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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fb.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH0PR15MB5117.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7487b96b-0b9d-40dd-e58c-08da142e0acb X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Apr 2022 22:22:00.7751 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: zGFC4es0bva4tVEmqkdpML3mc0V/a2huzPlj4cH8DncULIT7k2Mnmjn6R1P6Y9lCYhIooAxZtkICdfU27DkbPg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB3078 X-Proofpoint-ORIG-GUID: xA0u__kZqQlucLFGVkWrRjXK2tnE6yIu X-Proofpoint-GUID: xA0u__kZqQlucLFGVkWrRjXK2tnE6yIu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.850,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-04-01_07,2022-03-31_01,2022-02-23_01 X-Rspam-User: X-Stat-Signature: mmtkgj4a84rq555e7gjb3uqg85w3swgw Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=fb.com header.s=facebook header.b="eZG/eO6v"; spf=none (imf11.hostedemail.com: domain of "prvs=5090a01ebb=songliubraving@fb.com" has no SPF policy when checking 67.231.153.30) smtp.mailfrom="prvs=5090a01ebb=songliubraving@fb.com"; dmarc=pass (policy=reject) header.from=fb.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 6B7F34001B X-HE-Tag: 1648851747-61864 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: + Nicholas and Claudio, > On Mar 31, 2022, at 4:59 PM, Song Liu wrote: >=20 > Hi Christoph,=20 >=20 >> On Mar 30, 2022, at 10:37 PM, Christoph Hellwig wrot= e: >>=20 >> On Wed, Mar 30, 2022 at 03:56:38PM -0700, Song Liu wrote: >>> We prematurely enabled HAVE_ARCH_HUGE_VMALLOC for x86_64, which could c= ause >>> issues [1], [2]. >>>=20 >>=20 >> Please fix the underlying issues instead of papering over them and >> creating a huge maintainance burden for others. After reading the code a little more, I wonder what would be best strategy.= =20 IIUC, most of the kernel is not ready for huge page backed vmalloc memory. For example, all the module_alloc cannot work with huge pages at the moment= . And the error Paul Menzel reported in drm_fb_helper.c will probably hit=20 powerpc with 5.17 kernel as-is? (trace attached below)=20 Right now, we have VM_NO_HUGE_VMAP to let a user to opt out of huge pages.= =20 However, given there are so many users of vmalloc, vzalloc, etc., we=20 probably do need a flag for the user to opt-in?=20 Does this make sense? Any recommendations are really appreciated.=20 Thanks, Song=20 [ 1.687983] BUG: Bad page state in process systemd-udevd pfn:102e03 [ 1.687992] fbcon: Taking over console [ 1.688007] page:(____ptrval____) refcount:0 mapcount:0 mapping:00000000= 00000000 index:0x3 pfn:0x102e03 [ 1.688011] head:(____ptrval____) order:9 compound_mapcount:0 compound_p= incount:0 [ 1.688013] flags: 0x2fffc000010000(head|node=3D0|zone=3D2|lastcpupid=3D= 0x3fff) [ 1.688018] raw: 002fffc000000000 ffffe815040b8001 ffffe815040b80c8 0000= 000000000000 [ 1.688020] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000= 000000000000 [ 1.688022] head: 002fffc000010000 0000000000000000 dead000000000122 000= 0000000000000 [ 1.688023] head: 0000000000000000 0000000000000000 00000000ffffffff 000= 0000000000000 [ 1.688024] page dumped because: