BUG: unable to handle page fault for address: ffffffff00000238
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD c572067 P4D c572067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.0-rc7-syzkaller-00072-gdad9774deaf1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:dev_hard_header include/linux/netdevice.h:3137 [inline]
RIP: 0010:lapbeth_data_transmit+0x24f/0x360 drivers/net/wan/lapbether.c:257
Code: 49 8d bc 24 38 02 00 00 66 89 9d b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c6 00 00 00 <49> 8b 9c 24 38 02 00 00 48 85 db 74 47 e8 4f fc c3 fb 48 89 da 48
RSP: 0018:ffffc90000007c20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000012 RCX: 0000000000000003
RDX: 1fffffffe0000047 RSI: ffffffff8807bdbb RDI: ffffffff00000238
RBP: ffff88823bce6f00 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000094001 R12: ffffffff00000000
R13: 0000000000000000 R14: ffff8880231d3914 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000238 CR3: 000000000c571000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lapb_data_transmit+0x93/0xc0 net/lapb/lapb_iface.c:447
 lapb_transmit_buffer+0x187/0x3a0 net/lapb/lapb_out.c:149
 lapb_send_control+0x1cb/0x370 net/lapb/lapb_subr.c:251
 lapb_t1timer_expiry+0x5e0/0x8f0 net/lapb/lapb_timer.c:142
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:113
Code: eb 03 83 e3 01 89 de 0f 1f 44 00 00 84 db 75 1b 0f 1f 44 00 00 eb 0c 0f 1f 44 00 00 0f 00 2d f7 4f a1 00 0f 1f 44 00 00 fb f4 <fa> 5b c3 cc 0f 1f 00 66 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 0f
RSP: 0018:ffffffff8c407d18 EFLAGS: 00000246
RAX: ffffffff8c495780 RBX: 0000000000000000 RCX: ffffffff8a10c4b5
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888014ab9064 R08: 0000000000000001 R09: ffff8880b9836ceb
R10: ffffed1017306d9d R11: 0000000000000000 R12: 0000000000000001
R13: ffff888014ab9000 R14: ffff888014ab9064 R15: 0000000000000000
 acpi_idle_do_entry+0x53/0x70 drivers/acpi/processor_idle.c:573
 acpi_idle_enter+0x173/0x290 drivers/acpi/processor_idle.c:711
 cpuidle_enter_state+0xd3/0x6f0 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
 cpuidle_idle_call kernel/sched/idle.c:215 [inline]
 do_idle+0x2fe/0x3c0 kernel/sched/idle.c:282
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
 rest_init+0x16f/0x2b0 init/main.c:735
 arch_call_rest_init+0x13/0x30 init/main.c:834
 start_kernel+0x3b6/0x490 init/main.c:1088
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
 x86_64_start_kernel+0xb3/0xc0 arch/x86/kernel/head64.c:537
 secondary_startup_64_no_verify+0xf4/0xfb
 </TASK>
Modules linked in:
CR2: ffffffff00000238
---[ end trace 0000000000000000 ]---
RIP: 0010:dev_hard_header include/linux/netdevice.h:3137 [inline]
RIP: 0010:lapbeth_data_transmit+0x24f/0x360 drivers/net/wan/lapbether.c:257
Code: 49 8d bc 24 38 02 00 00 66 89 9d b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c6 00 00 00 <49> 8b 9c 24 38 02 00 00 48 85 db 74 47 e8 4f fc c3 fb 48 89 da 48
RSP: 0018:ffffc90000007c20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000012 RCX: 0000000000000003
RDX: 1fffffffe0000047 RSI: ffffffff8807bdbb RDI: ffffffff00000238
RBP: ffff88823bce6f00 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000094001 R12: ffffffff00000000
R13: 0000000000000000 R14: ffff8880231d3914 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000238 CR3: 000000000c571000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	49 8d bc 24 38 02 00 	lea    0x238(%r12),%rdi
   7:	00
   8:	66 89 9d b8 00 00 00 	mov    %bx,0xb8(%rbp)
   f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  16:	fc ff df
  19:	48 89 fa             	mov    %rdi,%rdx
  1c:	48 c1 ea 03          	shr    $0x3,%rdx
  20:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  24:	0f 85 c6 00 00 00    	jne    0xf0
* 2a:	49 8b 9c 24 38 02 00 	mov    0x238(%r12),%rbx <-- trapping instruction
  31:	00
  32:	48 85 db             	test   %rbx,%rbx
  35:	74 47                	je     0x7e
  37:	e8 4f fc c3 fb       	callq  0xfbc3fc8b
  3c:	48 89 da             	mov    %rbx,%rdx
  3f:	48                   	rex.W