netlink: 16 bytes leftover after parsing attributes in process `syz.3.2510'. netlink: 24 bytes leftover after parsing attributes in process `syz.3.2510'. ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- net/mac80211/iface.c:378 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.3.2510/15509: #0: ffffffff8f3e8208 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline] #0: ffffffff8f3e8208 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ed/0xf90 net/core/rtnetlink.c:6486 stack backtrace: CPU: 1 PID: 15509 Comm: syz.3.2510 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x1e1/0x300 kernel/locking/lockdep.c:6767 ieee80211_check_concurrent_iface+0x46b/0x950 net/mac80211/iface.c:378 ieee80211_open+0xc1/0x200 net/mac80211/iface.c:466 __dev_open+0x2cb/0x430 net/core/dev.c:1519 __dev_change_flags+0x1e8/0x6a0 net/core/dev.c:8787 dev_change_flags+0x7c/0x1a0 net/core/dev.c:8859 do_setlink+0xc1f/0x3f00 net/core/rtnetlink.c:2922 __rtnl_newlink net/core/rtnetlink.c:3720 [inline] rtnl_newlink+0x1848/0x2170 net/core/rtnetlink.c:3767 rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6489 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x61b/0x980 net/socket.c:2595 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff5c9b9f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff5caaa2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff5c9e25fa0 RCX: 00007ff5c9b9f559 RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000000000000003 RBP: 00007ff5c9c36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff5c9e26038 R14: 00007ff5c9e25fa0 R15: 00007fff4eb35708