Re: [PATCH] selftests/ftrace: Correctly enable event in instance-event.tc

[Zheng Yejian <zhengyejian1@huawei.com>]

[-- Attachment #1: Type: text/plain, Size: 4700 bytes --]

On 2023/7/11 06:37, Steven Rostedt wrote:
> 
> Shuah, can you take this?
> 

Kindly ping and bug report :)

Hi, Steve, Ajay,

After this patch and run this testcase, I got an use-after-free report
by KASAN. Short log see [1], full logs see attach "panic.log".

And by simple bisect, I found it may be introduced by:

   27152bceea1d ("eventfs: Move tracing/events to eventfs")

Link: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27152bceea1df27ffebb12ac9cd9adbf2c4c3f35

[1]
# ./ftracetest test.d/instances/instance-event.tc
=== Ftrace unit tests ===
[1] Test creation and deletion of trace instances while setting an 
event[   89.472397] 
==================================================================
[   89.475053] BUG: KASAN: slab-use-after-free in 
__ftrace_event_enable_disable+0x1b/0x3a0
[   89.480039] Read of size 8 at addr ffff88814f5b2690 by task 
ftracetest/392
[   89.483906]
[   89.484560] CPU: 10 PID: 392 Comm: ftracetest Tainted: G        W 
      6.5.0+ #127
[   89.487033] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.489751] Call Trace:
[   89.490315]  <TASK>
[   89.490817]  dump_stack_lvl+0x4b/0x80
[   89.491570]  print_report+0xd0/0x620
[   89.492296]  ? __virt_addr_valid+0xf9/0x180
[   89.493134]  ? __ftrace_event_enable_disable+0x1b/0x3a0
[   89.494151]  kasan_report+0xb6/0xf0
[   89.494881]  ? __ftrace_event_enable_disable+0x1b/0x3a0
[   89.495878]  __ftrace_event_enable_disable+0x1b/0x3a0
[   89.496805]  event_enable_write+0x109/0x170
[   89.497631]  ? __pfx_event_enable_write+0x10/0x10
[   89.498618]  ? __pfx_bpf_lsm_file_permission+0x10/0x10
[   89.499659]  ? security_file_permission+0x51/0x2d0
[   89.500604]  vfs_write+0x175/0x670
[   89.501385]  ? __pfx_vfs_write+0x10/0x10
[   89.502246]  ? __pfx__raw_spin_lock+0x10/0x10
[   89.503187]  ? expand_files+0x9b/0x330
[   89.504011]  ? __pfx_expand_files+0x10/0x10
[   89.504898]  ? set_close_on_exec+0x7b/0xe0
[   89.505782]  ? __fget_light+0xae/0x1e0
[   89.506615]  ? _raw_spin_lock+0x85/0xe0
[   89.507989]  ksys_write+0xbd/0x160
[   89.509302]  ? __pfx_ksys_write+0x10/0x10
[   89.510493]  ? dnotify_flush+0x38/0x220
[   89.511654]  ? fpregs_assert_state_consistent+0x5a/0x70
[   89.513297]  ? exit_to_user_mode_prepare+0x32/0x110
[   89.514692]  do_syscall_64+0x3f/0x90
[   89.515516]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8

> On Mon, 26 Jun 2023 19:12:55 +0900
> Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
> 
>> On Mon, 26 Jun 2023 19:11:14 +0900
>> Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
>>
>>> On Mon, 26 Jun 2023 08:11:44 +0800
>>> Zheng Yejian <zhengyejian1@huawei.com> wrote:
>>>    
>>>> Function instance_set() expects to enable event 'sched_switch', so we
>>>> should set 1 to its 'enable' file.
>>>>
>>>> Testcase passed after this patch:
>>>>    # ./ftracetest test.d/instances/instance-event.tc
>>>>    === Ftrace unit tests ===
>>>>    [1] Test creation and deletion of trace instances while setting an event
>>>>    [PASS]
>>>>
>>>>    # of passed:  1
>>>>    # of failed:  0
>>>>    # of unresolved:  0
>>>>    # of untested:  0
>>>>    # of unsupported:  0
>>>>    # of xfailed:  0
>>>>    # of undefined(test bug):  0
>>>>    
>>>
>>> Good catch!
>>>
>>> Fixes: 91e6f1ce8657 ("ftracetest: Add instance created, delete, read and enable event test")
>>>
>>> It seems this tests internally broken but the result is same because this disabled
>>> error checking ('set +e').
>>
>> And
>>
>> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> 
> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
> 
> 

