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Message-Id: <706035F7-73F8-47B5-B067-87E04F1EE786@lca.pw>
Date: Thu, 16 Jan 2020 12:55:04 -0500
From: Qian Cai <cai@....pw>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Dmitriy Vyukov <dvyukov@...gle.com>,
kasan-dev <kasan-dev@...glegroups.com>,
LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH -rcu] kcsan: Make KCSAN compatible with lockdep
> On Jan 16, 2020, at 12:50 PM, Qian Cai <cai@....pw> wrote:
>
>
>
>> On Jan 16, 2020, at 12:40 PM, Paul E. McKenney <paulmck@...nel.org> wrote:
>>
>> On Wed, Jan 15, 2020 at 11:37:47PM -0500, Qian Cai wrote:
>>>
>>>> On Jan 15, 2020, at 10:39 PM, Qian Cai <cai@....pw> wrote:
>>>>> On Jan 15, 2020, at 11:37 AM, Paul E. McKenney <paulmck@...nel.org> wrote:
>>>>> On Wed, Jan 15, 2020 at 05:26:55PM +0100, Marco Elver wrote:
>>>>>> On Tue, 14 Jan 2020 at 18:24, Alexander Potapenko <glider@...gle.com> wrote:
>>>>>>>
>>>>>>>> --- a/kernel/kcsan/core.c
>>>>>>>> +++ b/kernel/kcsan/core.c
>>>>>>>> @@ -337,7 +337,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
>>>>>>>> * detection point of view) to simply disable preemptions to ensure
>>>>>>>> * as many tasks as possible run on other CPUs.
>>>>>>>> */
>>>>>>>> - local_irq_save(irq_flags);
>>>>>>>> + raw_local_irq_save(irq_flags);
>>>>>>>
>>>>>>> Please reflect the need to use raw_local_irq_save() in the comment.
>>>>>>>
>>>>>>>>
>>>>>>>> watchpoint = insert_watchpoint((unsigned long)ptr, size, is_write);
>>>>>>>> if (watchpoint == NULL) {
>>>>>>>> @@ -429,7 +429,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
>>>>>>>>
>>>>>>>> kcsan_counter_dec(KCSAN_COUNTER_USED_WATCHPOINTS);
>>>>>>>> out_unlock:
>>>>>>>> - local_irq_restore(irq_flags);
>>>>>>>> + raw_local_irq_restore(irq_flags);
>>>>>>>
>>>>>>> Ditto
>>>>>>
>>>>>> Done. v2: http://lkml.kernel.org/r/20200115162512.70807-1-elver@google.com
>>>>>
>>>>> Alexander and Qian, could you please let me know if this fixes things
>>>>> up for you?
>>>>
>>>> The lockdep warning is gone, so feel free to add,
>>>>
>>>> Tested-by: Qian Cai <cai@....pw>
>>>>
>>>> for that patch, but the system is still unable to boot due to spam of
>>>> warnings due to incompatible with debug_pagealloc, debugobjects, so
>>>> the warning rate limit does not help.
>>>
>>> I set CONFIG_DEBUG_OBJECTS=n to see how further it could go, but
>>> the kernel is dead after those lines. Unable to boot any further.
>>
>> How large a system are you running on? The reason that I ask is that I
>> have been running it on a 12-CPU system with and without lockdep for some
>> time. So perhaps you are running this on a large system (thus indicating
>> a need for better scalability) or are using an additional Kconfig option?
>
> The system has 64 CPUs with additional debug options enabled,
>
> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
Forgot to mention, just deselect KASAN and select KCSAN there to reproduce.
