============================= WARNING: suspicious RCU usage 4.18.0-next-20180816+ #41 Not tainted ----------------------------- kernel/bpf/core.c:1582 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor2/21203: #0: 00000000e3018932 (&ctx->mutex){+.+.}, at: perf_event_ctx_lock_nested+0x375/0x600 kernel/events/core.c:1276 #1: 000000008232c6c3 (bpf_event_mutex){+.+.}, at: perf_event_query_prog_array+0x1c6/0x380 kernel/trace/bpf_trace.c:1062 stack backtrace: CPU: 0 PID: 21203 Comm: syz-executor2 Not tainted 4.18.0-next-20180816+ #41 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+0x1c9/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 bpf_prog_array_copy_core+0x2d9/0x360 kernel/bpf/core.c:1582 bpf_prog_array_copy_info+0x9a/0x110 kernel/bpf/core.c:1720 perf_event_query_prog_array+0x22e/0x380 kernel/trace/bpf_trace.c:1063 _perf_ioctl+0x986/0x1600 kernel/events/core.c:5079 perf_ioctl+0x59/0x80 kernel/events/core.c:5110 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7fcb3f2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7fcb3f36d4 RCX: 0000000000457089 RDX: 0000000020000200 RSI: 00000000c008240a RDI: 0000000000000006 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cf3a8 R14: 00000000004bead0 R15: 0000000000000000 Unknown ioctl 1077957454 kernel msg: ebtables bug: please report to author: Wrong nr of counters Unknown ioctl 1077957454 kernel msg: ebtables bug: please report to author: Wrong nr of counters nla_parse: 8 callbacks suppressed netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. binder: 21348:21354 ioctl 541b 20000380 returned -22 binder: 21348:21354 BC_FREE_BUFFER u55b7e25c0dd6a333 no match binder: 21348:21362 ioctl 541b 20000380 returned -22 binder: 21348:21362 BC_FREE_BUFFER u55b7e25c0dd6a333 no match netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. openvswitch: netlink: Flow actions attr not present in new flow. openvswitch: netlink: Flow actions attr not present in new flow. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. capability: warning: `syz-executor2' uses deprecated v2 capabilities in a way that may be insecure nla_parse: 9 callbacks suppressed netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor2': attribute type 17 has an invalid length. netlink: 'syz-executor2': attribute type 17 has an invalid length. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. IPVS: ftp: loaded support on port[0] = 21 netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. IPVS: ftp: loaded support on port[0] = 21 netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 663 bytes leftover after parsing attributes in process `syz-executor1'.