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WARNING: kernel/rcu/tree_stall.h:1050 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050, CPU#1: syz.0.5118/23157
Modules linked in:
CPU: 1 UID: 0 PID: 23157 Comm: syz.0.5118 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 60 74 d3 99 be 04 00 00 00 e8 63 79 7d 00 4c 89 f7 b8 01 00 00 00 87 05 85 71 2c 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 29 34 8e 74 47 48 c7 c0 30 6c c4 8f 48 c1 e8
RSP: 0018:ffffc90000a08bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a702cd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e342980
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff33a6e8c R12: 0000000000002904
R13: 1ffff110170e7602 R14: ffffffff8e342980 R15: dffffc0000000000
FS:  00007f8a0bbf66c0(0000) GS:ffff888125ae1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2c29b4 CR3: 000000005f562000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:94 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:125 [inline]
RIP: 0010:do_syscall_64+0xc3/0xfa0 arch/x86/entry/syscall_64.c:90
Code: 00 48 8b 7d 08 48 89 7b 18 e8 c9 72 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 d9 3e 44 f6 90 90 e8 82 3e 44 f6 fb 49 8b 57 08 <f6> c2 3f 74 0e 4c 89 f7 4c 89 ee e8 cd 16 27 f6 49 89 c4 90 90 41
RSP: 0018:ffffc9001133fee0 EFLAGS: 00000282
RAX: 89806c78da903f00 RBX: ffffc9001133fee0 RCX: 89806c78da903f00
RDX: 0000000000000000 RSI: ffffffff8dbc0cb8 RDI: ffffffff8c037e00
RBP: ffffc9001133ff38 R08: ffffffff8fc43c37 R09: 1ffffffff1f88786
R10: dffffc0000000000 R11: fffffbfff1f88787 R12: 000000000000000f
R13: 000000000000000f R14: ffffc9001133ff48 R15: ffff88807f92dac0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a0d92ada9
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f8a0bbf5a80 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f8a0dbd5fa0 RCX: 00007f8a0d92ada9
RDX: 00007f8a0bbf5a80 RSI: 00007f8a0bbf5bb0 RDI: 0000000000000021
RBP: 00007f8a0da11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f8a0dbd6038 R14: 00007f8a0dbd5fa0 R15: 00007ffdcdf55838
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 48 8b             	add    %cl,-0x75(%rax)
   3:	7d 08                	jge    0xd
   5:	48 89 7b 18          	mov    %rdi,0x18(%rbx)
   9:	e8 c9 72 00 00       	call   0x72d7
   e:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  13:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  18:	90                   	nop
  19:	e8 d9 3e 44 f6       	call   0xf6443ef7
  1e:	90                   	nop
  1f:	90                   	nop
  20:	e8 82 3e 44 f6       	call   0xf6443ea7
  25:	fb                   	sti
  26:	49 8b 57 08          	mov    0x8(%r15),%rdx
* 2a:	f6 c2 3f             	test   $0x3f,%dl <-- trapping instruction
  2d:	74 0e                	je     0x3d
  2f:	4c 89 f7             	mov    %r14,%rdi
  32:	4c 89 ee             	mov    %r13,%rsi
  35:	e8 cd 16 27 f6       	call   0xf6271707
  3a:	49 89 c4             	mov    %rax,%r12
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	41                   	rex.B