>
>>
>>> …
>>> [ 111.345991][ T789] Reported by Kernel Concurrency Sanitizer on:
>>> [ 111.373039][ T789] CPU: 44 PID: 789 Comm: systemd-udevd Not tainted 5.5.0-rc6-next-20200115+ #4
>>> [ 111.414596][ T789] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>> [ 111.459984][ T789] ==================================================================
>>> [ 111.554563][ T777] ==================================================================
>>> [ 111.590304][ T777] BUG: KCSAN: data-race in __change_page_attr / __change_page_attr
>>> [ 111.626392][ T777]
>>> [ 111.636881][ T777] write to 0xffffffff9a19cde0 of 8 bytes by task 796 on cpu 1:
>>> [ 111.671544][ T777] __change_page_attr+0xe9c/0x1620
>>> [ 111.695067][ T777] __change_page_attr_set_clr+0xde/0x4c0
>>> [ 111.722124][ T777] __set_pages_p+0xcc/0x100
>>> [ 111.742644][ T777] __kernel_map_pages+0x2e/0xdb
>>> [ 111.765379][ T777] prep_new_page+0x87/0x1f0
>>> [ 111.785804][ T777] get_page_from_freelist+0x1583/0x22b0
>>> [ 111.810633][ T777] __alloc_pages_nodemask+0x1b1/0x450
>>> [ 111.835196][ T777] alloc_pages_current+0xa6/0x120
>>> [ 111.858619][ T777] __vmalloc_node_range+0x338/0x480
>>> [ 111.882253][ T777] __vmalloc_node.constprop.29+0x70/0xb0
>>> [ 111.908550][ T777] vmalloc+0x69/0x80
>>> [ 111.927150][ T777] kernel_read_file+0x241/0x2b0
>>> [ 111.950372][ T777] kernel_read_file_from_fd+0x56/0x90
>>> [ 111.976025][ T777] __do_sys_finit_module+0xc7/0x190
>>> [ 111.999847][ T777] __x64_sys_finit_module+0x4c/0x60
>>> [ 112.023326][ T777] do_syscall_64+0x91/0xb47
>>> [ 112.043903][ T777] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>> [ 112.070954][ T777]
>>> [ 112.081261][ T777] read to 0xffffffff9a19cde0 of 8 bytes by task 777 on cpu 16:
>>> [ 112.115510][ T777] __change_page_attr+0xe81/0x1620
>>> [ 112.138564][ T777] __change_page_attr_set_clr+0xde/0x4c0
>>> [ 112.164452][ T777] __set_pages_p+0xcc/0x100
>>> [ 112.185228][ T777] __kernel_map_pages+0x2e/0xdb
>>> [ 112.207122][ T777] prep_new_page+0x87/0x1f0
>>> [ 112.227507][ T777] get_page_from_freelist+0x1583/0x22b0
>>> [ 112.252947][ T777] __alloc_pages_nodemask+0x1b1/0x450
>>> [ 112.277504][ T777] alloc_pages_current+0xa6/0x120
>>> [ 112.300450][ T777] alloc_slab_page+0x3b1/0x540
>>> [ 112.322039][ T777] allocate_slab+0x70/0x660
>>> [ 112.342387][ T777] new_slab+0x46/0x70
>>> [ 112.360102][ T777] ___slab_alloc+0x4ad/0x7d0
>>> [ 112.380944][ T777] __slab_alloc+0x43/0x70
>>> [ 112.400596][ T777] kmem_cache_alloc+0x2c3/0x420
>>> [ 112.423674][ T777] create_object+0x69/0x690
>>> [ 112.447347][ T777] kmemleak_alloc+0x7d/0xb0
>>> [ 112.469100][ T777] __kmalloc_track_caller+0x157/0x3c0
>>> [ 112.493548][ T777] kstrdup+0x3d/0x70
>>> [ 112.510959][ T777] mod_sysfs_setup+0x5e5/0xb10
>>> [ 112.532234][ T777] load_module+0x2510/0x2b60
>>> [ 112.552985][ T777] __do_sys_finit_module+0x14d/0x190
>>> [ 112.577212][ T777] __x64_sys_finit_module+0x4c/0x60
>>> [ 112.601135][ T777] do_syscall_64+0x91/0xb47
