============================= 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-executor1/9462: #0: 00000000b96b3f62 (&ctx->mutex){+.+.}, at: perf_event_ctx_lock_nested+0x375/0x600 kernel/events/core.c:1276 #1: 000000000e93c03a (bpf_event_mutex){+.+.}, at: perf_event_query_prog_array+0x1c6/0x380 kernel/trace/bpf_trace.c:1062 stack backtrace: CPU: 1 PID: 9462 Comm: syz-executor1 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:00007f3bb8127c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3bb81286d4 RCX: 0000000000457089 RDX: 0000000020000240 RSI: 00000000c008240a RDI: 0000000000000004 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cf478 R14: 00000000004bead0 R15: 0000000000000000 EXT4-fs (sda1): Unrecognized mount option "zڰ bC"hWi">%"y`E>mH=H2sǭm `8(J1g"ONYT @h}Zϯs}32gJ9s[:k_us\RaR P6ڪ*1&?89l6Xx:*MY'5Fl-#2 X'3lfR8f|BɣI HeMPdAiId0Ij io~˷d#V vcYcuۈ' Lpڠɡcp|W.$%gSjH9"\؋B&rkC> R#}Sm~L>7R1:+#9np .ɒ<poweFP+D'ẛjH7m\ oQ6ZIcbXSUF ? EXT4-fs (sda1): Unrecognized mount option "zڰ bC"hWi">%"y`E>mH=H2sǭm `8(J1g"ONYT @h}Zϯs}32gJ9s[:k_us\RaR P6ڪ*1&?89l6Xx:*MY'5Fl-#2 X'3lfR8f|BɣI HeMPdAiId0Ij io~˷d#V vcYcuۈ' Lpڠɡcp|W.$%gSjH9"\؋B&rkC> R#}Sm~L>7R1:+#9np .ɒ<poweFP+D'ẛjH7m\ oQ6ZIcbXSUF ? device nr0 entered promiscuous mode net_ratelimit: 2587 callbacks suppressed ip6tnl0: mtu less than device minimum EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: device lo entered promiscuous mode EXT4-fs (sda1): resizing filesystem from 524032 to 64 blocks EXT4-fs warning (device sda1): ext4_resize_fs:1929: can't shrink FS - resize aborted EXT4-fs (sda1): resizing filesystem from 524032 to 64 blocks EXT4-fs warning (device sda1): ext4_resize_fs:1929: can't shrink FS - resize aborted netlink: 3302 bytes leftover after parsing attributes in process `syz-executor4'. tc_dump_action: action bad kind gretap0: refused to change device tx_queue_len gretap0: refused to change device tx_queue_len netlink: 3302 bytes leftover after parsing attributes in process `syz-executor4'. tc_dump_action: action bad kind