corrupted mapping in tail page [ 1.688025] Modules linked in: r8169(+) k10temp snd_pcm(+) xhci_hcd snd_= timer realtek ohci_hcd ehci_pci(+) i2c_piix4 ehci_hcd radeon(+) snd sg drm_= ttm_helper ttm soundcore coreboot_table acpi_cpufreq fuse ipv6 autofs4 [ 1.688045] CPU: 1 PID: 151 Comm: systemd-udevd Not tainted 5.16.0-11615= -gfac54e2bfb5b #319 [ 1.688048] Hardware name: ASUS F2A85-M_PRO/F2A85-M_PRO, BIOS 4.16-337-g= b87986e67b 03/25/2022 [ 1.688050] Call Trace: [ 1.688051] [ 1.688053] dump_stack_lvl+0x34/0x44 [ 1.688059] bad_page.cold+0x63/0x94 [ 1.688063] free_tail_pages_check+0xd1/0x110 [ 1.688067] ? _raw_spin_lock+0x13/0x30 [ 1.688071] free_pcp_prepare+0x251/0x2e0 [ 1.688075] free_unref_page+0x1d/0x110 [ 1.688078] __vunmap+0x28a/0x380 [ 1.688082] drm_fbdev_cleanup+0x5f/0xb0 [ 1.688085] drm_fbdev_fb_destroy+0x15/0x30 [ 1.688087] unregister_framebuffer+0x1d/0x30 [ 1.688091] drm_client_dev_unregister+0x69/0xe0 [ 1.688095] drm_dev_unregister+0x2e/0x80 [ 1.688098] drm_dev_unplug+0x21/0x40 [ 1.688100] simpledrm_remove+0x11/0x20 [ 1.688103] platform_remove+0x1f/0x40 [ 1.688106] __device_release_driver+0x17a/0x240 [ 1.688109] device_release_driver+0x24/0x30 [ 1.688112] bus_remove_device+0xd8/0x140 [ 1.688115] device_del+0x18b/0x3f0 [ 1.688118] ? _raw_spin_unlock_irqrestore+0x1b/0x30 [ 1.688121] ? try_to_wake_up+0x94/0x5b0 [ 1.688124] platform_device_del.part.0+0x13/0x70 [ 1.688127] platform_device_unregister+0x1c/0x30 [ 1.688130] drm_aperture_detach_drivers+0xa1/0xd0 [ 1.688134] drm_aperture_remove_conflicting_pci_framebuffers+0x3f/0x60 [ 1.688137] radeon_pci_probe+0x54/0xf0 [radeon] [ 1.688212] local_pci_probe+0x45/0x80 [ 1.688216] ? pci_match_device+0xd7/0x130 [ 1.688219] pci_device_probe+0xc2/0x1d0 [ 1.688223] really_probe+0x1f5/0x3d0 [ 1.688226] __driver_probe_device+0xfe/0x180 [ 1.688229] driver_probe_device+0x1e/0x90 [ 1.688232] __driver_attach+0xc0/0x1c0 [ 1.688235] ? __device_attach_driver+0xe0/0xe0 [ 1.688237] ? __device_attach_driver+0xe0/0xe0 [ 1.688239] bus_for_each_dev+0x78/0xc0 [ 1.688242] bus_add_driver+0x149/0x1e0 [ 1.688245] driver_register+0x8f/0xe0 [ 1.688248] ? 0xffffffffc051d000 [ 1.688250] do_one_initcall+0x44/0x200 [ 1.688254] ? kmem_cache_alloc_trace+0x170/0x2c0 [ 1.688257] do_init_module+0x5c/0x260 [ 1.688262] __do_sys_finit_module+0xb4/0x120 [ 1.688266] __do_fast_syscall_32+0x6b/0xe0 [ 1.688270] do_fast_syscall_32+0x2f/0x70 [ 1.688272] entry_SYSCALL_compat_after_hwframe+0x45/0x4d [ 1.688275] RIP: 0023:0xf7e51549 [ 1.688278] Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 = 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 cd 0f 05 cd 80 <5d= > 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 [ 1.688281] RSP: 002b:00000000ffa1666c EFLAGS: 00200292 ORIG_RAX: 000000= 000000015e [ 1.688285] RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00000000f7e= 30e09 [ 1.688287] RDX: 0000000000000000 RSI: 00000000f9a705d0 RDI: 00000000f9a= 6f6a0 [ 1.688288] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000= 00000 [ 1.688290] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000= 00000 [ 1.688291] R13: 0000000000000000 R14: 0000000000000000 R15: 00000000000= 00000 [ 1.688294] [ 1.688355] Disabling lock debugging due to kernel taint=