>>> [ 112.621690][ T777] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>> [ 112.648566][ T777]
>>> [ 112.659018][ T777] Reported by Kernel Concurrency Sanitizer on:
>>> [ 112.687603][ T777] CPU: 16 PID: 777 Comm: systemd-udevd Not tainted 5.5.0-rc6-next-20200115+ #4
>>> [ 112.729082][ T777] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>> [ 112.772563][ T777] ==================================================================
>>> [ 112.810304][ T364] ==================================================================
>>> [ 112.848145][ T364] BUG: KCSAN: data-race in __change_page_attr / __change_page_attr
>>> [ 112.884579][ T364]
>>> [ 112.884586][ T364] read to 0xffffffff9a19cde0 of 8 bytes by task 789 on cpu 12:
>>> [ 112.884595][ T364] __change_page_attr+0xe81/0x1620
>>> [ 112.884602][ T364] __change_page_attr_set_clr+0xde/0x4c0
>>> [ 112.884607][ T364] __set_pages_p+0xcc/0x100
>>> [ 112.884612][ T364] __kernel_map_pages+0x2e/0xdb
>>> [ 112.884619][ T364] prep_new_page+0x87/0x1f0
>>> [ 112.884627][ T364] get_page_from_freelist+0x1583/0x22b0
>>> [ 112.884633][ T364] __alloc_pages_nodemask+0x1b1/0x450
>>> [ 112.884640][ T364] alloc_pages_vma+0x8a/0x2c0
>>> [ 112.884646][ T364] wp_page_copy+0x100/0x930
>>> Starting Show Pl[ 112.884653][ T364] do_wp_page+0x107/0x7b0
>>> [ 112.884660][ T364] __handle_mm_fault+0xce6/0xd40
>>> [ 112.884667][ T364] handle_mm_fault+0xfc/0x2f0
>>> [ 112.884677][ T364] do_page_fault+0x263/0x6f9
>>> ymouth Boot Screen...
>>> perf: interrupt took too long (7468 > 7338), lowering kernel.perf_event_max_sample_rate to 26700
>>> perf: interrupt took too long (9463 > 9335), lowering kernel.perf_event_max_sample_rate to 21100
>>>
>>>>
>>>> [ 28.992752][ T394] Reported by Kernel Concurrency Sanitizer on:
>>>> [ 28.992752][ T394] CPU: 0 PID: 394 Comm: pgdatinit0 Not tainted 5.5.0-rc6-next-20200115+ #3
>>>> [ 28.992752][ T394] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>>> [ 28.992752][ T394] ===============================================================
>>>> [ 28.992752][ T394] ==================================================================
>>>> [ 28.992752][ T394] BUG: KCSAN: data-race in __change_page_attr / __change_page_attr
>>>> [ 28.992752][ T394]
>>>> [ 28.992752][ T394] read to 0xffffffffa01a6de0 of 8 bytes by task 395 on cpu 16:
>>>> [ 28.992752][ T394] __change_page_attr+0xe81/0x1620
>>>> [ 28.992752][ T394] __change_page_attr_set_clr+0xde/0x4c0
>>>> [ 28.992752][ T394] __set_pages_np+0xcc/0x100
>>>> [ 28.992752][ T394] __kernel_map_pages+0xd6/0xdb
>>>> [ 28.992752][ T394] __free_pages_ok+0x1a8/0x730
>>>> [ 28.992752][ T394] __free_pages+0x51/0x90
>>>> [ 28.992752][ T394] __free_pages_core+0x1c7/0x2c0
>>>> [ 28.992752][ T394] deferred_free_range+0x59/0x8f
>>>> [ 28.992752][ T394] deferred_init_max21d
>>>> [ 28.992752][ T394] deferred_init_memmap+0x14a/0x1c1
>>>> [ 28.992752][ T394] kthread+0x1e0/0x200
>>>> [ 28.992752][ T394] ret_from_fork+0x3a/0x50
>>>> [ 28.992752][ T394]
