------------[ cut here ]------------
WARNING: CPU: 1 PID: 14953 at kernel/rcu/tree_stall.h:937 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:929
Modules linked in:
CPU: 1 PID: 14953 Comm: syz.9.2619 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:937
Code: ff ff ff 48 c7 c7 20 6c 10 96 be 04 00 00 00 e8 da 06 58 00 48 89 df b8 01 00 00 00 87 05 5c 3e ac 14 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff c0 08 12 8c 74 47 48 c7 c0 c4 c2 69 8d 48 c1 e8 03
RSP: 0018:ffffc90000dd0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8c1208c0 RCX: ffffffff81642db6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8c1208c0
RBP: ffffc90000dd0e10 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff2c20d84 R11: 1ffffffff2c20d84 R12: 0000000000002904
R13: ffffffff8c1208c0 R14: 0000000000000a02 R15: dffffc0000000000
FS:  0000555579bc8500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c40a86d CR3: 0000000023313000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x5ef/0x15d0 kernel/rcu/tree.c:2758
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 3e 1d aa f7 48 89 df e8 06 f2 aa f7 e8 81 8c cb f7 fb bf 01 00 00 00 <e8> 46 15 9f f7 65 8b 05 27 13 50 76 85 c0 74 02 5b c3 e8 d4 1d 4e
RSP: 0018:ffffc900022e7bc0 EFLAGS: 00000282
RAX: a0a451b8e74dcf00 RBX: ffff88807db1a500 RCX: a0a451b8e74dcf00
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: 0000000000000001
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100fb634a1
R10: ffffed100fb634a1 R11: 1ffff1100fb634a0 R12: ffff88807db1a500
R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x11d6/0x12c0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7efcc026eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdbba3e428 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00000000000e1672 RCX: 00007efcc026eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efcc04b5fac
RBP: 0000000000000032 R08: 000e981a5e74a958 R09: 00000008bba3e71f
R10: 00007ffdbba3e520 R11: 0000000000000246 R12: 00007efcc04b5fac
R13: 00007ffdbba3e520 R14: 00000000000e16a4 R15: 00007ffdbba3e540
 </TASK>
----------------
Code disassembly (best guess):
   0:	f6 ff                	idiv   %bh
   2:	0f 1f 00             	nopl   (%rax)
   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 3e 1d aa f7       	call   0xf7aa1d55
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 06 f2 aa f7       	call   0xf7aaf225
  1f:	e8 81 8c cb f7       	call   0xf7cb8ca5
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 46 15 9f f7       	call   0xf79f1575 <-- trapping instruction
  2f:	65 8b 05 27 13 50 76 	mov    %gs:0x76501327(%rip),%eax        # 0x7650135d
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	d4                   	(bad)
  3e:	1d                   	.byte 0x1d
  3f:	4e                   	rex.WRX