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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id d5sm10545351qke.130.2020.01.16.09.50.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Jan 2020 09:50:58 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.40.2.2.4\)) Subject: Re: [PATCH -rcu] kcsan: Make KCSAN compatible with lockdep From: Qian Cai In-Reply-To: <20200116174004.GU2935@paulmck-ThinkPad-P72> Date: Thu, 16 Jan 2020 12:50:57 -0500 Cc: Marco Elver , Alexander Potapenko , Andrey Konovalov , Dmitriy Vyukov , kasan-dev , LKML , Peter Zijlstra , Ingo Molnar , Will Deacon Content-Transfer-Encoding: quoted-printable Message-Id: <122F8599-1E5A-4F14-B093-0BB99308ED55@lca.pw> References: <20200114124919.11891-1-elver@google.com> <20200115163754.GA2935@paulmck-ThinkPad-P72> <20200116174004.GU2935@paulmck-ThinkPad-P72> To: "Paul E. McKenney" X-Mailer: Apple Mail (2.3608.40.2.2.4) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Jan 16, 2020, at 12:40 PM, Paul E. McKenney = wrote: >=20 > On Wed, Jan 15, 2020 at 11:37:47PM -0500, Qian Cai wrote: >>=20 >>> On Jan 15, 2020, at 10:39 PM, Qian Cai wrote: >>>> On Jan 15, 2020, at 11:37 AM, Paul E. McKenney = wrote: >>>> On Wed, Jan 15, 2020 at 05:26:55PM +0100, Marco Elver wrote: >>>>> On Tue, 14 Jan 2020 at 18:24, Alexander Potapenko = wrote: >>>>>>=20 >>>>>>> --- 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); >>>>>>=20 >>>>>> Please reflect the need to use raw_local_irq_save() in the = comment. >>>>>>=20 >>>>>>>=20 >>>>>>> watchpoint =3D insert_watchpoint((unsigned long)ptr, size, = is_write); >>>>>>> if (watchpoint =3D=3D NULL) { >>>>>>> @@ -429,7 +429,7 @@ kcsan_setup_watchpoint(const volatile void = *ptr, size_t size, int type) >>>>>>>=20 >>>>>>> kcsan_counter_dec(KCSAN_COUNTER_USED_WATCHPOINTS); >>>>>>> out_unlock: >>>>>>> - local_irq_restore(irq_flags); >>>>>>> + raw_local_irq_restore(irq_flags); >>>>>>=20 >>>>>> Ditto >>>>>=20 >>>>> Done. v2: = http://lkml.kernel.org/r/20200115162512.70807-1-elver@google.com >>>>=20 >>>> Alexander and Qian, could you please let me know if this fixes = things >>>> up for you? >>>=20 >>> The lockdep warning is gone, so feel free to add, >>>=20 >>> Tested-by: Qian Cai >>>=20 >>> 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. >>=20 >> I set CONFIG_DEBUG_OBJECTS=3Dn to see how further it could go, but >> the kernel is dead after those lines. Unable to boot any further. >=20 > 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 >=20 >> =E2=80=A6 >> [ 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] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> [ 111.554563][ T777] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> [ 111.590304][ T777] BUG: KCSAN: data-race in __change_page_attr / = __change_page_attr >> [ 111.626392][ T777]=20 >> [ 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]=20 >> [ 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]=20 >> [ 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] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> [ 112.810304][ T364] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> [ 112.848145][ T364] BUG: KCSAN: data-race in __change_page_attr / = __change_page_attr >> [ 112.884579][ T364]=20 >> [ 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 >>=20 >>>=20 >>> [ 28.992752][ T394] Reported by Kernel Concurrency Sanitizer on:=20= >>> [ 28.992752][ T394] CPU: 0 PID: 394 Comm: pgdatinit0 Not