Thanks for your ack :)

-- Zheng Yejian

> -- Steve
> 
>>
>> Thanks!
>>
>>>
>>>    
>>>> Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
>>>> ---
>>>>   .../testing/selftests/ftrace/test.d/instances/instance-event.tc | 2 +-
>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
>>>> index 0eb47fbb3f44..42422e425107 100644
>>>> --- a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
>>>> +++ b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
>>>> @@ -39,7 +39,7 @@ instance_read() {
>>>>   
>>>>   instance_set() {
>>>>           while :; do
>>>> -                echo 1 > foo/events/sched/sched_switch
>>>> +                echo 1 > foo/events/sched/sched_switch/enable
>>>>           done 2> /dev/null
>>>>   }
>>>>   
>>>> -- 
>>>> 2.25.1
>>>>    
>>>
>>>
>>> -- 
>>> Masami Hiramatsu (Google) <mhiramat@kernel.org>
>>
>>
> 
> 

[-- Attachment #2: panic.log --]
[-- Type: text/plain, Size: 31759 bytes --]

# ./ftracetest test.d/instances/instance-event.tc
=== Ftrace unit tests ===
[1] Test creation and deletion of trace instances while setting an event[   89.472397] ==================================================================
[   89.475053] BUG: KASAN: slab-use-after-free in __ftrace_event_enable_disable+0x1b/0x3a0
[   89.480039] Read of size 8 at addr ffff88814f5b2690 by task ftracetest/392
[   89.483906] 
[   89.484560] CPU: 10 PID: 392 Comm: ftracetest Tainted: G        W          6.5.0+ #127
[   89.487033] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.489751] Call Trace:
[   89.490315]  <TASK>
[   89.490817]  dump_stack_lvl+0x4b/0x80
[   89.491570]  print_report+0xd0/0x620
[   89.492296]  ? __virt_addr_valid+0xf9/0x180
[   89.493134]  ? __ftrace_event_enable_disable+0x1b/0x3a0
[   89.494151]  kasan_report+0xb6/0xf0
[   89.494881]  ? __ftrace_event_enable_disable+0x1b/0x3a0
[   89.495878]  __ftrace_event_enable_disable+0x1b/0x3a0
[   89.496805]  event_enable_write+0x109/0x170
[   89.497631]  ? __pfx_event_enable_write+0x10/0x10
[   89.498618]  ? __pfx_bpf_lsm_file_permission+0x10/0x10
[   89.499659]  ? security_file_permission+0x51/0x2d0
[   89.500604]  vfs_write+0x175/0x670
[   89.501385]  ? __pfx_vfs_write+0x10/0x10
[   89.502246]  ? __pfx__raw_spin_lock+0x10/0x10
[   89.503187]  ? expand_files+0x9b/0x330
[   89.504011]  ? __pfx_expand_files+0x10/0x10
[   89.504898]  ? set_close_on_exec+0x7b/0xe0
[   89.505782]  ? __fget_light+0xae/0x1e0
[   89.506615]  ? _raw_spin_lock+0x85/0xe0
[   89.507989]  ksys_write+0xbd/0x160
[   89.509302]  ? __pfx_ksys_write+0x10/0x10
[   89.510493]  ? dnotify_flush+0x38/0x220
[   89.511654]  ? fpregs_assert_state_consistent+0x5a/0x70
[   89.513297]  ? exit_to_user_mode_prepare+0x32/0x110
[   89.514692]  do_syscall_64+0x3f/0x90
[   89.515516]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[   89.516574] RIP: 0033:0x7f2345c18077
[   89.517399] Code: 64 89 02 48 c7 c0 ff ff ff ff eb bb 0f 1f 80 00 00 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[   89.520853] RSP: 002b:00007ffc322ec108 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   89.522367] RAX: ffffffffffffffda RBX: 0000563f82f3f560 RCX: 00007f2345c18077
[   89.523717] RDX: 0000000000000002 RSI: 0000563f82f3f560 RDI: 0000000000000001
[   89.525086] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000563f82f8d9d9
[   89.526437] R10: 0000563f81225682 R11: 0000000000000246 R12: 0000000000000001
[   89.527805] R13: 0000000000000002 R14: 7fffffffffffffff R15: 00007ffc322ec2d0
[   89.529133]  </TASK>
[   89.529650] 
[   89.530135] Allocated by task 393:
[   89.530992] 
[   89.531458] Freed by task 437:
[   89.532558] 
[   89.533028] The buggy address belongs to the object at ffff88814f5b2680
[   89.533028]  which belongs to the cache trace_event_file of size 96
[   89.536893] The buggy address is located 16 bytes inside of
[   89.536893]  freed 96-byte region [ffff88814f5b2680, ffff88814f5b26e0)
[   89.540093] 
[   89.540565] The buggy address belongs to the physical page:
[   89.541682] 
[   89.542186] Memory state around the buggy address:
