------------[ cut here ]------------
WARNING: CPU: 0 PID: 12737 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 0 UID: 0 PID: 12737 Comm: syz.5.1749 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 20 74 b0 99 be 04 00 00 00 e8 53 e0 7c 00 4c 89 f7 b8 01 00 00 00 87 05 15 67 09 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 f4 13 8e 74 47 48 c7 c0 60 e6 a3 8f 48 c1 e8
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a70cfd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e13f480
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3360e84 R12: 0000000000002904
R13: 1ffff110170c75f2 R14: ffffffff8e13f480 R15: dffffc0000000000
FS:  000055556f985500(0000) GS:ffff888125c11000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c352901 CR3: 000000003072c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
 handle_softirqs+0x283/0x870 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:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_single+0x3a9/0x590 kernel/smp.c:687
Code: 33 44 89 f6 83 e6 01 31 ff e8 83 7a 0b 00 41 83 e6 01 75 11 e8 38 76 0b 00 4d 89 fe eb 3f e8 2e 76 0b 00 eb 3c 4d 89 fe f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 11 76 0b 00
RSP: 0018:ffffc9000cca7a40 EFLAGS: 00000293
RAX: ffffffff81b44f8f RBX: ffffc9000cca7a88 RCX: ffff88802ee05a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000cca7b30 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6
R10: dffffc0000000000 R11: ffffffff81706100 R12: 1ffff92001994f51
R13: dffffc0000000000 R14: 1ffff92001994f4c R15: 1ffff92001994f4c
 task_function_call kernel/events/core.c:121 [inline]
 event_function_call+0x326/0x970 kernel/events/core.c:341
 perf_event_release_kernel+0x15d/0x510 kernel/events/core.c:5801
 perf_release+0x38/0x50 kernel/events/core.c:5876
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c0198eec9
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:00007fffbf7ec9e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f3c01be7da0 RCX: 00007f3c0198eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3c01be7da0 R08: 0000000000000200 R09: 0000001dbf7eccdf
R10: 00007f3c01be7cb0 R11: 0000000000000246 R12: 000000000005c517
R13: 00007f3c01be6360 R14: ffffffffffffffff R15: 00007fffbf7ecb00
 </TASK>
----------------
Code disassembly (best guess):
   0:	33 44 89 f6          	xor    -0xa(%rcx,%rcx,4),%eax
   4:	83 e6 01             	and    $0x1,%esi
   7:	31 ff                	xor    %edi,%edi
   9:	e8 83 7a 0b 00       	call   0xb7a91
   e:	41 83 e6 01          	and    $0x1,%r14d
  12:	75 11                	jne    0x25
  14:	e8 38 76 0b 00       	call   0xb7651
  19:	4d 89 fe             	mov    %r15,%r14
  1c:	eb 3f                	jmp    0x5d
  1e:	e8 2e 76 0b 00       	call   0xb7651
  23:	eb 3c                	jmp    0x61
  25:	4d 89 fe             	mov    %r15,%r14
  28:	f3 90                	pause
* 2a:	43 0f b6 04 2c       	movzbl (%r12,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	75 0f                	jne    0x42
  33:	f7 03 01 00 00 00    	testl  $0x1,(%rbx)
  39:	74 1d                	je     0x58
  3b:	e8 11 76 0b 00       	call   0xb7651