RISC-V: crash in riscv_get_time()

[Heinrich Schuchardt]

Am 7. August 2020 13:11:25 MESZ schrieb Bin Meng <bmeng.cn at gmail.com>:
>On Fri, Aug 7, 2020 at 6:53 PM Heinrich Schuchardt <xypron.glpk at gmx.de>
>wrote:
>>
>> On 06.08.20 16:40, Bin Meng wrote:
>> > On Thu, Aug 6, 2020 at 10:28 PM Heinrich Schuchardt
><xypron.glpk at gmx.de> wrote:
>> >>
>> >> On 06.08.20 13:18, Rick Chen wrote:
>> >>> Hi Heinrich
>> >>>
>> >>>> From: Heinrich Schuchardt [mailto:xypron.glpk at gmx.de]
>> >>>> Sent: Thursday, August 06, 2020 6:45 PM
>> >>>> To: Bin Meng; Rick Jian-Zhi Chen(陳建志)
>> >>>> Cc: U-Boot Mailing List
>> >>>> Subject: RISC-V: crash in riscv_get_time()
>> >>>>
>> >>>> Hello Rick, hello Bin,
>> >>>>
>> >>>> when I run qemu-riscv64_defconfig using
>> >>>>
>> >>>> qemu-system-riscv64 -machine virt -m 1G -nographic \
>> >>>>         -bios u-boot \
>> >>>>         -device virtio-net-device,netdev=net0 \
>> >>>>         -netdev user,id=net0,tftp=tftp
>> >>>>
>> >>>> a crash occurs in riscv_get_time() when executing readq().
>> >>>>
>> >>>> $ qemu-system-riscv64 --version
>> >>>> QEMU emulator version 5.0.0 (Debian 1:5.0-13)
>> >>>>
>> >>>> Looking at doc/board/emulation/qemu-riscv.rst this should work.
>> >>>>
>> >>>> Is there something missing in the documentation?
>> >>>>
>> >>>
>> >>> You can try this
>> >>> ./qemu-system-riscv64 -nographic -machine virt -bios u-boot
>-device
>> >>> virtio-net-device,netdev=net0 -netdev user,id=net0,tftp=tftp
>> >>>
>> >>> It can work as below:
>> >>>
>> >>> U-Boot 2020.10-rc1-00299-g89150a9 (Aug 06 2020 - 19:14:01 +0800)
>> >>>
>> >>> CPU:   rv64imafdcsu
>> >>> Model: riscv-virtio,qemu
>> >>> DRAM:  128 MiB
>> >>> In:    uart at 10000000
>> >>> Out:   uart at 10000000
>> >>> Err:   uart at 10000000
>> >>> Net:   eth0: virtio-net#0
>> >>> Hit any key to stop autoboot:  0
>> >>> => help
>> >>
>> >> But on Debian Bullseye it fails:
>> >>
>> >> $ git reset --hard origin/master
>> >> $ make mrproper
>> >> $ make qemu-riscv64_defconfig
>> >> $ export CROSS_COMPILE
>> >> $ export CROSS_COMPILE=riscv64-linux-gnu-
>> >> $ qemu-system-riscv64 -nographic -machine virt \
>> >>> -bios u-boot \
>> >>> -device virtio-net-device,netdev=net0 \
>> >>> -netdev user,id=net0,tftp=tftp
>> >>
>> >
>> > Just rebuilt a QEMU 5.0.0 on Ubuntu 16.04 and cannot reproduce.
>> > Something is wrong with Debian?
>> >
>> > Regards,
>> > Bin
>> >
>> I can confirm that with an unpatched QEMU v5.0.0 no problem occurs.
>> Same with QEMU 5.0.93 (v5.1.0-rc3-dirty).
>
>Unpatched QEMU? Do you mean Debian shipped a patched QEMU? If so, what
>is patched?
>

See http://deb.debian.org/debian/pool/main/q/qemu/qemu_5.0-13.debian.tar.xz directory debian/patches.


>Regards,
>Bin