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From: Michal Hocko <mhocko@suse.com>
To: Alexey Makhalov <amakhalov@vmware.com>
Cc: Dennis Zhou <dennis@kernel.org>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@redhat.com>,
	Oscar Salvador <osalvador@suse.de>, Tejun Heo <tj@kernel.org>,
	Christoph Lameter <cl@linux.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH v3] mm: fix panic in __alloc_pages
Date: Thu, 9 Dec 2021 10:56:42 +0100	[thread overview]
Message-ID: <YbHS2qN4wY+1hWZp@dhcp22.suse.cz> (raw)
In-Reply-To: <2291C572-3B22-4BE5-8C7A-0D6A4609547B@vmware.com>

On Thu 09-12-21 09:28:55, Alexey Makhalov wrote:
> 
> 
> > On Dec 9, 2021, at 12:46 AM, Michal Hocko <mhocko@suse.com> wrote:
> > 
> > On Thu 09-12-21 02:16:17, Alexey Makhalov wrote:
> >> This patch calls alloc_percpu() from setup_arch() while percpu
> >> allocator is not yet initialized (before setup_per_cpu_areas()).
> > 
> > Yeah, I haven't realized the pcp is not available. I was not really sure
> > about that. Could you try with the alloc_percpu dropped?
> > 
> > Thanks for testing!
> > -- 
> > Michal Hocko
> > SUSE Labs
> 
> It boots now. dmesg has these new messages:
> 
> [    0.081777] Node 4 uninitialized by the platform. Please report with boot dmesg.
> [    0.081790] Initmem setup node 4 [mem 0x0000000000000000-0x0000000000000000]
> ...
> [    0.086441] Node 127 uninitialized by the platform. Please report with boot dmesg.
> [    0.086454] Initmem setup node 127 [mem 0x0000000000000000-0x0000000000000000]

Interesting that only those two didn't get a proper arch specific
initialization. Could you check why? I assume init_cpu_to_node
doesn't see any CPU pointing at this node. Wondering why that would be
the case but that can be a bug in the affinity tables.

> vCPU/node hot add works.
> Onlining works as well, but with warning. I do not think it is related to the patch:
> [   36.838838] CPU4 has been hot-added
> [   36.838987] acpi_processor_hotadd_init:205 cpu 4, node 4, online 0, ndata 00000000e9c7f79b
> [   48.480498] Built 4 zonelists, mobility grouping on.  Total pages: 961440
> [   48.480508] Policy zone: Normal
> [   48.508318] smpboot: Booting Node 4 Processor 4 APIC 0x8
> [   48.509255] Disabled fast string operations
> [   48.509807] smpboot: CPU 4 Converting physical 8 to logical package 4
> [   48.509825] smpboot: CPU 4 Converting physical 0 to logical die 4
> [   48.510040] WARNING: workqueue cpumask: online intersect > possible intersect

I will double check. There are changes required on the hotplug side. I
would like to see that this one doesn't blow up before diving there.

> [   48.510324] vmware: vmware-stealtime: cpu 4, pa 3e667000
> [   48.511311] Will online and init hotplugged CPU: 4
> 
> Hot remove does not quite work. It might be issue in ACPI/Firmware code or Hypervisor. Debugging…
> 
> Do you want me to perform any specific tests?

No, not really. AFAIU your issue has been reproducible during boot and
that seems to be fixed. I will work on the hotplug side of the things
and post something resembling a real patch soon. That would require also
memory hotplug testing.