[   89.543171]  ffff88814f5b2580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   89.544561]  ffff88814f5b2600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   89.545991] >ffff88814f5b2680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   89.547357]                          ^
[   89.548180]  ffff88814f5b2700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   89.549603]  ffff88814f5b2780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   89.551022] ==================================================================
[   89.558057] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   89.559509] #PF: supervisor read access in kernel mode
[   89.560537] #PF: error_code(0x0000) - not-present page
[   89.561585] PGD 0 P4D 0 
[   89.562239] Oops: 0000 [#1] PREEMPT SMP KASAN PTI
[   89.563218] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G    B   W          6.5.0+ #127
[   89.564694] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.566739] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.567804] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.571057] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.572112] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.573464] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.576277] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.577668] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.579093] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.580476] FS:  0000000000000000(0000) GS:ffff8880bb280000(0000) knlGS:0000000000000000
[   89.582066] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.583190] CR2: 0000000000000008 CR3: 00000000102ee000 CR4: 00000000000006e0
[   89.584521] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.585820] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.587152] Call Trace:
[   89.587757]  <TASK>
[   89.588321]  ? __die_body+0x1f/0x70
[   89.589105]  ? page_fault_oops+0x1f5/0x580
[   89.589976]  ? __pfx_page_fault_oops+0x10/0x10
[   89.590892]  ? is_prefetch.isra.0+0x7a/0x260
[   89.591798]  ? __pfx_is_prefetch.isra.0+0x10/0x10
[   89.592755]  ? __rcu_read_unlock+0x50/0x260
[   89.593617]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.594597]  ? search_bpf_extables+0xb3/0xd0
[   89.595480]  ? fixup_exception+0x3b/0x4e0
[   89.596315]  ? exc_page_fault+0x59/0xb0
[   89.597122]  ? asm_exc_page_fault+0x26/0x30
[   89.597991]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.598940]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.599888]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.600838]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.601798]  ? __pfx_ring_buffer_lock_reserve+0x10/0x10
[   89.602799]  ? kasan_report+0x48/0xf0
[   89.603574]  ? ring_buffer_unlock_commit+0xfb/0x250
[   89.604529]  ? kasan_report+0x48/0xf0
[   89.605293]  trace_event_buffer_lock_reserve+0x145/0x210
[   89.606358]  trace_event_buffer_reserve+0xe2/0x150
[   89.607312]  trace_event_raw_event_sched_switch+0xb3/0x2d0
[   89.608335]  ? sched_clock_cpu+0x67/0x2e0
[   89.609141]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.610276]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.611407]  __traceiter_sched_switch+0x59/0x80
[   89.612286]  __schedule+0x72b/0x1580
[   89.613026]  ? __pfx___schedule+0x10/0x10
[   89.613842]  ? ct_nmi_exit+0xd8/0xf0
[   89.614584]  ? irqentry_exit+0x3b/0x50
[   89.615351]  ? rcu_preempt_deferred_qs+0x22/0x90
[   89.616241]  ? ct_kernel_exit.constprop.0+0xa0/0xc0
[   89.617147]  schedule_idle+0x33/0x50
[   89.617919]  do_idle+0x1f3/0x2f0
[   89.618621]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[   89.619603]  ? __pfx_do_idle+0x10/0x10
[   89.620397]  ? swake_up_locked.part.0+0x79/0x90
[   89.621300]  cpu_startup_entry+0x1d/0x20
[   89.622104]  start_secondary+0x1a8/0x1d0
[   89.622889]  ? __pfx_start_secondary+0x10/0x10
[   89.623754]  secondary_startup_64_no_verify+0x178/0x17b
[   89.624725]  </TASK>
[   89.625255] Modules linked in:
[   89.625972] CR2: 0000000000000008
[   89.626684] ---[ end trace 0000000000000000 ]---
