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Reader on commit with 928 missed events
WARNING: kernel/trace/ring_buffer.c:8033 at ring_buffer_map_get_reader+0x70e/0x930 kernel/trace/ring_buffer.c:8033, CPU#3: syz.6.3196/13745
Modules linked in:
CPU: 3 UID: 0 PID: 13745 Comm: syz.6.3196 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:ring_buffer_map_get_reader+0x711/0x930 kernel/trace/ring_buffer.c:8033
Code: 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 00 4c 3b a3 a8 00 00 00 0f 85 a5 72 12 ff e8 49 85 fb ff 48 8d 3d f2 6f 38 0f 4c 89 fe <67> 48 0f b9 3a e9 fb fc ff ff 4c 8b 74 24 58 4c 8b 7c 24 60 e9 cc
RSP: 0018:ffffc9000ca67d98 EFLAGS: 00010087
RAX: 00000000000007ed RBX: ffff88801c0e5000 RCX: ffffc9000c001000
RDX: 0000000000080000 RSI: 00000000000003a0 RDI: ffffffff91493480
RBP: ffff88805f5d8c80 R08: 0000000000000007 R09: 0000000000000000
R10: 00000000000003a0 R11: ffff88801c0e50b0 R12: ffff88805f5d8c80
R13: dffffc0000000000 R14: ffff88801c0e50b0 R15: 00000000000003a0
FS:  00007f83025b36c0(0000) GS:ffff8880d5e4e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e112ff8 CR3: 0000000037757000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 tracing_buffers_ioctl+0x2e6/0x3d0 kernel/trace/trace.c:7381
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f830179e159
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:00007f83025b3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8301a25fa0 RCX: 00007f830179e159
RDX: 0000000000000000 RSI: 0000000000005220 RDI: 0000000000000004
RBP: 00007f830183506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8301a26038 R14: 00007f8301a25fa0 R15: 00007ffd1a290728
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 2b 02 00 00    	jne    0x239
   e:	4c 3b a3 a8 00 00 00 	cmp    0xa8(%rbx),%r12
  15:	0f 85 a5 72 12 ff    	jne    0xff1272c0
  1b:	e8 49 85 fb ff       	call   0xfffb8569
  20:	48 8d 3d f2 6f 38 0f 	lea    0xf386ff2(%rip),%rdi        # 0xf387019
  27:	4c 89 fe             	mov    %r15,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 fb fc ff ff       	jmp    0xfffffd2f
  34:	4c 8b 74 24 58       	mov    0x58(%rsp),%r14
  39:	4c 8b 7c 24 60       	mov    0x60(%rsp),%r15
  3e:	e9                   	.byte 0xe9
  3f:	cc                   	int3