------------[ cut here ]------------
WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049, CPU#1: rcuc/1/28
Modules linked in:
CPU: 1 UID: 0 PID: 28 Comm: rcuc/1 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
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:1049
Code: ff ff 48 c7 c7 a0 35 c1 98 be 04 00 00 00 e8 e3 fe 7b 00 4c 89 f7 b8 01 00 00 00 87 05 05 63 1a 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 3b 5b 8d 74 47 48 c7 c0 70 42 db 8e 48 c1 e8
RSP: 0018:ffffc90000a2f998 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a6d28d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d5b3b80
RBP: ffffc90000a2fcb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff31826b4 R12: 0000000000002904
R13: ffffffff81a7c783 R14: ffffffff8d5b3b80 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888126e03000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 000000001f3ca000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_core kernel/rcu/tree.c:2852 [inline]
 rcu_cpu_kthread+0x87a/0x1c40 kernel/rcu/tree.c:2945
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>