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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org,
	David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH 1/2] mm/memunmap: Use the correct start and end pfn when removing pages from zone
Date: Fri, 27 Sep 2019 07:21:44 +0530
Message-ID: <894daaaf-ce64-c2d8-d246-5d4c5f42579d@linux.ibm.com> (raw)
In-Reply-To: <20190926154508.3dba3dc398b7bb9a40ba15da@linux-foundation.org>

On 9/27/19 4:15 AM, Andrew Morton wrote:
> On Thu, 26 Sep 2019 17:55:51 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> 
>> With altmap, all the resource pfns are not initialized. While initializing
>> pfn, altmap reserve space is skipped. Hence when removing pfn from zone skip
>> pfns that were never initialized.
>>
>> Update memunmap_pages to calculate start and end pfn based on altmap
>> values. This fixes a kernel crash that is observed when destroying namespace.
>>
>> [   74.745056] BUG: Unable to handle kernel data access at 0xc00c000001400000
>> [   74.745256] Faulting instruction address: 0xc0000000000b58b0
>> cpu 0x2: Vector: 300 (Data Access) at [c00000026ea93580]
>>      pc: c0000000000b58b0: memset+0x68/0x104
>>      lr: c0000000003eb008: page_init_poison+0x38/0x50
>>      ...
>>    current = 0xc000000271c67d80
>>    paca    = 0xc00000003fffd680   irqmask: 0x03   irq_happened: 0x01
>>      pid   = 3665, comm = ndctl
>> [link register   ] c0000000003eb008 page_init_poison+0x38/0x50
>> [c00000026ea93830] c0000000004754d4 remove_pfn_range_from_zone+0x64/0x3e0
>> [c00000026ea938a0] c0000000004b8a60 memunmap_pages+0x300/0x400
>> [c00000026ea93930] c0000000009e32a0 devm_action_release+0x30/0x50
> 
> Doesn't apply to mainline or -next.  Which tree is this against?
> 

After applying the patches from David on mainline. That is the reason I 
replied to this thread. I should have mentioned in the email that it is 
based on patch series "[PATCH v4 0/8] mm/memory_hotplug: Shrink zones 
before removing memory"

-aneesh
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Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190830091428.18399-1-david@redhat.com>
2019-09-26 12:25 ` Aneesh Kumar K.V
2019-09-26 12:25   ` [PATCH 2/2] mm/memmap_init: Update variable name in memmap_init_zone Aneesh Kumar K.V
2019-09-26 12:56     ` David Hildenbrand
2019-09-26 13:38     ` Pankaj Gupta
2019-09-26 12:43   ` [PATCH 1/2] mm/memunmap: Use the correct start and end pfn when removing pages from zone David Hildenbrand
2019-09-26 13:15     ` Aneesh Kumar K.V
2019-09-26 13:34   ` Pankaj Gupta
2019-09-26 22:45   ` Andrew Morton
2019-09-27  1:51     ` Aneesh Kumar K.V [this message]
2019-09-27  7:46       ` David Hildenbrand
2019-09-27 10:32         ` [PATCH] " Aneesh Kumar K.V
2019-09-27 10:38           ` David Hildenbrand
2019-09-27 10:36         ` [PATCH 1/2] " Aneesh Kumar K.V
2019-09-27 10:40           ` David Hildenbrand
2019-09-27 11:35             ` Aneesh Kumar K.V
2019-09-27 11:38               ` David Hildenbrand

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