5.8.0-rc7-syzkaller #0 [ 55.520550][ T6802] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.530591][ T6802] Call Trace: [ 55.533875][ T6802] dump_stack+0x18f/0x20d [ 55.538188][ T6802] ovs_flow_tbl_destroy+0x1d6/0x210 [ 55.543385][ T6802] ovs_dp_cmd_new+0x8ca/0xea0 [ 55.548059][ T6802] ? ovs_vport_cmd_new+0xc60/0xc60 [ 55.553158][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x19a/0x250 [ 55.560070][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x8d/0x250 [ 55.566920][ T6802] genl_rcv_msg+0x61d/0x980 [ 55.571472][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 55.578397][ T6802] ? lock_release+0x8d0/0x8d0 [ 55.583068][ T6802] netlink_rcv_skb+0x15a/0x430 [ 55.587826][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 55.594739][ T6802] ? netlink_ack+0xa10/0xa10 [ 55.599316][ T6802] genl_rcv+0x24/0x40 [ 55.603319][ T6802] netlink_unicast+0x533/0x7d0 [ 55.608091][ T6802] ? netlink_attachskb+0x810/0x810 [ 55.613208][ T6802] ? _copy_from_iter_full+0x247/0x890 [ 55.618566][ T6802] ? __phys_addr+0x9a/0x110 [ 55.623066][ T6802] ? __phys_addr_symbol+0x2c/0x70 [ 55.628102][ T6802] ? __check_object_size+0x171/0x3e4 [ 55.633377][ T6802] netlink_sendmsg+0x856/0xd90 [ 55.638130][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 55.643069][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 55.647989][ T6802] sock_sendmsg+0xcf/0x120 [ 55.652398][ T6802] ____sys_sendmsg+0x6e8/0x810 [ 55.657152][ T6802] ? kernel_sendmsg+0x50/0x50 [ 55.661802][ T6802] ? do_recvmmsg+0x6d0/0x6d0 [ 55.666383][ T6802] ? lock_acquire+0x1f1/0xad0 [ 55.671039][ T6802] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 55.677092][ T6802] ? find_held_lock+0x2d/0x110 [ 55.681846][ T6802] ___sys_sendmsg+0xf3/0x170 [ 55.686421][ T6802] ? sendmsg_copy_msghdr+0x160/0x160 [ 55.691705][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.697669][ T6802] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 55.703637][ T6802] ? handle_mm_fault+0xad9/0x43f0 [ 55.708654][ T6802] ? find_held_lock+0x2d/0x110 [ 55.713394][ T6802] ? __fget_light+0x215/0x280 [ 55.718059][ T6802] __sys_sendmsg+0xe5/0x1b0 [ 55.722540][ T6802] ? __sys_sendmsg_sock+0xb0/0xb0 [ 55.727550][ T6802] ? do_syscall_64+0x1c/0xe0 [ 55.732119][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.738081][ T6802] do_syscall_64+0x60/0xe0 [ 55.742479][ T6802] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.748349][ T6802] RIP: 0033:0x4402d9 [ 55.752223][ T6802] 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 [ 55.771810][ T6802] RSP: 002b:00007ffdfda722f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 55.780216][ T6802] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402d9 [ 55.788175][ T6802] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 55.796146][ T6802] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.804107][ T6802] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ae0 [ 55.812066][ T6802] R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 [ 55.820353][ T6802] [ 55.822693][ T6802] ============================= [ 55.827639][ T6802] WARNING: suspicious RCU usage [ 55.832497][ T6802] 5.8.0-rc7-syzkaller #0 Not tainted [ 55.837900][ T6802] ----------------------------- [ 55.842754][ T6802] net/openvswitch/flow_table.c:522 suspicious rcu_dereference_check() usage! [ 55.851605][ T6802] [ 55.851605][ T6802] other info that might help us debug this: [ 55.851605][ T6802] [ 55.862047][ T6802] [ 55.862047][ T6802] rcu_scheduler_active = 2, debug_locks = 1 [ 55.870172][ T6802] 1 lock held by syz-executor399/6802: [ 55.875692][ T6802] #0: ffffffff8a8319b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 55.883911][ T6802] [ 55.883911][ T6802] stack backtrace: [ 55.889799][ T6802] CPU: 0 PID: 6802 Comm: syz-executor399 Not tainted 5.8.0-rc7-syzkaller #0 [ 55.898453][ T6802] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.908570][ T6802] Call Trace: [ 55.911852][ T6802] dump_stack+0x18f/0x20d [ 55.916179][ T6802] ovs_flow_tbl_destroy+0x190/0x210 [ 55.921365][ T6802] ovs_dp_cmd_new+0x8ca/0xea0 [ 55.926026][ T6802] ? ovs_vport_cmd_new+0xc60/0xc60 [ 55.931133][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x19a/0x250 [ 55.938061][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x8d/0x250 [ 55.944899][ T6802] genl_rcv_msg+0x61d/0x980 [ 55.949402][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 55.956321][ T6802] ? lock_release+0x8d0/0x8d0 [ 55.960979][ T6802] netlink_rcv_skb+0x15a/0x430 [ 55.965737][ T6802] ? genl_family_rcv_msg_attrs_parse.isra.0+0x250/0x250 [ 55.972660][ T6802] ? netlink_ack+0xa10/0xa10 [ 55.977248][ T6802] genl_rcv+0x24/0x40 [ 55.981216][ T6802] netlink_unicast+0x533/0x7d0 [ 55.985961][ T6802] ? netlink_attachskb+0x810/0x810 [ 55.991060][ T6802] ? _copy_from_iter_full+0x247/0x890 [ 55.996422][ T6802] ? __phys_addr+0x9a/0x110 [ 56.001617][ T6802] ? __phys_addr_symbol+0x2c/0x70 [ 56.006638][ T6802] ? __check_object_size+0x171/0x3e4 [ 56.011925][ T6802] netlink_sendmsg+0x856/0xd90 [ 56.016681][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 56.021612][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 56.026545][ T6802] sock_sendmsg+0xcf/0x120 [ 56.030974][ T6802] ____sys_sendmsg+0x6e8/0x810 [ 56.035808][ T6802] ? kernel_sendmsg+0x50/0x50 [ 56.040462][ T6802] ? do_recvmmsg+0x6d0/0x6d0 [ 56.045038][ T6802] ? lock_acquire+0x1f1/0xad0 [ 56.049692][ T6802] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 56.055751][ T6802] ? find_held_lock+0x2d/0x110 [ 56.060498][ T6802] ___sys_sendmsg+0xf3/0x170 [ 56.065214][ T6802] ? sendmsg_copy_msghdr+0x160/0x160 [ 56.070486][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.076450][ T6802] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 56.082420][ T6802] ? handle_mm_fault+0xad9/0x43f0 [ 56.087429][ T6802] ? find_held_lock+0x2d/0x110 [ 56.092171][ T6802] ? __fget_light+0x215/0x280 [ 56.096847][ T6802] __sys_sendmsg+0xe5/0x1b0 [ 56.101330][ T6802] ? __sys_sendmsg_sock+0xb0/0xb0 [ 56.106348][ T6802] ? do_syscall_64+0x1c/0xe0 [ 56.110935][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.116928][ T6802] do_syscall_64+0x60/0xe0 [ 56.121345][ T6802] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.127231][ T6802] RIP: 0033:0x4402d9 [ 56.131117][ T6802] 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 [ 56.150710][ T6802] RSP: 002b:00007ffdfda722f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 56.159125][ T6802] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402d9 [ 56.167132][ T6802] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 56.175093][ T6802] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000400