Thanks for your help!
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2021-12-09  9:56 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-01 20:13 [PATCH] mm: fix panic in __alloc_pages Alexey Makhalov
2021-11-01 20:38 ` Matthew Wilcox
2021-11-02  7:47 ` Michal Hocko
2021-11-02  8:12   ` David Hildenbrand
2021-11-02  8:48     ` Alexey Makhalov
2021-11-02  9:04       ` Michal Hocko
2021-11-02  9:24         ` David Hildenbrand
2021-11-02 10:34           ` Alexey Makhalov
2021-11-02 11:00             ` David Hildenbrand
2021-11-02 11:44               ` Michal Hocko
2021-11-02 12:06                 ` David Hildenbrand
2021-11-02 12:27                   ` Michal Hocko
2021-11-02 12:39                     ` David Hildenbrand
2021-11-02 13:25                       ` Michal Hocko
2021-11-02 13:41                         ` David Hildenbrand
2021-11-02 14:12                           ` Michal Hocko
2021-11-02 14:44                             ` David Hildenbrand
2021-11-02 13:52                         ` Oscar Salvador
2021-11-02 14:35                           ` Michal Hocko
2021-11-08  6:12                   ` Alexey Makhalov
2021-11-08  6:36                     ` [PATCH v2] " Alexey Makhalov
2021-11-08  8:32                       ` David Hildenbrand
2021-11-08 20:23                         ` [PATCH v3] " Alexey Makhalov
2021-11-09  2:08                           ` Eric Dumazet
2021-11-09  7:03                             ` David Hildenbrand
2021-11-09 16:55                               ` Eric Dumazet
2021-11-09 17:15                             ` Michal Hocko
2021-11-09 19:06                               ` Dennis Zhou
2021-11-09 19:54                                 ` Michal Hocko
2021-11-16  1:31                                   ` Alexey Makhalov
2021-11-16  9:17                                     ` Michal Hocko
2021-11-16 20:22                                       ` Alexey Makhalov
2021-11-18  8:35                                         ` Michal Hocko
2021-12-07 10:54                                           ` Michal Hocko
2021-12-07 11:08                                             ` David Hildenbrand
2021-12-07 12:13                                               ` Michal Hocko
2021-12-07 12:28                                                 ` David Hildenbrand
2021-12-07 13:23                                                   ` Michal Hocko
2021-12-07 15:09                                                     ` David Hildenbrand
2021-12-07 15:29                                                       ` Michal Hocko
2021-12-07 15:34                                                         ` David Hildenbrand
2021-12-07 15:56                                                           ` Michal Hocko
2021-12-07 16:09                                                             ` David Hildenbrand
2021-12-07 16:27                                                               ` Michal Hocko
2021-12-07 16:36                                                                 ` Michal Hocko
2021-12-07 16:40                                                                   ` David Hildenbrand
2021-12-08  8:28                                                                     ` Michal Hocko
2021-12-07 17:02                                                                   ` Alexey Makhalov
2021-12-07 17:13                                                                     ` David Hildenbrand
2021-12-07 17:17                                                                       ` Alexey Makhalov
2021-12-07 18:03                                                                         ` David Hildenbrand
2021-12-08  8:12                                                                           ` Michal Hocko
2021-12-08  8:24                                                                             ` David Hildenbrand
2021-12-08  8:34                                                                               ` Michal Hocko
2021-12-08  8:38                                                                                 ` David Hildenbrand
2021-12-08  8:04                                                                         ` Michal Hocko
2021-12-08  8:19                                                                           ` Alexey Makhalov
2021-12-08  8:30                                                                             ` Michal Hocko
2021-12-08  8:54                                             ` Michal Hocko
2021-12-08  8:57                                               ` Alexey Makhalov
2021-12-08  9:55                                                 ` Michal Hocko
2021-12-09  2:16                                               ` Alexey Makhalov
2021-12-09  8:46                                                 ` Michal Hocko
2021-12-09  9:28                                                   ` Alexey Makhalov
2021-12-09  9:56                                                     ` Michal Hocko [this message]
2021-12-09 10:23                                                       ` Alexey Makhalov
2021-12-09 13:29                                                         ` Michal Hocko
2021-12-09 19:01                                                           ` Alexey Makhalov
2021-12-10  9:11                                                             ` Michal Hocko
2021-12-17 12:53                                                               ` Michal Hocko
2021-12-21  5:46                                                                 ` Alexey Makhalov
2021-12-21  9:46                                                                   ` Michal Hocko
2021-12-21 20:23                                                                     ` Alexey Makhalov
2021-12-22 11:41                                                                       ` Michal Hocko
2021-12-09 10:48                                             ` Michal Hocko
2021-12-13 15:06                                               ` Michal Hocko
2021-12-13 15:07                                                 ` David Hildenbrand
2021-12-14  8:38                                                   ` Michal Hocko
2021-12-14 10:07                                               ` [PATCH v2 0/4] mm, memory_hotplug: handle unitialized numa node gracefully Michal Hocko
2021-12-14 10:07                                                 ` [PATCH v2 1/4] mm, memory_hotplug: make arch_alloc_nodedata independent on CONFIG_MEMORY_HOTPLUG Michal Hocko
2021-12-14 10:07                                                 ` [PATCH v2 2/4] mm: handle uninitialized numa nodes gracefully Michal Hocko
2021-12-14 10:33                                                   ` Christoph Lameter
2021-12-14 10:38                                                     ` Michal Hocko
2022-01-14  0:24                                                       ` Wei Yang
2022-01-14 10:01                                                         ` Michal Hocko
2021-12-15  4:47                                                   ` kernel test robot
2021-12-15  4:47                                                     ` kernel test robot
2021-12-15 10:12                                                     ` Michal Hocko
2021-12-15 10:12                                                       ` Michal Hocko
2021-12-14 10:07                                                 ` [PATCH v2 3/4] mm, memory_hotplug: drop arch_free_nodedata Michal Hocko
2021-12-14 10:07                                                 ` [PATCH v2 4/4] mm, memory_hotplug: reorganize new pgdat initialization Michal Hocko
2021-12-17 14:51                                                 ` [PATCH v2 0/4] mm, memory_hotplug: handle unitialized numa node gracefully David Hildenbrand
2021-12-21  9:51                                                   ` Michal Hocko
2022-01-02  7:14                                                     ` Mike Rapoport
2022-01-10 17:16                                                       ` Michal Hocko
2022-01-10 21:16                                                 ` Rafael Aquini
2022-01-11  8:34                                                   ` Michal Hocko
2021-11-08 10:37                       ` [PATCH v2] mm: fix panic in __alloc_pages Michal Hocko
2021-11-02  9:40         ` [PATCH] " Alexey Makhalov
2021-11-02  9:40         ` Michal Hocko

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