From: Prateek Patel <prpatel@nvidia.com>
To: Marc Gonzalez <marc.w.gonzalez@free.fr>,
Rob Herring <robh+dt@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Sachin Nikam <snikam@nvidia.com>,
John Hubbard <jhubbard@nvidia.com>,
Ralph Campbell <rcampbell@nvidia.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Frank Rowand <frowand.list@gmail.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Oscar Salvador <osalvador@suse.de>,
Wei Yang <richard.weiyang@gmail.com>,
Michal Hocko <mhocko@suse.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Qian Cai <cai@lca.pw>, LKML <linux-kernel@vger.kernel.org>,
Vinayak Menon <vinmenon@codeaurora.org>
Subject: Re: kmemleak panic
Date: Tue, 22 Jan 2019 13:50:19 +0530 [thread overview]
Message-ID: <b23cec3f-8c18-7e08-39fb-73145526649e@nvidia.com> (raw)
In-Reply-To: <96070098-7f05-7eb8-2c5c-9c9da1a45e4a@free.fr>
On 1/21/2019 7:24 PM, Marc Gonzalez wrote:
> On 21/01/2019 14:35, Rob Herring wrote:
>
>> On Mon, Jan 21, 2019 at 6:19 AM Robin Murphy wrote:
>>> On 21/01/2019 11:57, Marc Gonzalez wrote:
>>> [...]
>>>> # echo dump=0xffffffc021e00000 > /sys/kernel/debug/kmemleak
>>>> kmemleak: Object 0xffffffc021e00000 (size 2097152):
>>>> kmemleak: comm "swapper/0", pid 0, jiffies 4294892296
>>>> kmemleak: min_count = 0
>>>> kmemleak: count = 0
>>>> kmemleak: flags = 0x1
>>>> kmemleak: checksum = 0
>>>> kmemleak: backtrace:
>>>> kmemleak_alloc_phys+0x48/0x60
>>>> memblock_alloc_range_nid+0x8c/0xa4
>>>> memblock_alloc_base_nid+0x4c/0x60
>>>> __memblock_alloc_base+0x3c/0x4c
>>>> early_init_dt_alloc_reserved_memory_arch+0x54/0xa4
>>>> fdt_init_reserved_mem+0x308/0x3ec
>>>> early_init_fdt_scan_reserved_mem+0x88/0xb0
>>>> arm64_memblock_init+0x1dc/0x254
>>>> setup_arch+0x1c8/0x4ec
>>>> start_kernel+0x84/0x44c
>>>> 0xffffffffffffffff
>>> OK, so via the __va(phys) call in kmemleak_alloc_phys(), you end up with
>>> the linear map address of a no-map reservation, which unsurprisingly
>>> turns out not to be mapped. Is there a way to tell kmemleak that it
>>> can't scan within a particular object?
Yes, kmemleak_no_scan() do this which is done in patch
https://patchwork.ozlabs.org/patch/995367/
This was done to avoid kmemleak scanning on the blocks which are nomaped
and should not have linear mapping created in kernel page table.
>> There was this patch posted[1]. I never got a reply, so it hasn't been applied.
>>
>> Rob
>>
>> https://patchwork.ozlabs.org/patch/995367/
> It is worth noting that the author's email address appears to be dead.
> <schowdary@nvidia.com>: host hqemgate08.nvidia.com[216.228.121.117] said:
> 550 #5.1.0 Address rejected. (in reply to RCPT TO command)
>
> Adding a few nvidia devs for comment.
next prev parent reply other threads:[~2019-01-22 8:20 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <f6fbf528-8213-e3b8-6990-9fcf9dec04d6@free.fr>
[not found] ` <20190118143434.GE118707@arrakis.emea.arm.com>
2019-01-18 15:36 ` Marc Gonzalez
2019-01-18 16:14 ` Qian Cai
2019-01-18 17:05 ` Marc Gonzalez
2019-01-18 17:38 ` Qian Cai
2019-01-19 10:21 ` Marc Gonzalez
2019-01-18 19:12 ` Robin Murphy
2019-01-19 13:28 ` Catalin Marinas
2019-01-21 11:57 ` Marc Gonzalez
2019-01-21 12:19 ` Robin Murphy
2019-01-21 13:35 ` Rob Herring
2019-01-21 13:54 ` Marc Gonzalez
2019-01-22 8:20 ` Prateek Patel [this message]
2019-01-21 14:37 ` Catalin Marinas
2019-01-21 15:42 ` Rob Herring
2019-01-21 15:53 ` Robin Murphy
2019-01-21 17:42 ` Mike Rapoport
2019-01-22 14:02 ` Marc Gonzalez
2019-01-22 14:12 ` Marc Gonzalez
2019-01-23 5:54 ` Mike Rapoport
2019-01-23 7:05 ` Prateek Patel
2019-01-23 7:28 ` Marek Szyprowski
2019-01-23 12:31 ` [PATCH v2] of: fix kmemleak crash (was: Re: kmemleak panic) Mike Rapoport
2019-02-01 16:23 ` [PATCH v2] of: fix kmemleak crash Marc Gonzalez
2019-02-04 10:10 ` Marc Gonzalez
2019-02-04 15:25 ` Greg Kroah-Hartman
2019-02-04 16:41 ` Rob Herring
2019-02-04 14:37 ` [RESEND PATCH v2] of: fix kmemleak crash caused by imbalance in early memory reservation Marc Gonzalez
2019-02-11 16:47 ` Marc Gonzalez
2019-02-12 16:03 ` Rob Herring
2019-02-12 21:50 ` Stephen Rothwell
2019-02-12 21:52 ` Andrew Morton
2019-02-12 22:12 ` Rob Herring
2019-02-13 6:57 ` Mike Rapoport
2019-02-13 9:27 ` Marc Gonzalez
2019-02-13 16:30 ` Mike Rapoport
2019-03-06 2:12 ` Guenter Roeck
2019-03-06 13:39 ` Rob Herring
2019-03-06 16:18 ` Guenter Roeck
2019-01-21 12:22 ` kmemleak panic Marc Gonzalez
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