Could not create tracefs 'set_event_pid' entry
Could not create tracefs 'set_event_notrace_pid' entry
------------[ cut here ]------------
!list_empty(&ei->children)
WARNING: fs/tracefs/event_inode.c:128 at free_ei+0x284/0x340 fs/tracefs/event_inode.c:128, CPU#1: syz.6.1068/9229
Modules linked in:
CPU: 1 UID: 0 PID: 9229 Comm: syz.6.1068 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:free_ei+0x284/0x340 fs/tracefs/event_inode.c:128
Code: 48 c7 c7 40 80 77 8e 48 89 de 48 c7 c2 90 a0 cf 83 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 32 69 da fd e8 ad 3f f6 fd 90 <0f> 0b 90 e9 c7 fd ff ff e8 9f 3f f6 fd 90 0f 0b 90 48 b8 00 00 00
RSP: 0018:ffffc90004cefa88 EFLAGS: 00010283
RAX: ffffffff83cfa423 RBX: ffff8880206ba710 RCX: 0000000000080000
RDX: ffffc9001f0a4000 RSI: 000000000007ecb4 RDI: 000000000007ecb5
RBP: ffff8880206ba700 R08: 00000000ffffffff R09: 1ffffffff1f5fba6
R10: dffffc0000000000 R11: fffffbfff1f5fba7 R12: 0000000000000000
R13: ffff88805d402800 R14: ffff8880206ba700 R15: 0000000000000003
FS:  00007f32944456c0(0000) GS:ffff888125d29000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33322ff8 CR3: 000000003c118000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 cleanup_ei fs/tracefs/event_inode.c:150 [inline]
 eventfs_create_events_dir+0x7c7/0xa00 fs/tracefs/event_inode.c:834
 create_event_toplevel_files+0x11e/0x1a0 kernel/trace/trace_events.c:4593
 event_trace_add_tracer+0x8a/0x3b0 kernel/trace/trace_events.c:4624
 trace_array_create_dir+0x77/0x160 kernel/trace/trace.c:8548
 trace_array_create_systems+0xb3c/0xe60 kernel/trace/trace.c:8639
 trace_array_create kernel/trace/trace.c:8666 [inline]
 instance_mkdir+0xd5/0x140 kernel/trace/trace.c:8681
 tracefs_syscall_mkdir+0x11a/0x190 fs/tracefs/inode.c:121
 vfs_mkdir+0x408/0x620 fs/namei.c:5410
 filename_mkdirat+0x289/0x520 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f329620e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3294445028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f3296496090 RCX: 00007f329620e0d9
RDX: 00000000000001ff RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f32962a5024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3296496128 R14: 00007f3296496090 R15: 00007fff8e0f7ab8
 </TASK>