------------[ cut here ]------------
failed to allocate ring buffer on CPU 0
WARNING: kernel/trace/ring_buffer.c:7980 at trace_rb_cpu_prepare+0x330/0x3c0, CPU#1: syz.6.2207/16046
Modules linked in:
CPU: 1 UID: 0 PID: 16046 Comm: syz.6.2207 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:trace_rb_cpu_prepare+0x332/0x3c0
Code: 08 f0 48 0f ab 03 31 c0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 d7 3a fc ff 48 8d 3d 00 a6 90 0e 89 ee <67> 48 0f b9 3a b8 f4 ff ff ff eb d2 e8 bd 3a fc ff e9 ef fe ff ff
RSP: 0018:ffffc90004e077e0 EFLAGS: 00010293
RAX: ffffffff81cac689 RBX: dffffc0000000000 RCX: ffff8881703a1dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff905b6c90
RBP: 0000000000000000 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 0000000000000000
R13: ffff8881ba6efa00 R14: ffff88816c101ca8 R15: 0000000000000000
FS:  00007fa3baed86c0(0000) GS:ffff8882a8f55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18e2beb7c0 CR3: 00000001bbe0e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 cpuhp_invoke_callback+0x498/0x810
 cpuhp_issue_call+0x3f0/0x750
 __cpuhp_state_add_instance_cpuslocked+0x225/0x560
 __cpuhp_state_add_instance+0x25/0x40
 alloc_buffer+0x18aa/0x1d50
 __ring_buffer_alloc+0x2c/0x40
 allocate_trace_buffer+0x1d2/0x950
 trace_array_create_systems+0x590/0xe60
 instance_mkdir+0xd5/0x140
 tracefs_syscall_mkdir+0x11a/0x190
 vfs_mkdir+0x406/0x620
 filename_mkdirat+0x285/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa3b9f9e0d9
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:00007fa3baed8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fa3ba225fa0 RCX: 00007fa3b9f9e0d9
RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007fa3ba035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa3ba226038 R14: 00007fa3ba225fa0 R15: 00007ffed1bcddb8
 </TASK>