[   89.626685] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   89.627201] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.628002] #PF: supervisor read access in kernel mode
[   89.628577] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.629117] #PF: error_code(0x0000) - not-present page
[   89.631094] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.631652] PGD 0 
[   89.632032] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.632582] P4D 0 
[   89.632808] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.633554] 
[   89.633789] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.634533] Oops: 0000 [#2] PREEMPT SMP KASAN PTI
[   89.634707] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.635450] CPU: 7 PID: 0 Comm: swapper/7 Tainted: G    B D W          6.5.0+ #127
[   89.635957] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.636709] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.637515] FS:  0000000000000000(0000) GS:ffff8880bb280000(0000) knlGS:0000000000000000
[   89.638259] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.639466] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.640291] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.640855] CR2: 0000000000000008 CR3: 00000000102ee000 CR4: 00000000000006e0
[   89.641450] RSP: 0018:ffffc900001e79f8 EFLAGS: 00010082
[   89.643342] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.644070] 
[   89.644620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.645349] RAX: 0000000000000000 RBX: 1ffff9200003cf48 RCX: ffffffffa5a808f7
[   89.645522] Kernel panic - not syncing: Attempted to kill the idle task!
[   89.646349] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.646352] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.646355] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.646357] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.646363] FS:  0000000000000000(0000) GS:ffff88823ba80000(0000) knlGS:0000000000000000
[   89.646366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.646368] CR2: 0000000000000008 CR3: 0000000144c12000 CR4: 00000000000006e0
[   89.646371] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.646373] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.646375] Call Trace:
[   89.646376]  <TASK>
[   89.646378]  ? __die_body+0x1f/0x70
[   89.646385]  ? page_fault_oops+0x1f5/0x580
[   89.646390]  ? __pfx_page_fault_oops+0x10/0x10
[   89.646394]  ? is_prefetch.isra.0+0x7a/0x260
[   89.646397]  ? __pfx_is_prefetch.isra.0+0x10/0x10
[   89.646401]  ? __rcu_read_unlock+0x50/0x260
[   89.646405]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.646409]  ? search_bpf_extables+0xb3/0xd0
[   89.646415]  ? fixup_exception+0x3b/0x4e0
[   89.646421]  ? exc_page_fault+0x59/0xb0
[   89.646427]  ? asm_exc_page_fault+0x26/0x30
[   89.646434]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.646437]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.646442]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.646446]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.646450]  ? __pfx_ring_buffer_lock_reserve+0x10/0x10
[   89.646454]  ? kasan_report+0x48/0xf0
[   89.646461]  ? ring_buffer_unlock_commit+0xfb/0x250
[   89.646465]  ? kasan_report+0x48/0xf0
[   89.646471]  trace_event_buffer_lock_reserve+0x145/0x210
[   89.646476]  trace_event_buffer_reserve+0xe2/0x150
[   89.646482]  trace_event_raw_event_sched_switch+0xb3/0x2d0
[   89.646488]  ? ct_nmi_exit+0x82/0xf0
[   89.646492]  ? sched_clock_cpu+0x67/0x2e0
[   89.646497]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.646504]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.646509]  __traceiter_sched_switch+0x59/0x80
[   89.646515]  __schedule+0x72b/0x1580
[   89.646520]  ? _raw_spin_unlock_irqrestore+0x16/0x50
[   89.646527]  ? __pfx___schedule+0x10/0x10
[   89.646531]  ? ct_nmi_exit+0xd8/0xf0
[   89.646535]  ? irqentry_exit+0x3b/0x50
[   89.646541]  ? rcu_preempt_deferred_qs+0x22/0x90
[   89.646545]  ? ct_kernel_exit.constprop.0+0xa0/0xc0
[   89.646550]  schedule_idle+0x33/0x50
[   89.646555]  do_idle+0x1f3/0x2f0
[   89.646559]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[   89.646564]  ? __pfx_do_idle+0x10/0x10
