syzbot

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!reader
WARNING: kernel/trace/ring_buffer.c:7407 at ring_buffer_map_get_reader+0x659/0x880 kernel/trace/ring_buffer.c:7407, CPU#0: syz.2.4994/26622
Modules linked in:
CPU: 0 UID: 0 PID: 26622 Comm: syz.2.4994 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:ring_buffer_map_get_reader+0x659/0x880 kernel/trace/ring_buffer.c:7407
Code: ff e8 5b d5 fb ff 48 8d 3d 54 75 d1 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 38 d5 fb ff 90 <0f> 0b 90 e8 2f d5 fb ff 48 89 df 31 db e8 25 10 fe ff 48 8b 74 24
RSP: 0018:ffffc90004c5fd90 EFLAGS: 00010087
RAX: 0000000000000787 RBX: ffff88813fea5000 RCX: ffffc90015f19000
RDX: 0000000000080000 RSI: ffffffff820c6f68 RDI: ffff8880275c9e80
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88813fea50b0 R12: ffff88813fea50b0
R13: dffffc0000000000 R14: ffff88813fea5190 R15: ffff88813fea5018
FS:  00007f7897fd56c0(0000) GS:ffff888124340000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b336feff8 CR3: 000000008f236000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tracing_buffers_ioctl+0x30d/0x400 kernel/trace/trace.c:8175
 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7899d9c819
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:00007f7897fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f789a016090 RCX: 00007f7899d9c819
RDX: 0000000000000000 RSI: 0000000000005220 RDI: 0000000000000005
RBP: 00007f7899e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f789a016128 R14: 00007f789a016090 R15: 00007ffc5b2bf3f8
 </TASK>