------------[ cut here ]------------
WARNING: CPU: 1 PID: 28 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 1 UID: 0 PID: 28 Comm: rcuc/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 80 d4 b2 98 be 04 00 00 00 e8 b3 16 7b 00 4c 89 f7 b8 01 00 00 00 87 05 55 f4 0c 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff c0 f0 5a 8d 74 47 48 c7 c0 60 52 d6 8e 48 c1 e8
RSP: 0018:ffffc90000a2f9f8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a5e01d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d5af0c0
RBP: ffffc90000a2fcd0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3165a90 R12: 0000000000002904
R13: ffffffff81a6d47e R14: ffffffff8d5af0c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888126ee9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37783b CR3: 0000000035c22000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_core kernel/rcu/tree.c:2856 [inline]
 rcu_cpu_kthread+0x7da/0x1b50 kernel/rcu/tree.c:2949
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>