[   89.646568]  ? swake_up_locked.part.0+0x79/0x90
[   89.646573]  cpu_startup_entry+0x1d/0x20
[   89.646577]  start_secondary+0x1a8/0x1d0
[   89.646582]  ? __pfx_start_secondary+0x10/0x10
[   89.646587]  secondary_startup_64_no_verify+0x178/0x17b
[   89.646595]  </TASK>
[   89.646596] Modules linked in:
[   89.646600] CR2: 0000000000000008
[   89.647328] ---[ end trace 0000000000000000 ]---
[   89.647329] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   89.647330] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.647332] #PF: supervisor read access in kernel mode
[   89.647335] #PF: error_code(0x0000) - not-present page
[   89.647335] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.647339] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.647342] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.647345] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.647346] PGD 0 
[   89.647347] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.647348] P4D 0 
[   89.647350] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.647351] Oops: 0000 [#3] PREEMPT SMP KASAN PTI
[   89.647353] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.647355] CPU: 9 PID: 0 Comm: swapper/9 Tainted: G    B D W          6.5.0+ #127
[   89.647359] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.647359] FS:  0000000000000000(0000) GS:ffff88823ba80000(0000) knlGS:0000000000000000
[   89.647362] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.647361] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.647365] CR2: 0000000000000008 CR3: 0000000144c12000 CR4: 00000000000006e0
[   89.647366] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.647368] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.647370] RSP: 0018:ffffc90000a0f9f8 EFLAGS: 00010082
[   89.647370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.647372] 
[   89.647374] RAX: 0000000000000000 RBX: 1ffff92000141f48 RCX: ffffffffa5a808f7
[   89.647376] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.647377] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.647379] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.647381] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.647386] FS:  0000000000000000(0000) GS:ffff88823bb80000(0000) knlGS:0000000000000000
[   89.647389] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.647391] CR2: 0000000000000008 CR3: 0000000235a64000 CR4: 00000000000006e0
[   89.647392] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.647394] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.647395] Call Trace:
[   89.647397]  <TASK>
[   89.647399]  ? __die_body+0x1f/0x70
[   89.647403]  ? page_fault_oops+0x1f5/0x580
[   89.647407]  ? __pfx_page_fault_oops+0x10/0x10
[   89.647410]  ? is_prefetch.isra.0+0x7a/0x260
[   89.647413]  ? __pfx_is_prefetch.isra.0+0x10/0x10
[   89.647416]  ? __rcu_read_unlock+0x50/0x260
[   89.647419]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.647422]  ? search_bpf_extables+0xb3/0xd0
[   89.647426]  ? fixup_exception+0x3b/0x4e0
[   89.647431]  ? exc_page_fault+0x59/0xb0
[   89.647435]  ? asm_exc_page_fault+0x26/0x30
[   89.647440]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.647442]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.647446]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.647449]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.647452]  ? ring_buffer_lock_reserve+0x25e/0x790
[   89.647455]  ? __pfx_ring_buffer_lock_reserve+0x10/0x10
[   89.647458]  ? kasan_report+0x48/0xf0
[   89.647463]  ? kasan_report+0x48/0xf0
[   89.647468]  trace_event_buffer_lock_reserve+0x145/0x210
[   89.647473]  trace_event_buffer_reserve+0xe2/0x150
[   89.647477]  trace_event_raw_event_sched_switch+0xb3/0x2d0
[   89.647482]  ? ct_nmi_exit+0x82/0xf0
[   89.647484]  ? sched_clock_cpu+0x67/0x2e0
[   89.647488]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.647494]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.647498]  __traceiter_sched_switch+0x59/0x80
[   89.647502]  __schedule+0x72b/0x1580
[   89.647506]  ? _raw_spin_unlock_irqrestore+0x16/0x50
