From: Marek Szyprowski <m.szyprowski@samsung.com>
To: Mike Rapoport <rppt@linux.ibm.com>,
Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Rob Herring <robh+dt@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Prateek Patel <prpatel@nvidia.com>,
Sachin Nikam <snikam@nvidia.com>,
John Hubbard <jhubbard@nvidia.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Robin Murphy <robin.murphy@arm.com>,
Frank Rowand <frowand.list@gmail.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>
Subject: Re: kmemleak panic
Date: Wed, 23 Jan 2019 08:28:03 +0100 [thread overview]
Message-ID: <78f4ea8a-996d-038e-9e33-5ff02fa2c43f@samsung.com> (raw)
In-Reply-To: <20190123055414.GA4747@rapoport-lnx>
Hi Mike,
On 2019-01-23 06:54, Mike Rapoport wrote:
...
> Resending it as a formal patch now, I took a liberty to add your Tested-by.
>
> >From a847ca684db29a3c09e4dd2a8a008b35cf36e52f Mon Sep 17 00:00:00 2001
> From: Mike Rapoport <rppt@linux.ibm.com>
> Date: Wed, 23 Jan 2019 07:38:50 +0200
> Subject: [PATCH] of: fix kmemleak crash caused by imbalance in early memory
> reservation
>
> Marc Gonzalez reported the following kmemleak crash:
>
> Unable to handle kernel paging request at virtual address ffffffc021e00000
> Mem abort info:
> ESR = 0x96000006
> Exception class = DABT (current EL), IL = 32 bits
> SET = 0, FnV = 0
> EA = 0, S1PTW = 0
> Data abort info:
> ISV = 0, ISS = 0x00000006
> CM = 0, WnR = 0
> swapper pgtable: 4k pages, 39-bit VAs, pgdp = (____ptrval____)
> [ffffffc021e00000] pgd=000000017e3ba803, pud=000000017e3ba803,
> pmd=0000000000000000
> Internal error: Oops: 96000006 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 6 PID: 523 Comm: kmemleak Tainted: G S W 5.0.0-rc1 #13
> Hardware name: Qualcomm Technologies, Inc. MSM8998 v1 MTP (DT)
> pstate: 80000085 (Nzcv daIf -PAN -UAO)
> pc : scan_block+0x70/0x190
> lr : scan_block+0x6c/0x190
> sp : ffffff8012e8bd20
> x29: ffffff8012e8bd20 x28: ffffffc0fdbaf018
> x27: ffffffc022000000 x26: 0000000000000080
> x25: ffffff8011aadf70 x24: ffffffc0f8cc8000
> x23: ffffff8010dc8000 x22: ffffff8010dc8830
> x21: ffffffc021e00ff9 x20: ffffffc0f8cc8050
> x19: ffffffc021e00000 x18: 0000000000002409
> x17: 0000000000000200 x16: 0000000000000000
> x15: ffffff8010e14dd8 x14: 0000000000002406
> x13: 000000004c4dd0c6 x12: ffffffc0f77dad58
> x11: 0000000000000001 x10: ffffff8010d9e688
> x9 : ffffff8010d9f000 x8 : ffffff8010d9e688
> x7 : 0000000000000002 x6 : 0000000000000000
> x5 : ffffff8011511c20 x4 : 00000000000026d1
> x3 : ffffff8010e14d88 x2 : 5b36396f4e7d4000
> x1 : 0000000000208040 x0 : 0000000000000000
> Process kmemleak (pid: 523, stack limit = 0x(____ptrval____))
> Call trace:
> scan_block+0x70/0x190
> scan_gray_list+0x108/0x1c0
> kmemleak_scan+0x33c/0x7c0
> kmemleak_scan_thread+0x98/0xf0
> kthread+0x11c/0x120
> ret_from_fork+0x10/0x1c
> Code: f9000fb4 d503201f 97ffffd2 35000580 (f9400260)
> ---[ end trace 176d6ed9d86a0c33 ]---
> note: kmemleak[523] exited with preempt_count 2
>
> The crash happens when a no-map area is allocated in
> early_init_dt_alloc_reserved_memory_arch(). The allocated region is
> registered with kmemleak, but it is then removed from memblock using
> memblock_remove() that is not kmemleak-aware.
>
> Replacing __memblock_alloc_base() with memblock_find_in_range() makes sure
> that the allocated memory is not added to kmemleak and then
> memblock_remove()'ing this memory is safe.
>
> As a bonus, since memblock_find_in_range() ensures the allocation in the
> specified range, the bounds check can be removed.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> Tested-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
With the minor fix mentioned below, you can add my:
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> drivers/of/of_reserved_mem.c | 13 ++++---------
> 1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 1977ee0adcb1..6807a1cffe55 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -37,21 +37,16 @@ int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> */
> end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
> align = !align ? SMP_CACHE_BYTES : align;
> - base = __memblock_alloc_base(size, align, end);
> + base = memblock_find_in_range(size, align, start, end);
Please remove a comment about __memblock_alloc_base() above that block
of code. It is no longer needed after this change.
> if (!base)
> return -ENOMEM;
>
> - /*
> - * Check if the allocated region fits in to start..end window
> - */
> - if (base < start) {
> - memblock_free(base, size);
> - return -ENOMEM;
> - }
> -
> *res_base = base;
> if (nomap)
> return memblock_remove(base, size);
> + else
> + return memblock_reserve(base, size);
> +
> return 0;
> }
>
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
next prev parent reply other threads:[~2019-01-23 7:28 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 ` kmemleak panic 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=78f4ea8a-996d-038e-9e33-5ff02fa2c43f@samsung.com \
--to=m.szyprowski@samsung.com \
--cc=akpm@linux-foundation.org \
--cc=ard.biesheuvel@linaro.org \
--cc=arnd@arndb.de \
--cc=bjorn.andersson@linaro.org \
--cc=cai@lca.pw \
--cc=catalin.marinas@arm.com \
--cc=frowand.list@gmail.com \
--cc=jhubbard@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=marc.w.gonzalez@free.fr \
--cc=mark.rutland@arm.com \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=prpatel@nvidia.com \
--cc=rcampbell@nvidia.com \
--cc=richard.weiyang@gmail.com \
--cc=robh+dt@kernel.org \
--cc=robin.murphy@arm.com \
--cc=rppt@linux.ibm.com \
--cc=snikam@nvidia.com \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).