------------[ 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#0: syz.3.700/7816
Modules linked in:
CPU: 0 UID: 0 PID: 7816 Comm: syz.3.700 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 60 5a 78 8e 48 89 de 48 c7 c2 b0 6d d5 83 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 a2 8d d4 fd e8 6d 8c f0 fd 90 <0f> 0b 90 e9 c7 fd ff ff e8 5f 8c f0 fd 90 0f 0b 90 48 b8 00 00 00
RSP: 0018:ffffc90003937a88 EFLAGS: 00010283
RAX: ffffffff83d57143 RBX: ffff88803a610d90 RCX: 0000000000080000
RDX: ffffc9000fc8e000 RSI: 00000000000313e8 RDI: 00000000000313e9
RBP: ffff88803a610d80 R08: 00000000ffffffff R09: 1ffffffff1f636a7
R10: dffffc0000000000 R11: fffffbfff1f636a8 R12: 0000000000000000
R13: ffff888038f66800 R14: ffff88803a610d80 R15: 0000000000000003
FS:  00007fad5add56c0(0000) GS:ffff888125be8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30c122 CR3: 000000005f782000 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:838
 create_event_toplevel_files+0x11e/0x1a0 kernel/trace/trace_events.c:4709
 event_trace_add_tracer+0x8a/0x3b0 kernel/trace/trace_events.c:4740
 trace_array_create_dir+0x77/0x160 kernel/trace/trace.c:8550
 trace_array_create_systems+0xb3c/0xe60 kernel/trace/trace.c:8641
 trace_array_create kernel/trace/trace.c:8668 [inline]
 instance_mkdir+0xd5/0x140 kernel/trace/trace.c:8683
 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: 0033:0x7fad5cb9e0d9
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:00007fad5add5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fad5ce26090 RCX: 00007fad5cb9e0d9
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007fad5cc35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fad5ce26128 R14: 00007fad5ce26090 R15: 00007ffe5c7df748
 </TASK>