============================= WARNING: suspicious RCU usage 4.18.0+ #79 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-executor5/8620: #0: 000000007ce50f4b (&ctx->mutex){+.+.}, at: perf_event_ctx_lock_nested+0x375/0x600 kernel/events/core.c:1276 #1: 0000000083beda7a (bpf_event_mutex){+.+.}, at: perf_event_query_prog_array+0x1c6/0x380 kernel/trace/bpf_trace.c:1062 stack backtrace: CPU: 1 PID: 8620 Comm: syz-executor5 Not tainted 4.18.0+ #79 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:4562 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:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 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:00007f3e49cc7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3e49cc86d4 RCX: 0000000000457089 RDX: 00000000200003c0 RSI: 00000000c008240a RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cf478 R14: 00000000004bead0 R15: 0000000000000000 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 protocol 88a8 is buggy, dev gre0 netlink: 7 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 7 bytes leftover after parsing attributes in process `syz-executor3'. sctp: [Deprecated]: syz-executor4 (pid 8874) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 8877) Use of int in maxseg socket option. Use struct sctp_assoc_value instead IPv6: ADDRCONF(NETDEV_UP): nr0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready netlink: 3302 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3302 bytes leftover after parsing attributes in process `syz-executor6'. À: renamed from team0 gretap0: refused to change device tx_queue_len gretap0: refused to change device tx_queue_len device nr0 entered promiscuous mode syz_tun: refused to change device tx_queue_len syz_tun: refused to change device tx_queue_len device nr0 entered promiscuous mode