Comment # 1 on bug 1212833 from Kostas Peletidis

I saw the same NULL pointer dereference during bootup yesterday on Tumbleweed.

Hardware name: LENOVO 20XGS0V508/20XGS0V508, BIOS R1NET>
Linux version: 6.3.9-1

Excerpt from the output of 'sudo journalctl -b -2 --no-hostname' follows:

```
Jun 28 08:53:10 polkitd[1163]: Started polkitd version 121
Jun 28 08:53:10 kernel: BUG: kernel NULL pointer dereference, address:
00000000>
Jun 28 08:53:10 kernel: #PF: supervisor read access in kernel mode
Jun 28 08:53:10 kernel: #PF: error_code(0x0000) - not-present page
Jun 28 08:53:10 kernel: PGD 0 P4D 0 
Jun 28 08:53:10 kernel: Oops: 0000 [#1] PREEMPT SMP NOPTI
Jun 28 08:53:10 kernel: CPU: 10 PID: 1150 Comm: irqbalance Not tainted
6.3.9-1->
Jun 28 08:53:10 kernel: Hardware name: LENOVO 20XGS0V508/20XGS0V508, BIOS
R1NET>
Jun 28 08:53:10 kernel: RIP: 0010:show_interrupts+0x24c/0x340
Jun 28 08:53:10 kernel: Code: 85 d2 74 0f 48 c7 c6 c1 1c 3a 97 48 89 ef e8 db
0>
Jun 28 08:53:10 kernel: RSP: 0018:ffffb7cd8158fcd8 EFLAGS: 00010006
Jun 28 08:53:10 kernel: RAX: 0000000000000000 RBX: 000000000000000a RCX:
ffff0a>
Jun 28 08:53:10 kernel: RDX: 0000000000001000 RSI: 0000000000000004 RDI:
000000>
Jun 28 08:53:10 kernel: RBP: ffff8ae9105191e0 R08: 0000000000000004 R09:
ffff8a>
Jun 28 08:53:10 kernel: R10: ffffffffffffffff R11: 0000000000000000 R12:
ffff8a>
Jun 28 08:53:10 kernel: R13: 0000000000000246 R14: ffff8ae9001872a4 R15:
000000>
Jun 28 08:53:10 kernel: FS:  00007fa55ddff780(0000) GS:ffff8aebdef00000(0000)
k>
Jun 28 08:53:10 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 28 08:53:10 kernel: CR2: 000000000000005a CR3: 00000001072d2000 CR4:
000000>
Jun 28 08:53:10 kernel: PKRU: 55555554
Jun 28 08:53:10 kernel: Call Trace:
Jun 28 08:53:10 kernel:  <TASK>
Jun 28 08:53:10 kernel:  ? __die+0x23/0x70
Jun 28 08:53:10 kernel:  ? page_fault_oops+0x14d/0x490
Jun 28 08:53:10 kernel:  ? number+0x320/0x3b0
Jun 28 08:53:10 kernel:  ? exc_page_fault+0x6e/0x150
Jun 28 08:53:10 kernel:  ? asm_exc_page_fault+0x26/0x30
Jun 28 08:53:10 kernel:  ? show_interrupts+0x24c/0x340
Jun 28 08:53:10 kernel:  ? show_interrupts+0x25f/0x340
Jun 28 08:53:10 kernel:  seq_read_iter+0x2af/0x480
Jun 28 08:53:10 kernel:  proc_reg_read_iter+0x51/0x90
Jun 28 08:53:10 kernel:  vfs_read+0x1f8/0x2d0
Jun 28 08:53:10 kernel:  ksys_read+0x67/0xe0
Jun 28 08:53:10 kernel:  do_syscall_64+0x60/0x90
Jun 28 08:53:10 kernel:  ? syscall_exit_to_user_mode+0x1b/0x40
Jun 28 08:53:10 kernel:  ? do_syscall_64+0x6c/0x90
Jun 28 08:53:10 kernel:  ? exit_to_user_mode_prepare+0x188/0x1f0
Jun 28 08:53:10 kernel:  ? syscall_exit_to_user_mode+0x1b/0x40
Jun 28 08:53:10 kernel:  ? do_syscall_64+0x6c/0x90
Jun 28 08:53:10 kernel:  ? syscall_exit_to_user_mode+0x1b/0x40
Jun 28 08:53:10 kernel:  ? do_syscall_64+0x6c/0x90