tainted = 5.5.0-rc6-next-20200115+ #3=20 >>> [ 28.992752][ T394] Hardware name: HP ProLiant XL230a = Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018=20 >>> [ 28.992752][ T394] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 28.992752][ T394] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 28.992752][ T394] BUG: KCSAN: data-race in __change_page_attr / = __change_page_attr=20 >>> [ 28.992752][ T394] =20 >>> [ 28.992752][ T394] read to 0xffffffffa01a6de0 of 8 bytes by task = 395 on cpu 16:=20 >>> [ 28.992752][ T394] __change_page_attr+0xe81/0x1620=20 >>> [ 28.992752][ T394] __change_page_attr_set_clr+0xde/0x4c0=20 >>> [ 28.992752][ T394] __set_pages_np+0xcc/0x100=20 >>> [ 28.992752][ T394] __kernel_map_pages+0xd6/0xdb=20 >>> [ 28.992752][ T394] __free_pages_ok+0x1a8/0x730=20 >>> [ 28.992752][ T394] __free_pages+0x51/0x90=20 >>> [ 28.992752][ T394] __free_pages_core+0x1c7/0x2c0=20 >>> [ 28.992752][ T394] deferred_free_range+0x59/0x8f=20 >>> [ 28.992752][ T394] deferred_init_max21d=20 >>> [ 28.992752][ T394] deferred_init_memmap+0x14a/0x1c1=20 >>> [ 28.992752][ T394] kthread+0x1e0/0x200=20 >>> [ 28.992752][ T394] ret_from_fork+0x3a/0x50=20 >>> [ 28.992752][ T394] =20 >>> [ 28.992752][ T394] write to 0xffffffffa01a6de0 of 8 bytes by = task 394 on cpu 0:=20 >>> [ 28.992752][ T394] __change_page_attr+0xe9c/0x1620=20 >>> [ 28.992752][ T394] __change_page_attr_set_clr+0xde/0x4c0=20 >>> [ 28.992752][ T394] __set_pages_np+0xcc/0x100=20 >>> [ 28.992752][ T394] __kernel_map_pages+0xd6/0xdb=20 >>> [ 28.992752][ T394] __free_pages_ok+0x1a8/0x730=20 >>> [ 28.992752][ T394] __free_pages+0x51/0x90=20 >>> [ 28.992752][ T394] __free_pages_core+0x1c7/0x2c0=20 >>> [ 28.992752][ T394] deferred_free_range+0x59/0x8f=20 >>> [ 28.992752][ T394] deferred_init_maxorder+0x1d6/0x21d=20 >>> [ 28.992752][ T394] deferred_init_memmap+0x14a/0x1c1=20 >>> [ 28.992752][ T394] kthread+0x1e0/0x200=20 >>> [ 28.992752][ T394] ret_from_fork+0x3a/0x50=20 >>>=20 >>>=20 >>> [ 93.233621][ T349] Reported by Kernel Concurrency Sanitizer on:=20= >>> [ 93.261902][ T349] CPU: 19 PID: 349 Comm: kworker/19:1 Not = tainted 5.5.0-rc6-next-20200115+ #3=20 >>> [ 93.302634][ T349] Hardware name: HP ProLiant XL230a = Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018=20 >>> [ 93.345413][ T349] Workqueue: memcg_kmem_cache = memcg_kmem_cache_create_func=20 >>> [ 93.378715][ T349] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 93.416183][ T616] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 93.453415][ T616] BUG: KCSAN: data-race in __debug_object_init = / fill_pool=20 >>> [ 93.486775][ T616] =20 >>> [ 93.497644][ T616] read to 0xffffffff9ff33b78 of 4 bytes by task = 617 on cpu 12:=20 >>> [ 93.534139][ T616] fill_pool+0x38/0x700=20 >>> [ 93.554913][ T616] __debug_object_init+0x3f/0x900=20 >>> [ 93.579459][ T616] debug_object_init+0x39/0x50=20 >>> [ 93.601952][ T616] __init_work+0x3e/0x50=20 >>> [ 93.620611][ T616] memcg_kmem_get_cache+0x3c8/0x480=20 >>> [ 93.643619][ T616] slab_pre_alloc_hook+0x5d/0xa0=20 >>> [ 93.665134][ T616] __kmalloc_node+0x60/0x300=20 >>> [ 93.685094][ T616] kvmalloc_node+0x83/0xa0=20 >>> [ 93.704235][ T616] seq_read+0x57c/0x7a0=20 >>> [ 93.722460][ T616] proc_reg_read+0x11a/0x160=20 >>> [ 93.743570][ T616] __vfs_read+0x59/0xa0=20 >>> [ 93.761660][ T616] vfs_read+0xcf/0x1c0=20 >>> [ 93.779269][ T616] ksys_read+0x9d/0x130=20 >>> [ 93.797267][ T616] __x64_sys_read+0x4c/0x60=20 >>> [ 