============================= WARNING: suspicious RCU usage 5.5.0-rc6-syzkaller #0 Not tainted ----------------------------- net/netfilter/ipset/ip_set_core.c:1001 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-executor.5/13236: #0: ffff8880684965d8 (nlk_cb_mutex-NETFILTER){+.+.}, at: netlink_dump+0xe7/0xfb0 net/netlink/af_netlink.c:2199 stack backtrace: CPU: 1 PID: 13236 Comm: syz-executor.5 Not tainted 5.5.0-rc6-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:5434 find_set_and_id.isra.0+0x227/0x330 net/netfilter/ipset/ip_set_core.c:1001 dump_init+0x1c1/0x3b0 net/netfilter/ipset/ip_set_core.c:1506 ip_set_dump_start+0x9e6/0x1ca0 net/netfilter/ipset/ip_set_core.c:1541 netlink_dump+0x558/0xfb0 net/netlink/af_netlink.c:2244 netlink_recvmsg+0xbb4/0xf50 net/netlink/af_netlink.c:2000 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg net/socket.c:891 [inline] sock_recvmsg+0xce/0x110 net/socket.c:887 ____sys_recvmsg+0x22c/0x5f0 net/socket.c:2553 ___sys_recvmsg+0xe4/0x150 net/socket.c:2595 do_recvmmsg+0x27e/0x7a0 net/socket.c:2693 __sys_recvmmsg+0xe5/0x270 net/socket.c:2774 __do_sys_recvmmsg net/socket.c:2795 [inline] __se_sys_recvmmsg net/socket.c:2788 [inline] __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2788 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1a92c8cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f1a92c8d6d4 RCX: 000000000045b349 RDX: 00000000000004a5 RSI: 00000000200013c0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000020000c40 R09: 0000000000000000 R10: 0000000000200002 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000086c R14: 00000000004c9d4a R15: 000000000075bf2c