------------[ cut here ]------------
failed to allocate ring buffer on CPU 1
WARNING: kernel/trace/ring_buffer.c:8095 at trace_rb_cpu_prepare+0x330/0x3c0 kernel/trace/ring_buffer.c:8094, CPU#0: syz.4.186/6443
Modules linked in:
CPU: 0 UID: 0 PID: 6443 Comm: syz.4.186 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:trace_rb_cpu_prepare+0x332/0x3c0 kernel/trace/ring_buffer.c:8094
Code: 08 f0 48 0f ab 03 31 c0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3d aa ac 09 cc e8 e7 29 fc ff 48 8d 3d b0 99 0d 0f 89 ee <67> 48 0f b9 3a b8 f4 ff ff ff eb d2 e8 cd 29 fc ff e9 ef fe ff ff
RSP: 0018:ffffc900065b77b0 EFLAGS: 00010287
RAX: ffffffff81cbaea9 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90007411000 RSI: 0000000000000001 RDI: ffffffff90d94860
RBP: 0000000000000001 R08: ffffffff90d596bf R09: 1ffffffff21ab2d7
R10: dffffc0000000000 R11: fffffbfff21ab2d8 R12: 0000000000000000
R13: ffff88804ed18f08 R14: ffff88803555c8a0 R15: 0000000000000000
FS:  00007f2fc26466c0(0000) GS:ffff888124715000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbee3bd56c8 CR3: 0000000025cc0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 cpuhp_invoke_callback+0x498/0x810 kernel/cpu.c:204
 cpuhp_issue_call+0x3f0/0x750 kernel/cpu.c:-1
 __cpuhp_state_add_instance_cpuslocked+0x225/0x560 kernel/cpu.c:2423
 __cpuhp_state_add_instance+0x25/0x40 kernel/cpu.c:2444
 cpuhp_state_add_instance include/linux/cpuhotplug.h:377 [inline]
 alloc_buffer+0x188f/0x1d70 kernel/trace/ring_buffer.c:2922
 __ring_buffer_alloc+0x2c/0x40 kernel/trace/ring_buffer.c:2964
 allocate_trace_buffer+0x1d2/0x950 kernel/trace/trace.c:8535
 allocate_trace_buffers kernel/trace/trace.c:8568 [inline]
 trace_array_create_systems+0x590/0xe60 kernel/trace/trace.c:8746
 trace_array_create kernel/trace/trace.c:8789 [inline]
 instance_mkdir+0xd5/0x140 kernel/trace/trace.c:8804
 tracefs_syscall_mkdir+0x11a/0x190 fs/tracefs/inode.c:121
 vfs_mkdir+0x417/0x670 fs/namei.c:5428
 filename_mkdirat+0x288/0x560 fs/namei.c:5461
 __do_sys_mkdirat fs/namei.c:5482 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479
 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: 0033:0x7f2fc43efb19
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:00007f2fc2646028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2fc4675fa0 RCX: 00007f2fc43efb19
RDX: 0000000000000000 RSI: 0000200000001500 RDI: ffffffffffffff9c
RBP: 00007f2fc4487b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fc4676038 R14: 00007f2fc4675fa0 R15: 00007ffdd70e74a8
 </TASK>
----------------
Code disassembly (best guess):
   0:	08 f0                	or     %dh,%al
   2:	48 0f ab 03          	bts    %rax,(%rbx)
   6:	31 c0                	xor    %eax,%eax
   8:	48 83 c4 30          	add    $0x30,%rsp
   c:	5b                   	pop    %rbx
   d:	41 5c                	pop    %r12
   f:	41 5d                	pop    %r13
  11:	41 5e                	pop    %r14
  13:	41 5f                	pop    %r15
  15:	5d                   	pop    %rbp
  16:	e9 3d aa ac 09       	jmp    0x9acaa58
  1b:	cc                   	int3
  1c:	e8 e7 29 fc ff       	call   0xfffc2a08
  21:	48 8d 3d b0 99 0d 0f 	lea    0xf0d99b0(%rip),%rdi        # 0xf0d99d8
  28:	89 ee                	mov    %ebp,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	b8 f4 ff ff ff       	mov    $0xfffffff4,%eax
  34:	eb d2                	jmp    0x8
  36:	e8 cd 29 fc ff       	call   0xfffc2a08
  3b:	e9 ef fe ff ff       	jmp    0xffffff2f