>>>> [ 28.992752][ T394] write to 0xffffffffa01a6de0 of 8 bytes by task 394 on cpu 0:
>>>> [ 28.992752][ T394] __change_page_attr+0xe9c/0x1620
>>>> [ 28.992752][ T394] __change_page_attr_set_clr+0xde/0x4c0
>>>> [ 28.992752][ T394] __set_pages_np+0xcc/0x100
>>>> [ 28.992752][ T394] __kernel_map_pages+0xd6/0xdb
>>>> [ 28.992752][ T394] __free_pages_ok+0x1a8/0x730
>>>> [ 28.992752][ T394] __free_pages+0x51/0x90
>>>> [ 28.992752][ T394] __free_pages_core+0x1c7/0x2c0
>>>> [ 28.992752][ T394] deferred_free_range+0x59/0x8f
>>>> [ 28.992752][ T394] deferred_init_maxorder+0x1d6/0x21d
>>>> [ 28.992752][ T394] deferred_init_memmap+0x14a/0x1c1
>>>> [ 28.992752][ T394] kthread+0x1e0/0x200
>>>> [ 28.992752][ T394] ret_from_fork+0x3a/0x50
>>>>
>>>>
>>>> [ 93.233621][ T349] Reported by Kernel Concurrency Sanitizer on:
>>>> [ 93.261902][ T349] CPU: 19 PID: 349 Comm: kworker/19:1 Not tainted 5.5.0-rc6-next-20200115+ #3
>>>> [ 93.302634][ T349] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>>> [ 93.345413][ T349] Workqueue: memcg_kmem_cache memcg_kmem_cache_create_func
>>>> [ 93.378715][ T349] ==================================================================
>>>> [ 93.416183][ T616] ==================================================================
>>>> [ 93.453415][ T616] BUG: KCSAN: data-race in __debug_object_init / fill_pool
>>>> [ 93.486775][ T616]
>>>> [ 93.497644][ T616] read to 0xffffffff9ff33b78 of 4 bytes by task 617 on cpu 12:
>>>> [ 93.534139][ T616] fill_pool+0x38/0x700
>>>> [ 93.554913][ T616] __debug_object_init+0x3f/0x900
>>>> [ 93.579459][ T616] debug_object_init+0x39/0x50
>>>> [ 93.601952][ T616] __init_work+0x3e/0x50
>>>> [ 93.620611][ T616] memcg_kmem_get_cache+0x3c8/0x480
>>>> [ 93.643619][ T616] slab_pre_alloc_hook+0x5d/0xa0
>>>> [ 93.665134][ T616] __kmalloc_node+0x60/0x300
>>>> [ 93.685094][ T616] kvmalloc_node+0x83/0xa0
>>>> [ 93.704235][ T616] seq_read+0x57c/0x7a0
>>>> [ 93.722460][ T616] proc_reg_read+0x11a/0x160
>>>> [ 93.743570][ T616] __vfs_read+0x59/0xa0
>>>> [ 93.761660][ T616] vfs_read+0xcf/0x1c0
>>>> [ 93.779269][ T616] ksys_read+0x9d/0x130
>>>> [ 93.797267][ T616] __x64_sys_read+0x4c/0x60
>>>> [ 93.817205][ T616] do_syscall_64+0x91/0xb47
>>>> [ 93.837590][ T616] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>>> [ 93.864425][ T616]
>>>> [ 93.874830][ T616] write to 0xffffffff9ff33b78 of 4 bytes by task 616 on cpu 61:
>>>> [ 93.908534][ T616] __debug_object_init+0x6e5/0x900
>>>> [ 93.931018][ T616] debug_object_activate+0x1fc/0x350
>>>> [ 93.954131][ T616] call_rcu+0x4c/0x4e0
>>>> [ 93.971959][ T616] put_object+0x6a/0x90
>>>> [ 93.989955][ T616] __delete_object+0xb9/0xf0
>>>> [ 94.009996][ T616] delete_object_full+0x2d/0x40
>>>> [ 94.031812][ T616] kmemleak_free+0x5f/0x90
>>>> [ 94.054671][ T616] slab_free_freelist_hook+0x124/0x1c0
>>>> [ 94.082027][ T616] kmem_cache_free+0x10c/0x3a0
>>>> [ 94.103806][ T616] vm_area_free+0x31/0x40
>>>> [ 94.124587][ T616] remove_vma+0xb0/0xc0
>>>> [ 94.143484][ T616] exit_mmap+0x14c/0x220
