------------[ cut here ]------------
WARNING: CPU: 1 PID: 6077 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 1 UID: 0 PID: 6077 Comm: syz.3.39 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 60 04 9f 99 be 04 00 00 00 e8 b3 be 7e 00 4c 89 f7 b8 01 00 00 00 87 05 95 ff f8 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 05 14 8e 74 47 48 c7 c0 30 e3 9d 8f 48 c1 e8
RSP: 0018:ffffc90000a08bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a604bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e140580
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff333e08c R12: 0000000000002904
R13: 1ffff110170e7602 R14: ffffffff8e140580 R15: dffffc0000000000
FS:  00007fcfc6c606c0(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2980dc CR3: 00000000721ea000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
 handle_softirqs+0x283/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 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:702
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7256
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 2b c6 46 f6 e8 76 8f 7e f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000b3c79a0 EFLAGS: 00000286
RAX: 1ad6712aca342f00 RBX: 0000000000000000 RCX: 1ad6712aca342f00
RDX: 0000000000000000 RSI: ffffffff8d7e3b6a RDI: 0000000000000001
RBP: ffffc9000b3c7a50 R08: ffffffff8f9db337 R09: 1ffffffff1f3b666
R10: dffffc0000000000 R11: fffffbfff1f3b667 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92001678f34
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x8f/0x130 kernel/kcov.c:351
Code: 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 90 8f 92 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 <65> 44 8b 1d c9 65 d0 10 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01
RSP: 0018:ffffc9000b3c7b18 EFLAGS: 00000202
RAX: 000000000000001a RBX: 0000000000000005 RCX: 0000000000000005
RDX: ffffffff81d04a0c RSI: ffffffff8e1bb750 RDI: 0000000000000005
RBP: ffffc9000b3c7d10 R08: ffff88802b283c80 R09: 0000000000000013
R10: 0000000000000018 R11: 0000000000000002 R12: 0000000081df6601
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000b3c7d8c
 is_net_admin_prog_type kernel/bpf/syscall.c:2758 [inline]
 bpf_prog_load+0x55c/0x19e0 kernel/bpf/syscall.c:2914
 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6134
 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfc5d8eec9
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:00007fcfc6c60038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcfc5fe5fa0 RCX: 00007fcfc5d8eec9
RDX: 0000000000000094 RSI: 0000200000000600 RDI: 0000000000000005
RBP: 00007fcfc5e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcfc5fe6038 R14: 00007fcfc5fe5fa0 R15: 00007ffd9d2211e8
 </TASK>
----------------
Code disassembly (best guess):
   0:	24 20                	and    $0x20,%al
   2:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
   7:	74 0c                	je     0x15
   9:	90                   	nop
   a:	0f 0b                	ud2
   c:	48 f7 03 10 00 00 00 	testq  $0x10,(%rbx)
  13:	74 64                	je     0x79
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 2b c6 46 f6       	call   0xf646c64a
  1f:	e8 76 8f 7e f6       	call   0xf67e8f9a
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 5b ab ff ff       	call   0xffffab8a <-- trapping instruction
  2f:	48 c7 44 24 40 00 00 	movq   $0x0,0x40(%rsp)
  36:	00 00
  38:	9c                   	pushf
  39:	8f 44 24 40          	pop    0x40(%rsp)
  3d:	8b                   	.byte 0x8b
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24