============================= 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.0/11168: #0: ffff8880944135d8 (nlk_cb_mutex-NETFILTER){+.+.}, at: netlink_dump+0xe7/0xfb0 net/netlink/af_netlink.c:2199 stack backtrace: CPU: 1 PID: 11168 Comm: syz-executor.0 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:5435 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_recvfrom+0x1ff/0x350 net/socket.c:2042 __compat_sys_recvfrom net/compat.c:685 [inline] __do_compat_sys_recvfrom net/compat.c:698 [inline] __se_compat_sys_recvfrom net/compat.c:694 [inline] __ia32_compat_sys_recvfrom+0xe5/0x1a0 net/compat.c:694 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f62a39 Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7f5e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000173 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 00000000c68970de RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000226 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000