------------[ cut here ]------------
WARNING: CPU: 0 PID: 9668 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 0 PID: 9668 Comm: syz.0.1336 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 f4 ee 96 be 04 00 00 00 e8 ba ac 6c 00 48 89 df b8 01 00 00 00 87 05 ac bc 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 50 d3 8c 74 47 48 c7 c0 9c b4 4a 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35080 RCX: ffffffff817037e6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35080
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2ddde94 R12: 0000000000002904
R13: 1ffff110171c7a22 R14: 0000000000000a02 R15: dffffc0000000000
FS:  000055557b824500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000baf030 CR3: 000000002e802000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rcu_core+0x612/0x1720 kernel/rcu/tree.c:2462
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0a 90 ef f6 48 89 df e8 22 62 f0 f6 e8 6d 08 14 f7 fb bf 01 00 00 00 <e8> 32 79 e3 f6 65 8b 05 43 c5 8b 75 85 c0 74 02 5b c3 e8 60 a9 88
RSP: 0018:ffffc90002eb7d40 EFLAGS: 00000286
RAX: 40907d14a1d3cb00 RBX: ffff88807adf8940 RCX: 40907d14a1d3cb00
RDX: dffffc0000000000 RSI: ffffffff8aaabca0 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8e4a7fef R09: 1ffffffff1c94ffd
R10: dffffc0000000000 R11: fffffbfff1c94ffe R12: 0000000000000000
R13: 0000000100010000 R14: ffff88802c031e00 R15: 0000000000000010
 set_current_blocked kernel/signal.c:3077 [inline]
 signal_delivered kernel/signal.c:2938 [inline]
 signal_setup_done+0x189/0x310 kernel/signal.c:2950
 handle_signal arch/x86/kernel/signal.c:285 [inline]
 arch_do_signal_or_restart+0x492/0x780 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f360d24d9b0
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 <c3> 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007ffcf3eaabb8 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00007ffcf3eab2b0 RCX: 00007f360d385d67
RDX: 00007ffcf3eaabc0 RSI: 00007ffcf3eaacf0 RDI: 0000000000000011
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000745d1e
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000004386b
R13: 00007f360d5e6180 R14: ffffffffffffffff R15: 00007ffcf3eab8b0
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 f3                	add    %dh,%bl
   2:	0f 1e fa             	nop    %edx
   5:	53                   	push   %rbx
   6:	48 89 fb             	mov    %rdi,%rbx
   9:	48 83 c7 18          	add    $0x18,%rdi
   d:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  12:	e8 0a 90 ef f6       	call   0xf6ef9021
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 22 62 f0 f6       	call   0xf6f06241
  1f:	e8 6d 08 14 f7       	call   0xf7140891
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 32 79 e3 f6       	call   0xf6e37961 <-- trapping instruction
  2f:	65 8b 05 43 c5 8b 75 	mov    %gs:0x758bc543(%rip),%eax        # 0x758bc579
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	60                   	(bad)
  3e:	a9                   	.byte 0xa9
  3f:	88                   	.byte 0x88