linux-kernel - Re: kernelci/staging-next bisection: sleep.login on rk3288-rock2-square #2286-staging

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Date:   Fri, 18 Dec 2020 21:59:26 +0000
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kernelci-results-staging@...ups.io,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...nel.org>, Baoquan He <bhe@...hat.com>
Subject: Re: kernelci/staging-next bisection: sleep.login on
 rk3288-rock2-square #2286-staging

On 13/12/2020 08:23, Mike Rapoport wrote:
> Hi Guillaume,
> 
> On Fri, Dec 11, 2020 at 09:53:46PM +0000, Guillaume Tucker wrote:
>> Hi Mike,
>>
>> Please see the bisection report below about a boot failure on
>> rk3288 with next-20201210.
>>
>> Reports aren't automatically sent to the public while we're
>> trialing new bisection features on kernelci.org but this one
>> looks valid.
>>
>> There's nothing in the serial console log, probably because it's
>> crashing too early during boot.  This was confirmed on two rk3288
>> platforms on kernelci.org: rk3288-veyron-jaq and
>> rk3288-rock2-square.  There's no clear sign about other platforms
>> being impacted.
>>
>> If this looks like something you want to investigate but you
>> don't have a platform at hand to reproduce it, please let us know
>> if you would like the test to be re-run on kernelci.org with some
>> debug config turned on, or if you have a fix to try.
> 
> I'd apprciate if you can build a working kernel with
> CONFIG_DEBUG_MEMORY_INIT=y and run it with 
> 
> 	memblock=debug mminit_loglevel=4
> 
> in the command line.
> 
> If I understand correctly, DEBUG_LL is not an option for these platforms
> so if earlyprintk didn't display the log there is not much to do about
> it.

OK, sorry for the delay.  I've built a kernel and booted it as
you requested, and also found that the issue was due to this
memory area defined in arch/arm/boot/dts/rk3288.dtsi:

        reserved-memory {
                #address-cells = <2>;
                #size-cells = <2>;
                ranges;

                /*
                 * The rk3288 cannot use the memory area above 0xfe000000
                 * for dma operations for some reason. While there is
                 * probably a better solution available somewhere, we
                 * haven't found it yet and while devices with 2GB of ram
                 * are not affected, this issue prevents 4GB from booting.
                 * So to make these devices at least bootable, block
                 * this area for the time being until the real solution
                 * is found.
                 */
                dma-unusable@...00000 {
                        reg = <0x0 0xfe000000 0x0 0x1000000>;
                };
        };

So I've put a hack[1] on top of 950c37691925 to skip adding a
node in memblock_enforce_memory_reserved_overlap() if the base
address is 0xfe000000, which got the kernel booting.  Here's the
console log:

  https://people.collabora.com/~gtucker/tmp/2966825.txt

and the full test job details, if this helps:

  https://lava.collabora.co.uk/scheduler/job/2966825


I haven't really looked much further than that, but I'll be
available on Monday to help run other tests if needed.

Thanks,
Guillaume

[1] https://people.collabora.com/~gtucker/tmp/2966825.patch