>>>> [ 94.163826][ T616] mmput+0x10e/0x270
>>>> [ 94.181736][ T616] flush_old_exec+0x572/0xfe0
>>>> [ 94.202760][ T616] load_elf_binary+0x467/0x2180
>>>> [ 94.224819][ T616] search_binary_handler+0xd8/0x2b0
>>>> [ 94.248735][ T616] __do_execve_file+0xb61/0x1080
>>>> [ 94.270943][ T616] __x64_sys_execve+0x5f/0x70
>>>> [ 94.292254][ T616] do_syscall_64+0x91/0xb47
>>>> [ 94.312712][ T616] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>>>
>>>> [ 103.455945][ C22] Reported by Kernel Concurrency Sanitizer on:
>>>> [ 103.483032][ C22] CPU: 22 PID: 0 Comm: swapper/22 Not tainted 5.5.0-rc6-next-20200115+ #3
>>>> [ 103.520563][ C22] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>>> [ 103.561771][ C22] ==================================================================
>>>> [ 103.598005][ C41] ==================================================================
>>>> [ 103.633820][ C41] BUG: KCSAN: data-race in intel_pstate_update_util / intel_pstate_update_util
>>>> [ 103.673408][ C41]
>>>> [ 103.683214][ C41] read to 0xffffffffa9098a58 of 2 bytes by interrupt on cpu 2:
>>>> [ 103.716645][ C41] intel_pstate_update_util+0x580/0xb40
>>>> [ 103.740609][ C41] cpufreq_update_util+0xb0/0x160
>>>> [ 103.762611][ C41] update_blocked_averages+0x585/0x630
>>>> [ 103.786435][ C41] run_rebalance_domains+0xd5/0x240
>>>> [ 103.812821][ C41] __do_softirq+0xd9/0x57c
>>>> [ 103.834438][ C41] irq_exit+0xa2/0xc0
>>>> [ 103.851773][ C41] smp_apic_timer_interrupt+0x190/0x480
>>>> [ 103.876005][ C41] apic_timer_interrupt+0xf/0x20
>>>> [ 103.897495][ C41] cpuidle_enter_state+0x18a/0x9b0
>>>> [ 103.919324][ C41] cpuidle_enter+0x69/0xc0
>>>> [ 103.938405][ C41] call_cpuidle+0x23/0x40
>>>> [ 103.957152][ C41] do_idle+0x248/0x280
>>>> [ 103.974728][ C41] cpu_startup_entry+0x1d/0x1f
>>>> [ 103.995059][ C41] start_secondary+0x1ad/0x230
>>>> [ 104.015920][ C41] secondary_startup_64+0xb6/0xc0
>>>> [ 104.037376][ C41]
>>>> [ 104.047144][ C41] write to 0xffffffffa9098a59 of 1 bytes by interrupt on cpu 41:
>>>> [ 104.081113][ C41] intel_pstate_update_util+0x4cf/0xb40
>>>> [ 104.105862][ C41] cpufreq_update_util+0xb0/0x160
>>>> [ 104.127759][ C41] update_load_avg+0x70e/0x800
>>>> [ 104.148400][ C41] task_tick_fair+0x5c/0x680
>>>> [ 104.168325][ C41] scheduler_tick+0xab/0x120
>>>> [ 104.188881][ C41] update_process_times+0x44/0x60
>>>> [ 104.210811][ C41] tick_sched_handle+0x4f/0xb0
>>>> [ 104.231137][ C41] tick_sched_timer+0x45/0xc0
>>>> [ 104.251431][ C41] __hrtimer_run_queues+0x243/0x800
>>>> [ 104.274362][ C41] hrtimer_interrupt+0x1d4/0x3e0
>>>> [ 104.295860][ C41] smp_apic_timer_interrupt+0x11d/0x480
>>>> [ 104.325136][ C41] apic_timer_interrupt+0xf/0x20
>>>> [ 104.347864][ C41] __kcsan_check_access+0x1a/0x120
>>>> [ 104.370100][ C41] __read_once_size+0x1f/0xe0
>>>> [ 104.390064][ C41] smp_call_function_many+0x4b0/0x5d0
>>>> [ 104.413591][ C41] on_each_cpu+0x46/0x90
>>>> [ 104.431954][ C41] flush_tlb_kernel_range+0x97/0xc0
