------------[ cut here ]------------
!reader
WARNING: kernel/trace/ring_buffer.c:7363 at ring_buffer_map_get_reader+0x659/0x880 kernel/trace/ring_buffer.c:7363, CPU#1: syz.2.1834/14309
Modules linked in:
CPU: 1 UID: 0 PID: 14309 Comm: syz.2.1834 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ring_buffer_map_get_reader+0x659/0x880 kernel/trace/ring_buffer.c:7363
Code: ff e8 4b e1 fb ff 48 8d 3d b4 da b0 0e 4c 89 fe 67 48 0f b9 3a e9 e0 fc ff ff 4c 8b 7c 24 58 4c 8b 74 24 60 e8 28 e1 fb ff 90 <0f> 0b 90 e8 1f e1 fb ff 48 89 df 31 db e8 85 13 fe ff 48 8b 74 24
RSP: 0018:ffffc9000ac27d98 EFLAGS: 00010087
RAX: 0000000000000814 RBX: ffff88813fe28800 RCX: ffffc9000d50f000
RDX: 0000000000080000 RSI: ffffffff820a6958 RDI: ffff888021ea3d00
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88813fe288b0 R12: ffff88813fe288b0
R13: dffffc0000000000 R14: ffff88813fe28990 R15: ffff88813fe28818
FS:  00007fd77880a6c0(0000) GS:ffff8881246e3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30ffdff8 CR3: 0000000025b5e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tracing_buffers_ioctl+0x30d/0x400 kernel/trace/trace.c:8938
 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:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd77799aeb9
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:00007fd77880a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd777c16090 RCX: 00007fd77799aeb9
RDX: 0000000000000000 RSI: 0000000000005220 RDI: 0000000000000005
RBP: 00007fd777a08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd777c16128 R14: 00007fd777c16090 R15: 00007ffcb66fb468
 </TASK>