93.817205][ T616] do_syscall_64+0x91/0xb47=20 >>> [ 93.837590][ T616] entry_SYSCALL_64_after_hwframe+0x49/0xbe=20 >>> [ 93.864425][ T616] =20 >>> [ 93.874830][ T616] write to 0xffffffff9ff33b78 of 4 bytes by = task 616 on cpu 61:=20 >>> [ 93.908534][ T616] __debug_object_init+0x6e5/0x900=20 >>> [ 93.931018][ T616] debug_object_activate+0x1fc/0x350=20 >>> [ 93.954131][ T616] call_rcu+0x4c/0x4e0=20 >>> [ 93.971959][ T616] put_object+0x6a/0x90=20 >>> [ 93.989955][ T616] __delete_object+0xb9/0xf0=20 >>> [ 94.009996][ T616] delete_object_full+0x2d/0x40=20 >>> [ 94.031812][ T616] kmemleak_free+0x5f/0x90=20 >>> [ 94.054671][ T616] slab_free_freelist_hook+0x124/0x1c0=20 >>> [ 94.082027][ T616] kmem_cache_free+0x10c/0x3a0=20 >>> [ 94.103806][ T616] vm_area_free+0x31/0x40=20 >>> [ 94.124587][ T616] remove_vma+0xb0/0xc0=20 >>> [ 94.143484][ T616] exit_mmap+0x14c/0x220=20 >>> [ 94.163826][ T616] mmput+0x10e/0x270=20 >>> [ 94.181736][ T616] flush_old_exec+0x572/0xfe0=20 >>> [ 94.202760][ T616] load_elf_binary+0x467/0x2180=20 >>> [ 94.224819][ T616] search_binary_handler+0xd8/0x2b0=20 >>> [ 94.248735][ T616] __do_execve_file+0xb61/0x1080=20 >>> [ 94.270943][ T616] __x64_sys_execve+0x5f/0x70=20 >>> [ 94.292254][ T616] do_syscall_64+0x91/0xb47=20 >>> [ 94.312712][ T616] entry_SYSCALL_64_after_hwframe+0x49/0xbe=20 >>>=20 >>> [ 103.455945][ C22] Reported by Kernel Concurrency Sanitizer on:=20= >>> [ 103.483032][ C22] CPU: 22 PID: 0 Comm: swapper/22 Not tainted = 5.5.0-rc6-next-20200115+ #3=20 >>> [ 103.520563][ C22] Hardware name: HP ProLiant XL230a = Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018=20 >>> [ 103.561771][ C22] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 103.598005][ C41] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 103.633820][ C41] BUG: KCSAN: data-race in = intel_pstate_update_util / intel_pstate_update_util=20 >>> [ 103.673408][ C41] =20 >>> [ 103.683214][ C41] read to 0xffffffffa9098a58 of 2 bytes by = interrupt on cpu 2:=20 >>> [ 103.716645][ C41] intel_pstate_update_util+0x580/0xb40=20 >>> [ 103.740609][ C41] cpufreq_update_util+0xb0/0x160=20 >>> [ 103.762611][ C41] update_blocked_averages+0x585/0x630=20 >>> [ 103.786435][ C41] run_rebalance_domains+0xd5/0x240=20 >>> [ 103.812821][ C41] __do_softirq+0xd9/0x57c=20 >>> [ 103.834438][ C41] irq_exit+0xa2/0xc0=20 >>> [ 103.851773][ C41] smp_apic_timer_interrupt+0x190/0x480=20 >>> [ 103.876005][ C41] apic_timer_interrupt+0xf/0x20=20 >>> [ 103.897495][ C41] cpuidle_enter_state+0x18a/0x9b0=20 >>> [ 103.919324][ C41] cpuidle_enter+0x69/0xc0=20 >>> [ 103.938405][ C41] call_cpuidle+0x23/0x40=20 >>> [ 103.957152][ C41] do_idle+0x248/0x280=20 >>> [ 103.974728][ C41] cpu_startup_entry+0x1d/0x1f=20 >>> [ 103.995059][ C41] start_secondary+0x1ad/0x230=20 >>> [ 104.015920][ C41] secondary_startup_64+0xb6/0xc0=20 >>> [ 104.037376][ C41] =20 >>> [ 104.047144][ C41] write to 0xffffffffa9098a59 of 1 bytes by = interrupt on cpu 41:=20 >>> [ 104.081113][ C41] intel_pstate_update_util+0x4cf/0xb40=20 >>> [ 104.105862][ C41] cpufreq_update_util+0xb0/0x160=20 >>> [ 104.127759][ C41] update_load_avg+0x70e/0x800=20 >>> [ 104.148400][ C41] task_tick_fair+0x5c/0x680=20 >>> [ 104.168325][ C41] scheduler_tick+0xab/0x120=20 >>> [ 104.188881][ C41] update_process_times+0x44/0x60=20 >>> [ 104.210811][ C41] tick_sched_handle+0x4f/0xb0=20 >>> [ 104.231137][ C41] tick_sched_timer+0x45/0xc0=20 >>> [ 104.251431][ C41] __hrtimer_run_queues+0x243/0x800=20 >>> [ 104.274362][ C41] hrtimer_interrupt+0x1d4/0x3e0=20 >>> [ 104.295860][ C41] smp_apic_timer_interrupt+0x11d/0x480=20 >>> [ 104.325136][ C41] apic_timer_interrupt+0xf/0x20=20 >>> [ 104.347864][ C41] __kcsan_check_access+0x1a/0x120=20 >>> [ 104.370100][ C41] __read_once_size+0x1f/0xe0=20 >>> [ 104.390064][ C41] smp_call_function_many+0x4b0/0x5d0=20 >>> [ 104.413591][ C41] on_each_cpu+0x46/0x90=20 >>> [ 104.431954][ C41] flush_tlb_kernel_range+0x97/0xc0=20 >>> [ 104.454702][ C41] free_unmap_vmap_area+0xaa/0xe0=20 >>> [ 104.476699][ C41] remove_vm_area+0xf4/0x100=20 >>> [ 104.496763][ C41] __vunmap+0x10a/0x460=20 >>> [ 104.514807][ C41] __vfree+0x33/0x90=20 >>> [ 104.531597][ C41] vfree+0x47/0x80=20 >>> [ 104.547600][ C41] n_tty_close+0x56/0x80=20 >>> [ 104.565988][ C41] tty_ldisc_close+0x76/0xa0=20 >>> [ 104.585912][ C41] tty_ldisc_kill+0x51/0xa0=20 >>> [ 104.605864][ C41] tty_ldisc_release+0xf4/0x1a0=20 >>> [ 104.627098][ C41] tty_release_struct+0x23/0x60=20 >>> [ 104.648268][ C41] tty_release+0x673/0x9c0=20 >>> [ 104.667517][ C41] __fput+0x187/0x410=20 >>> [ 104.684357][ C41] ____fput+0x1e/0x30=20 >>> [ 104.701542][ C41] task_work_run+0xed/0x140=20 >>> [ 104.721358][ C41] do_syscall_64+0x803/0xb47=20 >>> [ 104.740872][ C41] entry_SYSCALL_64_after_hwframe+0x49/0xbe >>>=20 >>> [ 136.745789][ C34] Reported by Kernel Concurrency Sanitizer on:=20= >>> [ 136.774278][ C34] CPU: 34 PID: 0 Comm: swapper/34 Not tainted = 5.5.0-rc6-next-20200115+ #3=20 >>> [ 136.814948][ C34] Hardware name: HP ProLiant XL230a = Gen9/ProLiant XL230a Gen9, BIOS U13 01/22/2018=20 >>> [ 136.861974][ C34] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 136.911354][ T1] = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 >>> [ 136.948491][ T1] BUG: KCSAN: data-race in __debug_object_init = / fill_pool=20 >>> [ 136.981645][ T1] =20 >>> [ 136.992045][ T1] read to 0xffffffff9ff33b78 of 4 bytes by task = 762 on cpu 25:=20 >>> [ 137.026513][ T1] fill_pool+0x38/0x700=20 >>> [ 137.045575][ T1] __debug_object_init+0x3f/0x900=20 >>> [ 137.068826][ T1] debug_object_activate+0x1fc/0x350=20 >>> [ 137.093102][ T1] call_rcu+0x4c/0x4e0=20 >>> [ 137.111520][ T1] __fput+0x23a/0x410=20 >>> [ 137.129618][ T1] ____fput+0x1e/0x30=20 >>> [ 137.147627][ T1] task_work_run+0xed/0x140=20 >>> [ 137.168322][ T1] do_syscall_64+0x803/0xb47=20 >>> [ 137.188572][ T1] entry_SYSCALL_64_after_hwframe+0x49/0xbe=20 >>> [ 137.215309][ T1] =20 >>> [ 137.225579][ T1] write to 0xffffffff9ff33b78 of 4 bytes by = task 1 on cpu 7:=20 >>> [ 137.259867][ T1] __debug_object_init+0x6e5/0x900=20 >>> [ 137.283065][ T1] debug_object_activate+0x1fc/0x350=20 >>> [ 137.306988][ T1] call_rcu+0x4c/0x4e0=20 >>> [ 137.326804][ T1] dentry_free+0x70/0xe0=20 >>> [ 137.347208][ T1] __dentry_kill+0x1db/0x300=20 >>> [ 137.369468][ T1] shrink_dentry_list+0x153/0x2e0=20 >>> [ 137.393437][ T1] shrink_dcache_parent+0x1ee/0x320=20 >>> [ 137.417174][ T1] d_invalidate+0x80/0x130=20 >>> [ 137.437280][ T1] proc_flush_task+0x14c/0x2b0=20 >>> [ 137.459263][ T1] release_task.part.21+0x156/0xb50=20 >>> [ 137.483580][ T1] wait_consider_task+0x17a8/0x1960=20 >>> [ 137.507550][ T1] do_wait+0x25b/0x560=20 >>> [ 137.526175][ T1] kernel_waitid+0x194/0x270=20 >>> [ 137.547105][ T1] __do_sys_waitid+0x18e/0x1e0=20 >>> [ 137.568951][ T1] __x64_sys_waitid+0x70/0x90=20 >>> [ 137.590291][ T1] do_syscall_64+0x91/0xb47=20 >>> [ 137.610681][ T1] entry_SYSCALL_64_after_hwframe+0x49/0xbe=20