Re: [PATCH V15 14/18] block: enable multipage bvecs

[Marek Szyprowski]

Hi Ming,

On 2019-02-21 11:38, Ming Lei wrote:
> On Thu, Feb 21, 2019 at 11:22:39AM +0100, Marek Szyprowski wrote:
>> On 2019-02-21 11:16, Ming Lei wrote:
>>> On Thu, Feb 21, 2019 at 11:08:19AM +0100, Marek Szyprowski wrote:
>>>> On 2019-02-21 10:57, Ming Lei wrote:
>>>>> On Thu, Feb 21, 2019 at 09:42:59AM +0100, Marek Szyprowski wrote:
>>>>>> On 2019-02-15 12:13, Ming Lei wrote:
>>>>>>> This patch pulls the trigger for multi-page bvecs.
>>>>>>>
>>>>>>> Reviewed-by: Omar Sandoval <osandov@xxxxxx>
>>>>>>> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
>>>>>> Since Linux next-20190218 I've observed problems with block layer on one
>>>>>> of my test devices (Odroid U3 with EXT4 rootfs on SD card). Bisecting
>>>>>> this issue led me to this change. This is also the first linux-next
>>>>>> release with this change merged. The issue is fully reproducible and can
>>>>>> be observed in the following kernel log:
>>>>>>
>>>>>> sdhci: Secure Digital Host Controller Interface driver
>>>>>> sdhci: Copyright(c) Pierre Ossman
>>>>>> s3c-sdhci 12530000.sdhci: clock source 2: mmc_busclk.2 (100000000 Hz)
>>>>>> s3c-sdhci 12530000.sdhci: Got CD GPIO
>>>>>> mmc0: SDHCI controller on samsung-hsmmc [12530000.sdhci] using ADMA
>>>>>> mmc0: new high speed SDHC card at address aaaa
>>>>>> mmcblk0: mmc0:aaaa SL16G 14.8 GiB
>>>>>>
>>>>>> ...
>>>>>>
>>>>>> EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
>>>>>> EXT4-fs (mmcblk0p2): write access will be enabled during recovery
>>>>>> EXT4-fs (mmcblk0p2): recovery complete
>>>>>> EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
>>>>>> VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
>>>>>> devtmpfs: mounted
>>>>>> Freeing unused kernel memory: 1024K
>>>>>> hub 1-3:1.0: USB hub found
>>>>>> Run /sbin/init as init process
>>>>>> hub 1-3:1.0: 3 ports detected
>>>>>> *** stack smashing detected ***: <unknown> terminated
>>>>>> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
>>>>>> CPU: 1 PID: 1 Comm: init Not tainted 5.0.0-rc6-next-20190218 #1546
>>>>>> Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
>>>>>> [<c01118d0>] (unwind_backtrace) from [<c010d794>] (show_stack+0x10/0x14)
>>>>>> [<c010d794>] (show_stack) from [<c09ff8a4>] (dump_stack+0x90/0xc8)
>>>>>> [<c09ff8a4>] (dump_stack) from [<c0125944>] (panic+0xfc/0x304)
>>>>>> [<c0125944>] (panic) from [<c012bc98>] (do_exit+0xabc/0xc6c)
>>>>>> [<c012bc98>] (do_exit) from [<c012c100>] (do_group_exit+0x3c/0xbc)
>>>>>> [<c012c100>] (do_group_exit) from [<c0138908>] (get_signal+0x130/0xbf4)
>>>>>> [<c0138908>] (get_signal) from [<c010c7a0>] (do_work_pending+0x130/0x618)
>>>>>> [<c010c7a0>] (do_work_pending) from [<c0101034>]
>>>>>> (slow_work_pending+0xc/0x20)
>>>>>> Exception stack(0xe88c3fb0 to 0xe88c3ff8)
>>>>>> 3fa0:ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ 00000000 bea7787c 00000005
>>>>>> b6e8d0b8
>>>>>> 3fc0: bea77a18 b6f92010 b6e8d0b8 00000001 b6e8d0c8 00000001 b6e8c000
>>>>>> bea77b60
>>>>>> 3fe0: 00000020 bea77998 ffffffff b6d52368 60000050 ffffffff
>>>>>> CPU3: stopping
>>>>>>
>>>>>> I would like to help debugging and fixing this issue, but I don't really
>>>>>> have idea where to start. Here are some more detailed information about
>>>>>> my test system:
>>>>>>
>>>>>> 1. Board: ARM 32bit Samsung Exynos4412-based Odroid U3 (device tree
>>>>>> source: arch/arm/boot/dts/exynos4412-odroidu3.dts)
>>>>>>
>>>>>> 2. Block device: MMC/SDHCI/SDHCI-S3C with SD card
>>>>>> (drivers/mmc/host/sdhci-s3c.c driver, sdhci_2 device node in the device
>>>>>> tree)
>>>>>>
>>>>>> 3. Rootfs: Ext4
>>>>>>
>>>>>> 4. Kernel config: arch/arm/configs/exynos_defconfig
>>>>>>
>>>>>> I can gather more logs if needed, just let me which kernel option to
>>>>>> enable. Reverting this commit on top of next-20190218 as well as current
>>>>>> linux-next (tested with next-20190221) fixes this issue and makes the
>>>>>> system bootable again.
>>>>> Could you test the patch in following link and see if it can make a difference?
>>>>>
>>>>> https://marc.info/?l=linux-aio&m=155070355614541&w=2
>>>> I've tested that patch, but it doesn't make any difference on the test
>>>> system. In the log I see no warning added by it.
>>> I guess it might be related with memory corruption, could you enable the
>>> following debug options and post the dmesg log?
>>>
>>> CONFIG_DEBUG_STACKOVERFLOW=y
>>> CONFIG_KASAN=y
>> It won't be that easy as none of the above options is available on ARM
>> 32bit. I will try to apply some ARM KASAN patches floating on the net
>> and let you know the result.
> Hi Marek,
>
> Could you test the following patch?

Yes. Sadly, no change observed.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland