linux-kernel - Re: [PATCH v7 16/25] arm: Add support for generic vDSO (causing crash)

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Date:   Wed, 4 Dec 2019 13:58:25 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Huw Davies <huw@...eweavers.com>,
        Shijith Thotton <sthotton@...vell.com>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v7 16/25] arm: Add support for generic vDSO (causing
 crash)

Hi Guenter,

On 12/4/19 1:51 PM, Guenter Roeck wrote:
> On Fri, Jun 21, 2019 at 10:52:43AM +0100, Vincenzo Frascino wrote:
>> The arm vDSO library requires some adaptations to use to take advantage
>> of the newly introduced generic vDSO library.
>>
>> Introduce the following changes:
>>  - Modification vdso.c to be compliant with the common vdso datapage
>>  - Use of lib/vdso for gettimeofday
>>  - Implementation of elf note
>>
>> Cc: Russell King <linux@...linux.org.uk>
>> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> 
> This patch causes a crash with qemu's mcimx6ul-evk emulation while running
> imx_v6_v7_defconfig.
> 

Thank you for reporting this. Could you please provide some details on how I can
reproduce the scenario you are describing?

> [   19.976852] Run /sbin/init as init process
> [   20.044931] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
> 
> There is nothing else useful in the log, unfortunately.
> 
> Reverting the following three patches fixes the problem.
> 
> 74d06efb9c2f ARM: 8932/1: Add clock_gettime64 entry point
> 052e76a31b4a ARM: 8931/1: Add clock_getres entry point
> 20e2fc42312f ARM: 8930/1: Add support for generic vDSO
> 
> Guenter
> 

-- 
Regards,
Vincenzo