netlink: 'syz-executor4': attribute type 21 has an invalid length. ================================ WARNING: inconsistent lock state 4.18.0-next-20180815+ #40 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. syz-executor5/18155 [HC0[0]:SC0[0]:HE1:SE1] takes: 00000000c7248bb7 (&(&tlocks[i])->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000c7248bb7 (&(&tlocks[i])->rlock){+.?.}, at: ila_del_mapping net/ipv6/ila/ila_xlat.c:290 [inline] 00000000c7248bb7 (&(&tlocks[i])->rlock){+.?.}, at: ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 net/ipv6/ila/ila_xlat.c:368 {IN-SOFTIRQ-W} state was registered at: netlink: 'syz-executor4': attribute type 4 has an invalid length. lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 netlink: 'syz-executor4': attribute type 21 has an invalid length. __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] __rhashtable_insert_fast include/linux/rhashtable.h:596 [inline] rhashtable_lookup_insert_fast include/linux/rhashtable.h:784 [inline] fdb_create+0x5cc/0x1710 net/bridge/br_fdb.c:508 br_fdb_update+0x4e7/0xc40 net/bridge/br_fdb.c:605 br_handle_frame_finish+0xa23/0x1960 net/bridge/br_input.c:97 netlink: 'syz-executor4': attribute type 4 has an invalid length. br_nf_hook_thresh+0x48d/0x5f0 net/bridge/br_netfilter_hooks.c:1011 br_nf_pre_routing_finish_ipv6+0x7bc/0xef0 net/bridge/br_netfilter_ipv6.c:209 NF_HOOK include/linux/netfilter.h:287 [inline] br_nf_pre_routing_ipv6+0x4af/0xac0 net/bridge/br_netfilter_ipv6.c:237 br_nf_pre_routing+0xb33/0x17d0 net/bridge/br_netfilter_hooks.c:494 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xc2/0x1c0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:242 [inline] NF_HOOK include/linux/netfilter.h:285 [inline] br_handle_frame+0xc0d/0x1a20 net/bridge/br_input.c:303 __netif_receive_skb_core+0x134b/0x39f0 net/core/dev.c:4821 __netif_receive_skb_one_core+0xd0/0x200 net/core/dev.c:4890 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5002 process_backlog+0x219/0x760 net/core/dev.c:5808 napi_poll net/core/dev.c:6228 [inline] net_rx_action+0x799/0x1900 net/core/dev.c:6294 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292 run_ksoftirqd+0x88/0x100 kernel/softirq.c:653 smpboot_thread_fn+0x425/0x880 kernel/smpboot.c:164 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 irq event stamp: 119 hardirqs last enabled at (119): [] queue_work_on+0xe8/0x1e0 kernel/workqueue.c:1490 hardirqs last disabled at (118): [] queue_work_on+0x9f/0x1e0 kernel/workqueue.c:1483 softirqs last enabled at (116): [] __do_softirq+0x74d/0xa74 kernel/softirq.c:318 softirqs last disabled at (89): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (89): [] irq_exit+0x1d6/0x210 kernel/softirq.c:412 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&tlocks[i])->rlock); lock(&(&tlocks[i])->rlock); *** DEADLOCK *** 1 lock held by syz-executor5/18155: #0: 00000000c5ce76b0 (cb_lock){++++}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:636 stack backtrace: CPU: 0 PID: 18155 Comm: syz-executor5 Not tainted 4.18.0-next-20180815+ #40 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_usage_bug.cold.60+0x320/0x41a kernel/locking/lockdep.c:2541 valid_state kernel/locking/lockdep.c:2554 [inline] mark_lock_irq kernel/locking/lockdep.c:2748 [inline] mark_lock+0x1048/0x19f0 kernel/locking/lockdep.c:3128 mark_irqflags kernel/locking/lockdep.c:3024 [inline] __lock_acquire+0x7ca/0x5020 kernel/locking/lockdep.c:3369 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] ila_del_mapping net/ipv6/ila/ila_xlat.c:290 [inline] ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 net/ipv6/ila/ila_xlat.c:368 genl_family_rcv_msg+0x8a3/0x1140 net/netlink/genetlink.c:601 genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454 genl_rcv+0x28/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:632 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2115 __sys_sendmsg+0x11d/0x290 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9651bc7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9651bc86d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4088 R14: 00000000004c8ab0 R15: 0000000000000000 netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 4 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 4 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 4 has an invalid length. validate_nla: 18 callbacks suppressed netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length. netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length. netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length. netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length. netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length.