------------[ cut here ]------------
WARNING: CPU: 1 PID: 20 at kernel/rcu/tree_stall.h:937 rcu_check_gp_start_stall+0x2c8/0x450 kernel/rcu/tree_stall.h:922
Modules linked in:
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:rcu_check_gp_start_stall+0x2c8/0x450 kernel/rcu/tree_stall.h:937
Code: c7 c7 60 2c 43 91 be 04 00 00 00 e8 82 89 5e 00 b8 01 00 00 00 87 05 97 92 d7 0f 85 c0 0f 85 1c ff ff ff 48 c7 c0 c0 3a 92 8c <0f> 0b 49 39 c7 74 47 48 c7 c0 84 8e e4 8d 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc90000da7a78 EFLAGS: 00010046
RAX: ffffffff8c923ac0 RBX: 00000000ffffcd51 RCX: ffffffff816b99be
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff91432c60
RBP: ffffc90000da7cb0 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c923ac0
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f224000 CR3: 000000001fb44000 CR4: 00000000003526e0
Call Trace:
 <TASK>
 rcu_core+0x657/0x1650 kernel/rcu/tree.c:2758
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558
 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:921
 smpboot_thread_fn+0x51b/0x9d0 kernel/smpboot.c:164
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
 </TASK>