------------[ cut here ]------------
WARNING: CPU: 0 PID: 3926 at kernel/rcu/tree_stall.h:937 rcu_check_gp_start_stall+0x2c8/0x450 kernel/rcu/tree_stall.h:922
Modules linked in:
CPU: 0 PID: 3926 Comm: syz.0.63 Not tainted 5.15.164-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:rcu_check_gp_start_stall+0x2c8/0x450 kernel/rcu/tree_stall.h:937
Code: c7 c7 60 cc 4a 91 be 04 00 00 00 e8 62 99 5e 00 b8 01 00 00 00 87 05 d7 2e df 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 c4 7f e9 8d 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046
RAX: ffffffff8c923ac0 RBX: 00000000ffffd44e RCX: ffffffff816b9d7e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff914acc60
RBP: ffffc90000007e10 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c923ac0
FS:  00007f565667e6c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562bd5c03320 CR3: 00000000765f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x657/0x1650 kernel/rcu/tree.c:2758
 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
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: a1 68 f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8e 2d 26 f7 48 89 df e8 66 81 27 f7 e8 f1 3c 4a f7 fb bf 01 00 00 00 <e8> 16 c6 1a f7 65 8b 05 d7 ca c5 75 85 c0 74 02 5b c3 e8 a4 e7 c3
RSP: 0018:ffffc90003167bc0 EFLAGS: 00000282
RAX: a0ea8f00c3920e00 RBX: ffff88805d5aef00 RCX: ffffffff91467f03
RDX: dffffc0000000000 RSI: ffffffff8a8b2a00 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8186e200 R09: ffffed100bab5de1
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000021
R13: dffffc0000000000 R14: ffff88805d5af398 R15: ffff88805d5aef00
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x13ee/0x14e0 kernel/signal.c:2892
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x97/0x130 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+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f56582203b9
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:00007f565667e048 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: fffffffffffffe00 RBX: 00007f56583af058 RCX: 00007f56582203b9
RDX: 0000000000000001 RSI: 0000000020001240 RDI: 0000000000000006
RBP: 00007f565828d8e6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000004 R14: 00007f56583af058 R15: 00007ffda1e176c8
 </TASK>
----------------
Code disassembly (best guess):
   0:	a1 68 f6 ff 90 53 48 	movabs 0xfb89485390fff668,%eax
   7:	89 fb
   9:	48 83 c7 18          	add    $0x18,%rdi
   d:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  12:	e8 8e 2d 26 f7       	call   0xf7262da5
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 66 81 27 f7       	call   0xf7278185
  1f:	e8 f1 3c 4a f7       	call   0xf74a3d15
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 16 c6 1a f7       	call   0xf71ac645 <-- trapping instruction
  2f:	65 8b 05 d7 ca c5 75 	mov    %gs:0x75c5cad7(%rip),%eax        # 0x75c5cb0d
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	a4                   	movsb  %ds:(%rsi),%es:(%rdi)
  3e:	e7 c3                	out    %eax,$0xc3