From: Catalin Marinas <catalin.marinas@arm.com>
To: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Robin Murphy <robin.murphy@arm.com>,
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>,
Sri Krishna chowdary <schowdary@nvidia.com>,
Qian Cai <cai@lca.pw>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: kmemleak panic
Date: Sat, 19 Jan 2019 13:28:33 +0000 [thread overview]
Message-ID: <20190119132832.GA29881@MBP.local> (raw)
In-Reply-To: <b7629ecf-757c-f8b5-df83-ba83d7036b2f@free.fr>
On Fri, Jan 18, 2019 at 04:36:59PM +0100, Marc Gonzalez wrote:
> mount -t debugfs nodev /sys/kernel/debug/
> echo scan > /sys/kernel/debug/kmemleak
>
> Unable to handle kernel paging request at virtual address ffffffc021e00000
[...]
> Call trace:
> scan_block+0x70/0x190
> scan_gray_list+0x108/0x1c0
> kmemleak_scan+0x33c/0x7c0
> kmemleak_write+0x410/0x4b0
As per Robin's remark, this address seems to be pretty easy to
reproduce. It also happens via scan_gray_list() which indicates an
object kmemleak was informed about via kmemleak_alloc() (so this
excludes the pfn that Qian noticed).
Can you configure the kernel with CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN off
just to avoid the bug being triggered early and run:
mount -t debugfs nodev /sys/kernel/debug/
echo dump=0xffffffc021e00000 > /sys/kernel/debug/kmemleak
Then run another scan to make sure this is the address that triggered
the page fault:
echo scan > /sys/kernel/debug/kmemleak
The above should tell us where the object that kmemleak is trying to
scan came from.
Of course, ideally we should bisect this but I haven't been able to
reproduce it.
--
Catalin
next prev parent reply other threads:[~2019-01-19 13:28 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 13:36 kmemleak panic Marc Gonzalez
2019-01-18 14:10 ` Marc Gonzalez
2019-01-18 14:34 ` Catalin Marinas
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 [this message]
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
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
[not found] ` <20190207163214.45C1B218D3@mail.kernel.org>
2019-02-08 10:02 ` Mike Rapoport
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 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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