Jun 28 08:53:10 kernel:  ? do_syscall_64+0x6c/0x90
Jun 28 08:53:10 kernel:  ? do_syscall_64+0x6c/0x90
Jun 28 08:53:10 kernel:  entry_SYSCALL_64_after_hwframe+0x72/0xdc
Jun 28 08:53:10 kernel: RIP: 0033:0x7fa55dfae091
Jun 28 08:53:10 kernel: Code: 00 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
9>
Jun 28 08:53:10 kernel: RSP: 002b:00007ffc5cc762b8 EFLAGS: 00000246 ORIG_RAX:
0>
Jun 28 08:53:10 kernel: RAX: ffffffffffffffda RBX: 000055a1029392a0 RCX:
00007f>
Jun 28 08:53:10 kernel: RDX: 0000000000000400 RSI: 000055a102939500 RDI:
000000>
Jun 28 08:53:10 kernel: RBP: 00007fa55e08f660 R08: 0000000000000008 R09:
000000>
Jun 28 08:53:10 kernel: R10: 0000000000001000 R11: 0000000000000246 R12:
000000>
Jun 28 08:53:10 kernel: R13: 0000000000000a68 R14: 00007fa55e08ed60 R15:
000000>
Jun 28 08:53:10 kernel:  </TASK>
Jun 28 08:53:10 kernel: Modules linked in: msr binfmt_misc nls_iso8859_1
nls_cp>
Jun 28 08:53:10 kernel:  rfkill soundcore ac thermal tiny_power_button
acpi_cpu>
Jun 28 08:53:10 kernel: CR2: 000000000000005a
Jun 28 08:53:10 kernel: ---[ end trace 0000000000000000 ]---
Jun 28 08:53:10 kernel: RIP: 0010:show_interrupts+0x24c/0x340
Jun 28 08:53:10 kernel: Code: 85 d2 74 0f 48 c7 c6 c1 1c 3a 97 48 89 ef e8 db
0>
Jun 28 08:53:10 kernel: RSP: 0018:ffffb7cd8158fcd8 EFLAGS: 00010006
Jun 28 08:53:10 kernel: RAX: 0000000000000000 RBX: 000000000000000a RCX:
ffff0a>
Jun 28 08:53:10 kernel: RDX: 0000000000001000 RSI: 0000000000000004 RDI:
000000>
Jun 28 08:53:10 kernel: RBP: ffff8ae9105191e0 R08: 0000000000000004 R09:
ffff8a>
Jun 28 08:53:10 kernel: R10: ffffffffffffffff R11: 0000000000000000 R12:
ffff8a>
Jun 28 08:53:10 kernel: R13: 0000000000000246 R14: ffff8ae9001872a4 R15:
000000>
Jun 28 08:53:10 kernel: FS:  00007fa55ddff780(0000) GS:ffff8aebdef00000(0000)
k>
Jun 28 08:53:10 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 28 08:53:10 kernel: CR2: 000000000000005a CR3: 00000001072d2000 CR4:
000000>
Jun 28 08:53:10 kernel: PKRU: 55555554
Jun 28 08:53:10 kernel: note: irqbalance[1150] exited with irqs disabled
Jun 28 08:53:10 kernel: note: irqbalance[1150] exited with preempt_count 1
Jun 28 08:53:10 kernel: ------------[ cut here ]------------
Jun 28 08:53:10 kernel: Voluntary context switch within RCU read-side critical
>
Jun 28 08:53:10 kernel: WARNING: CPU: 10 PID: 1150 at
kernel/rcu/tree_plugin.h:>
Jun 28 08:53:10 kernel: Modules linked in: msr binfmt_misc nls_iso8859_1
nls_cp>
Jun 28 08:53:10 kernel:  rfkill soundcore ac thermal tiny_power_button
acpi_cpu>
Jun 28 08:53:10 kernel: CPU: 10 PID: 1150 Comm: irqbalance Tainted: G      D  
>
Jun 28 08:53:10 kernel: Hardware name: LENOVO 20XGS0V508/20XGS0V508, BIOS
R1NET>
Jun 28 08:53:10 kernel: RIP: 0010:rcu_note_context_switch+0x5e6/0x640
Jun 28 08:53:10 kernel: Code: 00 00 00 00 0f 85 31 fd ff ff 49 89 84 24 a0 00
0>
Jun 28 08:53:10 kernel: RSP: 0018:ffffb7cd8158fcf0 EFLAGS: 00010082
Jun 28 08:53:10 kernel: RAX: 0000000000000000 RBX: ffff8aebdef3ab40 RCX:
000000>
Jun 28 08:53:10 kernel: RDX: ffff8aebdef274c8 RSI: 0000000000000001 RDI:
ffff8a>
Jun 28 08:53:10 kernel: RBP: 0000000000000000 R08: 0000000000000000 R09:
ffffb7>
Jun 28 08:53:10 kernel: R10: 0000000000000003 R11: ffff8aebee2c0fe8 R12:
ffff8a>
Jun 28 08:53:10 kernel: R13: ffff8ae903f00000 R14: 0000000000000002 R15:
000000>
Jun 28 08:53:10 kernel: FS:  0000000000000000(0000) GS:ffff8aebdef00000(0000)
k>
Jun 28 08:53:10 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 28 08:53:10 kernel: CR2: 000000000000005a CR3: 000000032ec36000 CR4:
000000>
Jun 28 08:53:10 kernel: PKRU: 55555554
Jun 28 08:53:10 kernel: Call Trace:
Jun 28 08:53:10 kernel:  <TASK>
Jun 28 08:53:10 kernel:  ? rcu_note_context_switch+0x5e6/0x640
Jun 28 08:53:10 kernel:  ? __warn+0x81/0x130
Jun 28 08:53:10 kernel:  ? rcu_note_context_switch+0x5e6/0x640
Jun 28 08:53:10 kernel:  ? report_bug+0x171/0x1a0
Jun 28 08:53:10 kernel:  ? handle_bug+0x3c/0x80
Jun 28 08:53:10 kernel:  ? exc_invalid_op+0x17/0x70
Jun 28 08:53:10 kernel:  ? asm_exc_invalid_op+0x1a/0x20
Jun 28 08:53:10 kernel:  ? rcu_note_context_switch+0x5e6/0x640
Jun 28 08:53:10 kernel:  __schedule+0xb0/0x1490
Jun 28 08:53:10 kernel:  ? mt_destroy_walk.isra.0+0x2d0/0x330
Jun 28 08:53:10 kernel:  ? kmem_cache_free+0x19/0x360
Jun 28 08:53:10 kernel:  schedule+0x5e/0xd0
Jun 28 08:53:10 kernel:  schedule_preempt_disabled+0x15/0x30
Jun 28 08:53:10 kernel:  rwsem_down_write_slowpath+0x259/0x600
Jun 28 08:53:10 kernel:  ? __slab_free+0xc4/0x300
Jun 28 08:53:10 kernel:  ? mntput_no_expire+0x4a/0x250
Jun 28 08:53:10 kernel:  down_write+0x5b/0x60
Jun 28 08:53:10 kernel:  put_mnt_ns+0x38/0x90
Jun 28 08:53:10 kernel:  free_nsproxy+0x1b/0x1b0
Jun 28 08:53:10 kernel:  do_exit+0x334/0xa70
Jun 28 08:53:10 kernel:  make_task_dead+0x81/0x170
Jun 28 08:53:10 kernel:  rewind_stack_and_make_dead+0x17/0x20
Jun 28 08:53:10 kernel: RIP: 0033:0x7fa55dfae091
Jun 28 08:53:10 kernel: Code: Unable to access opcode bytes at 0x7fa55dfae067.
Jun 28 08:53:10 kernel: RSP: 002b:00007ffc5cc762b8 EFLAGS: 00000246 ORIG_RAX:
0>
Jun 28 08:53:10 kernel: RAX: ffffffffffffffda RBX: 000055a1029392a0 RCX:
00007f>
Jun 28 08:53:10 kernel: RDX: 0000000000000400 RSI: 000055a102939500 RDI:
000000>
Jun 28 08:53:10 kernel: RBP: 00007fa55e08f660 R08: 0000000000000008 R09:
000000>
Jun 28 08:53:10 kernel: R10: 0000000000001000 R11: 0000000000000246 R12:
000000>
Jun 28 08:53:10 kernel: R13: 0000000000000a68 R14: 00007fa55e08ed60 R15:
000000>
Jun 28 08:53:10 kernel:  </TASK>
Jun 28 08:53:10 kernel: ---[ end trace 0000000000000000 ]---
```