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

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Date:   Wed, 4 Dec 2019 08:16:41 -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 Wed, Dec 04, 2019 at 01:58:25PM +0000, Vincenzo Frascino wrote:
> 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?
> 
- Build imx_v6_v7_defconfig
- Get root file system or initrd, for example from
  https://github.com/groeck/linux-build-test/tree/master/rootfs/arm
- Run image. Example, with initrd:
	qemu-system-arm -M mcimx6ul-evk -kernel arch/arm/boot/zImage \
		-no-reboot -initrd rootfs-armv7a.cpio \
		-m 256 -display none -serial null \
		--append 'rdinit=/sbin/init earlycon=ec_imx6q,mmio,0x21e8000,115200n8 console=ttymxc1,115200'
		-dtb arch/arm/boot/dts/imx6ul-14x14-evk.dtb \
		-nographic -monitor null -serial stdio

qemu has to be v3.1 or later to support the machine.

Hope this helps,
Guenter