------------[ cut here ]------------
WARNING: CPU: 0 PID: 7574 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: 7574 Comm: syz.3.485 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 64 31 97 be 04 00 00 00 e8 7a eb 6d 00 48 89 df b8 01 00 00 00 87 05 7c e2 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff c0 73 13 8d 74 47 48 c7 c0 1c 9b 8b 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d1373c0 RCX: ffffffff81718216
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d1373c0
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e62c94 R12: 0000000000002904
R13: ffffffff8d1373c0 R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f4f4b2396c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000009c030 CR3: 000000005f34f000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rcu_core+0x635/0x1770 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+0xd3/0x190 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 ac d6 f6 48 89 df e8 c2 80 d7 f6 e8 bd 98 fb f6 fb bf 01 00 00 00 <e8> a2 87 ca f6 65 8b 05 33 b0 71 75 85 c0 74 02 5b c3 e8 30 97 6e
RSP: 0018:ffffc9000ba4fc78 EFLAGS: 00000286
RAX: f0dd2bb8f5153100 RBX: ffff88805f30e5c0 RCX: f0dd2bb8f5153100
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001
RBP: ffff88805f30e858 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: 1ffff1100be61d0b
R13: 0000000000000011 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x11f5/0x13f0 kernel/signal.c:2905
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/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:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffdbcfa5a0a
Code: 89 fd e8 29 03 00 00 44 89 ef 48 8b 75 c8 48 85 c0 0f 88 cb 00 00 00 48 89 c2 eb a7 4c 29 d2 48 0f ba e2 3e 0f 82 ad 00 00 00 <48> bf ff ff ff ff ff ff ff 7f 48 21 fa 49 0f af d1 48 01 c2 48 d3
RSP: 002b:00007f4f4b238ff0 EFLAGS: 00000216
RAX: 003745ef1194b46e RBX: 00007ffdbcfa10b0 RCX: 0000000000000018
RDX: 0000000001aa8b56 RSI: 00007f4f4b2390b0 RDI: 0000000000000001
RBP: 00007f4f4b239030 R08: 00000000000000e1 R09: 0000000000745d1e
R10: 00000077f2b8234a R11: 000000000000aa6c R12: 0000000000000010
R13: 00007f4f4a616038 R14: 00007ffdbcfa1080 R15: 000000000000aa6c
 </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 ac d6 f6       	call   0xf6d6ac21
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 c2 80 d7 f6       	call   0xf6d780e1
  1f:	e8 bd 98 fb f6       	call   0xf6fb98e1
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 a2 87 ca f6       	call   0xf6ca87d1 <-- trapping instruction
  2f:	65 8b 05 33 b0 71 75 	mov    %gs:0x7571b033(%rip),%eax        # 0x7571b069
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	30                   	.byte 0x30
  3e:	97                   	xchg   %eax,%edi
  3f:	6e                   	outsb  %ds:(%rsi),(%dx)