[   89.647511]  ? __pfx___schedule+0x10/0x10
[   89.647515]  ? __pfx_hrtimer_start_range_ns+0x10/0x10
[   89.647519]  ? ct_nmi_exit+0xd8/0xf0
[   89.647522]  ? irqentry_exit+0x3b/0x50
[   89.647527]  ? account_idle_time+0x77/0x90
[   89.647531]  schedule_idle+0x33/0x50
[   89.647535]  do_idle+0x1f3/0x2f0
[   89.647538]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[   89.647542]  ? __pfx_do_idle+0x10/0x10
[   89.647545]  ? swake_up_locked.part.0+0x79/0x90
[   89.647549]  cpu_startup_entry+0x1d/0x20
[   89.647552]  start_secondary+0x1a8/0x1d0
[   89.647556]  ? __pfx_start_secondary+0x10/0x10
[   89.647560]  secondary_startup_64_no_verify+0x178/0x17b
[   89.647566]  </TASK>
[   89.647567] Modules linked in:
[   89.647569] CR2: 0000000000000008
[   89.648173] ---[ end trace 0000000000000000 ]---
[   89.648173] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   89.648174] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.648178] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.648178] #PF: supervisor read access in kernel mode
[   89.648181] #PF: error_code(0x0000) - not-present page
[   89.648181] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.648184] PGD 0 
[   89.648185] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.648186] P4D 0 
[   89.648187] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.648189] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.648189] Oops: 0000 [#4] PREEMPT SMP KASAN PTI
[   89.648191] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.648194] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.648194] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G    B D W          6.5.0+ #127
[   89.648198] FS:  0000000000000000(0000) GS:ffff88823bb80000(0000) knlGS:0000000000000000
[   89.648199] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.648201] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.648203] CR2: 0000000000000008 CR3: 0000000235a64000 CR4: 00000000000006e0
[   89.648201] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.648205] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.648207] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.648208] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.648212] RSP: 0018:ffffc900001c79f8 EFLAGS: 00010082
[   89.648216] RAX: 0000000000000000 RBX: 1ffff92000038f48 RCX: ffffffffa5a808f7
[   89.648219] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.648221] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffff52000038f80
[   89.648223] R10: fffff52000038f7f R11: 0000000000000003 R12: 0000000000000000
[   89.648226] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.648231] FS:  0000000000000000(0000) GS:ffff8880bb480000(0000) knlGS:0000000000000000
[   89.648234] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.648237] CR2: 0000000000000008 CR3: 0000000235a64000 CR4: 00000000000006e0
[   89.648239] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.648241] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.648244] Call Trace:
[   89.648246]  <TASK>
[   89.648248]  ? __die_body+0x1f/0x70
[   89.648253]  ? page_fault_oops+0x1f5/0x580
[   89.648258]  ? __pfx_page_fault_oops+0x10/0x10
[   89.648262]  ? is_prefetch.isra.0+0x7a/0x260
[   89.648266]  ? __pfx_is_prefetch.isra.0+0x10/0x10
[   89.648269]  ? __rcu_read_unlock+0x50/0x260
[   89.648273]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.648277]  ? search_bpf_extables+0xb3/0xd0
[   89.648283]  ? fixup_exception+0x3b/0x4e0
[   89.648289]  ? exc_page_fault+0x59/0xb0
[   89.648294]  ? asm_exc_page_fault+0x26/0x30
[   89.648300]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.648304]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.648308]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.648312]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.648316]  ? __pfx_ring_buffer_lock_reserve+0x10/0x10
[   89.648321]  ? kasan_report+0x48/0xf0
[   89.648327]  ? ring_buffer_unlock_commit+0xfb/0x250
[   89.648330]  ? kasan_report+0x48/0xf0
[   89.648336]  trace_event_buffer_lock_reserve+0x145/0x210
