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WARNING: CPU: 1 PID: 9184 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 1 PID: 9184 Comm: syz.1.862 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 84 30 97 be 04 00 00 00 e8 6a ca 6d 00 48 89 df b8 01 00 00 00 87 05 1c 11 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 40 72 13 8d 74 47 48 c7 c0 6c 14 8b 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d137240 RCX: ffffffff81717376
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d137240
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e61094 R12: 0000000000002904
R13: ffffffff8d137240 R14: 0000000000000a02 R15: dffffc0000000000
FS:  000055556baed500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cbade8600 CR3: 000000007ad09000 CR4: 00000000003506e0
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 7a be da f6 48 89 df e8 32 93 db f6 e8 bd 9e ff f6 fb bf 01 00 00 00 <e8> 42 99 ce f6 65 8b 05 13 d0 75 75 85 c0 74 02 5b c3 e8 90 b7 72
RSP: 0018:ffffc900032c7c78 EFLAGS: 00000286
RAX: a7558aa301326e00 RBX: ffff88802dc00940 RCX: a7558aa301326e00
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001
RBP: ffff88802dc00dd8 R08: ffffffff8e8adfaf R09: 1ffffffff1d15bf5
R10: dffffc0000000000 R11: fffffbfff1d15bf6 R12: 1ffff11005b801bb
R13: 0000000000000021 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+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6cbac6b45a
Code: 65 66 0f c6 c0 01 0f 11 45 00 4c 89 e6 eb 09 90 48 8b 4b 08 48 83 c3 08 48 39 d1 72 f3 48 8d 46 f8 48 8b 76 f8 48 39 f2 73 13 <66> 0f 1f 44 00 00 48 8b 70 f8 48 83 e8 08 48 39 f2 72 f3 48 39 c3
RSP: 002b:00007ffee5b3a8d0 EFLAGS: 00000293
RAX: 00007f6cba4327a8 RBX: 00007f6cba428b30 RCX: ffffffff812e4af4
RDX: ffffffff812e4af4 RSI: ffffffff812e4b1a RDI: 00007f6cba42c418
RBP: 00007f6cba4218c0 R08: 00007f6cbb000000 R09: 00007f6cbb016128
R10: 0000000000000001 R11: 000000000000000f R12: 00007f6cba436f70
R13: 000000000000001e R14: 0000000000002ad6 R15: 0000000000000001
 </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 7a be da f6       	call   0xf6dabe91
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 32 93 db f6       	call   0xf6db9351
  1f:	e8 bd 9e ff f6       	call   0xf6ff9ee1
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 42 99 ce f6       	call   0xf6ce9971 <-- trapping instruction
  2f:	65 8b 05 13 d0 75 75 	mov    %gs:0x7575d013(%rip),%eax        # 0x7575d049
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	90                   	nop
  3e:	b7 72                	mov    $0x72,%bh