============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- net/xfrm/xfrm_user.c:1630 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz.3.2432/12990: #0: ffff88807dd74390 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: xfrm_netlink_rcv+0x62/0x90 net/xfrm/xfrm_user.c:3928 stack backtrace: CPU: 1 UID: 0 PID: 12990 Comm: syz.3.2432 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 lockdep_rcu_suspicious.cold+0x4f/0xb1 kernel/locking/lockdep.c:6876 xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1630 [inline] xfrm_send_migrate_state net/xfrm/xfrm_user.c:3340 [inline] xfrm_do_migrate_state+0x2463/0x2f10 net/xfrm/xfrm_user.c:3507 xfrm_user_rcv_msg+0x483/0xd80 net/xfrm/xfrm_user.c:3907 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3929 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738 __sys_sendmsg+0x160/0x210 net/socket.c:2770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f38b819de99 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:00007f38b9048028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f38b8426090 RCX: 00007f38b819de99 RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000003 RBP: 00007f38b8233eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f38b8426128 R14: 00007f38b8426090 R15: 00007fff66025e18