[   89.648342]  trace_event_buffer_reserve+0xe2/0x150
[   89.648347]  trace_event_raw_event_sched_switch+0xb3/0x2d0
[   89.648352]  ? strncpy+0x33/0x60
[   89.648358]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.648363]  ? __pfx_trace_save_cmdline+0x10/0x10
[   89.648371]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.648375]  __traceiter_sched_switch+0x59/0x80
[   89.648381]  __schedule+0x72b/0x1580
[   89.648386]  ? _raw_spin_unlock_irqrestore+0x16/0x50
[   89.648392]  ? __pfx___schedule+0x10/0x10
[   89.648397]  ? ct_nmi_exit+0xd8/0xf0
[   89.648401]  ? irqentry_exit+0x3b/0x50
[   89.648407]  ? nr_iowait_cpu+0x46/0x60
[   89.648412]  ? tick_nohz_stop_idle+0x86/0xc0
[   89.648417]  schedule_idle+0x33/0x50
[   89.648422]  do_idle+0x1f3/0x2f0
[   89.648426]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[   89.648431]  ? __pfx_do_idle+0x10/0x10
[   89.648435]  ? swake_up_locked.part.0+0x79/0x90
[   89.648441]  cpu_startup_entry+0x1d/0x20
[   89.648445]  start_secondary+0x1a8/0x1d0
[   89.648450]  ? __pfx_start_secondary+0x10/0x10
[   89.648455]  secondary_startup_64_no_verify+0x178/0x17b
[   89.648463]  </TASK>
[   89.648464] Modules linked in:
[   89.648466] CR2: 0000000000000008
[   89.649210] ---[ end trace 0000000000000000 ]---
[   89.649211] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   89.649212] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.649215] #PF: supervisor read access in kernel mode
[   89.649217] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.649218] #PF: error_code(0x0000) - not-present page
[   89.649221] PGD 0 
[   89.649220] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.649222] P4D 0 
[   89.649223] 
[   89.649224] 
[   89.649225] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.649226] Oops: 0000 [#5] PREEMPT SMP KASAN PTI
[   89.649228] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.649230] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.649231] CPU: 11 PID: 169 Comm: systemd-journal Tainted: G    B D W          6.5.0+ #127
[   89.649232] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.649235] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.649236] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[   89.649241] FS:  0000000000000000(0000) GS:ffff8880bb480000(0000) knlGS:0000000000000000
[   89.649239] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.649244] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.649245] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.649247] CR2: 0000000000000008 CR3: 0000000235a64000 CR4: 00000000000006e0
[   89.649250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.649249] RSP: 0018:ffffc90001d2f7e8 EFLAGS: 00010086
[   89.649252] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.649253] 
[   89.649254] RAX: 0000000000000000 RBX: 1ffff920003a5f06 RCX: ffffffffa5a808f7
[   89.649258] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.649260] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.649263] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.649265] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.649272] FS:  00007f70b7c81980(0000) GS:ffff88823bc80000(0000) knlGS:0000000000000000
[   89.649275] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.649278] CR2: 0000000000000008 CR3: 000000014bf78000 CR4: 00000000000006e0
[   89.649280] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.649282] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.649285] Call Trace:
[   89.649286]  <TASK>
[   89.649288]  ? __die_body+0x1f/0x70
[   89.649294]  ? page_fault_oops+0x1f5/0x580
[   89.649299]  ? __pfx_page_fault_oops+0x10/0x10
[   89.649302]  ? is_prefetch.isra.0+0x7a/0x260
[   89.649306]  ? __pfx_is_prefetch.isra.0+0x10/0x10
[   89.649310]  ? __rcu_read_unlock+0x50/0x260
[   89.649314]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.649318]  ? search_bpf_extables+0xb3/0xd0
[   89.649324]  ? fixup_exception+0x3b/0x4e0
[   89.649329]  ? exc_page_fault+0x59/0xb0
[   89.649335]  ? asm_exc_page_fault+0x26/0x30
