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Tue, 2 Nov 2021 09:40:34 +0000 From: Alexey Makhalov To: Michal Hocko CC: David Hildenbrand , "linux-mm@kvack.org" , Andrew Morton , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , Oscar Salvador Subject: Re: [PATCH] mm: fix panic in __alloc_pages Thread-Topic: [PATCH] mm: fix panic in __alloc_pages Thread-Index: AQHXz1zvSxS/i+mFgUadpM+6bJvGtavv3QcAgAAG4YD//5TPAIAAec8AgAAKHIA= Date: Tue, 2 Nov 2021 09:40:34 +0000 Message-ID: References: <20211101201312.11589-1-amakhalov@vmware.com> <7136c959-63ff-b866-b8e4-f311e0454492@redhat.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3654.120.0.1.13) authentication-results: suse.com; dkim=none (message not signed) header.d=none;suse.com; dmarc=none action=none header.from=vmware.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bdbd759b-2109-4cb6-3418-08d99de4d1e0 x-ms-traffictypediagnostic: MWHPR0501MB3915: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset=utf-8 >=20 > It is hard to follow your reply as your email client is not quoting > properly. Let me try to reconstruct >=20 > On Tue 02-11-21 08:48:27, Alexey Makhalov wrote: >> On 02.11.21 08:47, Michal Hocko wrote: > [...] >>>>> CPU2 has been hot-added >>>>> BUG: unable to handle page fault for address: 0000000000001608 >>>>> #PF: supervisor read access in kernel mode >>>>> #PF: error_code(0x0000) - not-present page >>>>> PGD 0 P4D 0 >>>>> Oops: 0000 [#1] SMP PTI >>>>> CPU: 0 PID: 1 Comm: systemd Tainted: G E = 5.15.0-rc7+ #11 >>>>> Hardware name: VMware, Inc. VMware7,1/440BX Desktop Reference = Platform, BIOS VMW >>>>>=20 >>>>> RIP: 0010:__alloc_pages+0x127/0x290 >>>>=20 >>>> Could you resolve this into a specific line of the source code = please? >=20 > This got probably unnoticed. I would be really curious whether this is > a broken zonelist or something else. backtrace (including inline functions) pcpu_alloc_pages() alloc_pages_node() __alloc_pages_node() __alloc_pages() prepare_alloc_pages() node_zonelist() Panic happens in node_zonelist(), dereferencing NULL pointer of = NODE_DATA(nid) in include/linux/gfp.h:514 512 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 513 { 514 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 515 } >=20 >>>>> Node can be in one of the following states: >>>>> 1. not present (nid =3D=3D NUMA_NO_NODE) >>>>> 2. present, but offline (nid > NUMA_NO_NODE, node_online(nid) =3D=3D= 0, >>>>> NODE_DATA(nid) =3D=3D NULL) >>>>> 3. present and online (nid > NUMA_NO_NODE, node_online(nid) > 0, >>>>> NODE_DATA(nid) !=3D NULL) >>>>>=20 >>>>> alloc_page_{bulk_array}node() functions verify for nid validity = only >>>>> and do not check if nid is online. Enhanced verification check = allows >>>>> to handle page allocation when node is in 2nd state. >>>>=20 >>>> I do not think this is a correct approach. We should make sure that = the >>>> proper fallback node is used instead. This means that the zone list = is >>>> initialized properly. IIRC this has been a problem in the past and = it >>>> has been fixed. The initialization code is quite subtle though so = it is >>>> possible that this got broken again. >=20 >> This approach behaves in the same way as CPU was not yet added. = (state #1). >> So, we can think of state #2 as state #1 when CPU is not present. >=20 >>> I'm a little confused: >>>=20 >>> In add_memory_resource() we hotplug the new node if required and set = it >>> online. Memory might get onlined later, via online_pages(). >>=20 >> You are correct. In case of memory hot add, it is true. But in case = of adding >> CPU with memoryless node, try_node_online() will be called only = during CPU >> onlining, see cpu_up(). >>=20 >> Is there any reason why try_online_node() resides in cpu_up() and not = in add_cpu()? >> I think it would be correct to online node during the CPU hot add to = align with >> memory hot add. >=20 > I am not familiar with cpu hotplug, but this doesn't seem to be = anything > new so how come this became problem only now? This is not CPU only hotplug, but CPU + NUMA node, and this new node is = with no memory. We accidentally found it by not unlining the CPU immediately. >=20 >>> So after add_memory_resource()->__try_online_node() succeeded, we = have >>> an online pgdat -- essentially 3. >>>=20 >> This patch detects if we're past 3. but says that it reproduced by >> disabling *memory* onlining. >> This is the hot adding of both new CPU and new _memoryless_ node = (with CPU only) >> And onlining CPU makes its node online. Disabling CPU onlining puts = new node >> into state #2, which leads to repro. >>=20 >>> Before we online memory for a hotplugged node, all zones are = !populated. >>> So once we online memory for a !populated zone in online_pages(), we >>> trigger setup_zone_pageset(). >>>=20 >>>=20 >>> The confusing part is that this patch checks for 3. but says it can = be >>> reproduced by not onlining *memory*. There seems to be something = missing. >>=20 >> Do we maybe need a proper populated_zone() check before accessing = zone data? >=20 > No, we need them initialize properly. >=20 Thanks, =E2=80=94Alexey --Apple-Mail=_A058B4B4-19B4-44AE-8BE9-284BD44DC727 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEQe6bu7hIFElmsM7CGW4w8WwwaSUFAmGBB5EACgkQGW4w8Www aSVECQ//YC51z6/1ImbayvSdje7aLwF7ODxa7r6/PZxIl/0Y+JGEo+NIlQzQhjhK SQhH3MmLwCM/kwSFQfiPMQ1pUew5wlHtFYWr5bDI7hnhTgHTXaJTfJR3czo87Wca JG5bogFbn0uRYSO2eDdJSSnho+PB/3D4RTU/W/XTG1ZR7dnVZtvL/fv/H5ePLdpL eDoistgby9FxxEc/6g8ZFPMfm60G91OL3Kx3tE5nY+z7scYdJ6sqwthBA6ocGr+M 4S4tmXQnwbhUo9TMGIYTmqvKaNB75rIstIMcTBffvRhCW1TRJi6UFwWsxIOON9PF 4nNTo9RX6VAGocH13PrhwlrNEW3CPcOkucwYTMdM6aLM9s/r2lkF7nynkJ87/UXM iI4VZC9nx65IBAxUtkWm2Q9fKM6c6Ajsr4qNL7kkFBlWWQ7x3e85ShSZjkCELiXv lJ/57brqd5wFVR2Wc45jAqbQWDCy+YjUNDMIGSptjMU7JEuziQvP3m0ar7xW3oMb 9LglYg786YuMxsmDz+SYDWoiJvFvqAqmZDP0WNmgliBpb3FVNqlAPtk6Xa0T0xMZ IiGGq73G68VWaLQc+OaHIhkae66TVADX2GwD525E6w6np5uJZb2jsxO1PDDT2vq3 YR7wRnuJjhKwXcIV7w/IifI3SbW2MUTwxgxir1KEDVyyFjVH0Jk= =Vrkn -----END PGP SIGNATURE----- --Apple-Mail=_A058B4B4-19B4-44AE-8BE9-284BD44DC727--