>>>> [ 104.454702][ C41] free_unmap_vmap_area+0xaa/0xe0
>>>> [ 104.476699][ C41] remove_vm_area+0xf4/0x100
>>>> [ 104.496763][ C41] __vunmap+0x10a/0x460
>>>> [ 104.514807][ C41] __vfree+0x33/0x90
>>>> [ 104.531597][ C41] vfree+0x47/0x80
>>>> [ 104.547600][ C41] n_tty_close+0x56/0x80
>>>> [ 104.565988][ C41] tty_ldisc_close+0x76/0xa0
>>>> [ 104.585912][ C41] tty_ldisc_kill+0x51/0xa0
>>>> [ 104.605864][ C41] tty_ldisc_release+0xf4/0x1a0
>>>> [ 104.627098][ C41] tty_release_struct+0x23/0x60
>>>> [ 104.648268][ C41] tty_release+0x673/0x9c0
>>>> [ 104.667517][ C41] __fput+0x187/0x410
>>>> [ 104.684357][ C41] ____fput+0x1e/0x30
>>>> [ 104.701542][ C41] task_work_run+0xed/0x140
>>>> [ 104.721358][ C41] do_syscall_64+0x803/0xb47
>>>> [ 104.740872][ C41] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>>>
>>>> [ 136.745789][ C34] Reported by Kernel Concurrency Sanitizer on:
>>>> [ 136.774278][ C34] CPU: 34 PID: 0 Comm: swapper/34 Not tainted 5.5.0-rc6-next-20200115+ #3
>>>> [ 136.814948][ C34] Hardware name: HP ProLiant XL230a Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018
>>>> [ 136.861974][ C34] ==================================================================
>>>> [ 136.911354][ T1] ==================================================================
>>>> [ 136.948491][ T1] BUG: KCSAN: data-race in __debug_object_init / fill_pool
>>>> [ 136.981645][ T1]
>>>> [ 136.992045][ T1] read to 0xffffffff9ff33b78 of 4 bytes by task 762 on cpu 25:
>>>> [ 137.026513][ T1] fill_pool+0x38/0x700
>>>> [ 137.045575][ T1] __debug_object_init+0x3f/0x900
>>>> [ 137.068826][ T1] debug_object_activate+0x1fc/0x350
>>>> [ 137.093102][ T1] call_rcu+0x4c/0x4e0
>>>> [ 137.111520][ T1] __fput+0x23a/0x410
>>>> [ 137.129618][ T1] ____fput+0x1e/0x30
>>>> [ 137.147627][ T1] task_work_run+0xed/0x140
>>>> [ 137.168322][ T1] do_syscall_64+0x803/0xb47
>>>> [ 137.188572][ T1] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>>> [ 137.215309][ T1]
>>>> [ 137.225579][ T1] write to 0xffffffff9ff33b78 of 4 bytes by task 1 on cpu 7:
>>>> [ 137.259867][ T1] __debug_object_init+0x6e5/0x900
>>>> [ 137.283065][ T1] debug_object_activate+0x1fc/0x350
>>>> [ 137.306988][ T1] call_rcu+0x4c/0x4e0
>>>> [ 137.326804][ T1] dentry_free+0x70/0xe0
>>>> [ 137.347208][ T1] __dentry_kill+0x1db/0x300
>>>> [ 137.369468][ T1] shrink_dentry_list+0x153/0x2e0
>>>> [ 137.393437][ T1] shrink_dcache_parent+0x1ee/0x320
>>>> [ 137.417174][ T1] d_invalidate+0x80/0x130
>>>> [ 137.437280][ T1] proc_flush_task+0x14c/0x2b0
>>>> [ 137.459263][ T1] release_task.part.21+0x156/0xb50
>>>> [ 137.483580][ T1] wait_consider_task+0x17a8/0x1960
>>>> [ 137.507550][ T1] do_wait+0x25b/0x560
>>>> [ 137.526175][ T1] kernel_waitid+0x194/0x270
>>>> [ 137.547105][ T1] __do_sys_waitid+0x18e/0x1e0
>>>> [ 137.568951][ T1] __x64_sys_waitid+0x70/0x90
>>>> [ 137.590291][ T1] do_syscall_64+0x91/0xb47
>>>> [ 137.610681][ T1] entry_SYSCALL_64_after_hwframe+0x49/0xbe
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