[   89.649341]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.649345]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.649349]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.649353]  ? ring_buffer_lock_reserve+0x97/0x790
[   89.649357]  ? __pfx_sched_clock_cpu+0x10/0x10
[   89.649362]  ? do_syscall_64+0x3f/0x90
[   89.649366]  ? record_times+0x8b/0xd0
[   89.649370]  ? __pfx_ring_buffer_lock_reserve+0x10/0x10
[   89.649374]  ? kasan_report+0x48/0xf0
[   89.649379]  ? __pfx_load_balance+0x10/0x10
[   89.649385]  ? kasan_report+0x48/0xf0
[   89.649389]  ? sched_clock+0x10/0x30
[   89.649395]  ? sched_clock_cpu+0x67/0x2e0
[   89.649400]  trace_event_buffer_lock_reserve+0x145/0x210
[   89.649406]  trace_event_buffer_reserve+0xe2/0x150
[   89.649412]  trace_event_raw_event_sched_switch+0xb3/0x2d0
[   89.649418]  ? sched_clock_cpu+0x67/0x2e0
[   89.649422]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.649429]  ? __pfx_trace_event_raw_event_sched_switch+0x10/0x10
[   89.649434]  __traceiter_sched_switch+0x59/0x80
[   89.649440]  __schedule+0x72b/0x1580
[   89.649446]  ? __pfx___schedule+0x10/0x10
[   89.649452]  ? stack_trace_save+0x95/0xd0
[   89.649459]  ? futex_wait_setup+0xbe/0x150
[   89.649465]  ? plist_add+0x14c/0x180
[   89.649472]  schedule+0x92/0x120
[   89.649477]  futex_wait_queue+0x87/0xc0
[   89.649482]  futex_wait+0x219/0x3a0
[   89.649488]  ? do_syscall_64+0x3f/0x90
[   89.649492]  ? __pfx_futex_wait+0x10/0x10
[   89.649499]  ? __virt_addr_valid+0xf9/0x180
[   89.649507]  ? trace_hardirqs_on+0x27/0xc0
[   89.649513]  do_futex+0x198/0x230
[   89.649518]  ? __pfx_do_futex+0x10/0x10
[   89.649524]  __x64_sys_futex+0x106/0x290
[   89.649530]  ? __pfx___x64_sys_futex+0x10/0x10
[   89.649535]  ? do_sys_open+0x8e/0xf0
[   89.649542]  do_syscall_64+0x3f/0x90
[   89.649546]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[   89.649552] RIP: 0033:0x7f70b8490cd7
[   89.649555] Code: 52 fe ff ff 0f 1f 80 00 00 00 00 bb ca 00 00 00 eb 20 90 e8 7b 93 00 00 45 31 d2 44 89 e2 31 f6 41 89 c0 4c 89 ef 89 d8 0f 05 <44> 89 c7 e8 c1 93 00 00 45 8b 65 00 45 85 e4 75 d8 eb b6 66 0f 1f
[   89.649559] RSP: 002b:00007fffce6df9c0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[   89.649564] RAX: ffffffffffffffda RBX: 00000000000000ca RCX: 00007f70b8490cd7
[   89.649566] RDX: 00000000000001bb RSI: 0000000000000000 RDI: 00007f70b7c809d0
[   89.649568] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffce6dfba8
[   89.649570] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000001bb
[   89.649572] R13: 00007f70b7c809d0 R14: 000055e4be93fc90 R15: 00007f70b7c80700
[   89.649578]  </TASK>
[   89.649579] Modules linked in:
[   89.649581] CR2: 0000000000000008
[   89.650344] ---[ end trace 0000000000000000 ]---
[   89.650346] RIP: 0010:ring_buffer_lock_reserve+0x97/0x790
[   89.650351] Code: 48 89 84 24 e0 00 00 00 31 c0 65 ff 05 2a 86 5b 5a 48 8d 6f 08 be 04 00 00 00 48 89 ef e8 b1 1d 23 00 48 89 ef e8 59 09 23 00 <45> 8b 74 24 08 45 85 f6 0f 85 a0 02 00 00 65 8b 2d 00 86 5b 5a 41
[   89.650354] RSP: 0018:ffffc900001879f8 EFLAGS: 00010082
[   89.650357] RAX: 0000000000000000 RBX: 1ffff92000030f48 RCX: ffffffffa5a808f7
[   89.650360] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000008
[   89.650361] RBP: 0000000000000008 R08: ffffffffa5a808f7 R09: fffffbfff50e2e1b
[   89.650364] R10: fffffbfff50e2e1a R11: ffffffffa87170d7 R12: 0000000000000000
[   89.650366] R13: 0000000000000040 R14: 0000000000000040 R15: 0000000000000000
[   89.650371] FS:  00007f70b7c81980(0000) GS:ffff88823bc80000(0000) knlGS:0000000000000000
[   89.650374] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.650377] CR2: 0000000000000008 CR3: 000000014bf78000 CR4: 00000000000006e0
[   89.650379] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   89.650381] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   89.650384] note: systemd-journal[169] exited with irqs disabled
[   90.684878] Shutting down cpus with NMI
[   91.022097] Kernel Offset: 0x24800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[   91.023759] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---