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

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Date:   Wed, 4 Dec 2019 05:51:59 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
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)

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.

[   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