============================= WARNING: suspicious RCU usage 6.8.0-rc5-syzkaller #0 Not tainted ----------------------------- net/ipv6/addrconf.c:5317 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor.0/2802: #0: ffff8881125e2670 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: __netlink_dump_start+0x76/0x2d0 net/netlink/af_netlink.c:2340 #1: ffffffff835045f8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0x1af/0x380 net/netlink/af_netlink.c:2267 #2: ffff888112f4d580 (&ndev->lock){++..}-{2:2}, at: in6_dump_addrs+0x3c/0x720 net/ipv6/addrconf.c:5279 stack backtrace: CPU: 0 PID: 2802 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xe0 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x15d/0x1b0 kernel/locking/lockdep.c:6712 in6_dump_addrs+0x715/0x720 net/ipv6/addrconf.c:5317 inet6_dump_addr+0x61d/0x690 net/ipv6/addrconf.c:5428 netlink_dump+0x1bf/0x380 net/netlink/af_netlink.c:2268 __netlink_dump_start+0x25b/0x2d0 net/netlink/af_netlink.c:2376 netlink_dump_start include/linux/netlink.h:340 [inline] rtnetlink_rcv_msg+0x64a/0x690 net/core/rtnetlink.c:6555 netlink_rcv_skb+0xe0/0x110 net/netlink/af_netlink.c:2549 netlink_unicast_kernel net/netlink/af_netlink.c:1337 [inline] netlink_unicast+0x245/0x330 net/netlink/af_netlink.c:1363 netlink_sendmsg+0x3ad/0x450 net/netlink/af_netlink.c:1904 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x8e/0xb0 net/socket.c:745 ____sys_sendmsg+0x1a7/0x200 net/socket.c:2584 ___sys_sendmsg+0x28f/0x2d0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [inline] __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg+0xf7/0x140 net/socket.c:2674 do_syscall_64+0xa7/0x1c0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f66b2eb4da9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f66b2a360c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f66b2fe2f80 RCX: 00007f66b2eb4da9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007f66b2f0147a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f66b2fe2f80 R15: 00007ffea91435d8