linux-kernel - Re: [PATCH v15 23/26] sched: early boot clock (was Re: Bug#918036: linux: uptime after reboot wrong (kvm-clock related?))

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Message-ID: <Pine.BSM.4.64L.1901040722540.14540@herc.mirbsd.org>
Date:   Fri, 4 Jan 2019 07:30:42 +0000 (UTC)
From:   Thorsten Glaser <t.glaser@...ent.de>
To:     Salvatore Bonaccorso <carnil@...ian.org>, 918036@...s.debian.org,
        Pavel Tatashin <pasha.tatashin@...een.com>
cc:     Steven Sistare <steven.sistare@...cle.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        linux@...linux.org.uk, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, john.stultz@...aro.org,
        sboyd@...eaurora.org, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>, mingo@...hat.com,
        Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
        douly.fnst@...fujitsu.com, Peter Zijlstra <peterz@...radead.org>,
        prarit@...hat.com, feng.tang@...el.com, pmladek@...e.com,
        gnomes@...rguk.ukuu.org.uk, linux-s390@...r.kernel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com, pbonzini@...hat.com,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org
Subject: Re: [PATCH v15 23/26] sched: early boot clock (was Re: Bug#918036:
 linux: uptime after reboot wrong (kvm-clock related?))

Hi Salvatore,

>p.s.: my earlier reply to you seem to have been rejected and never
>      reached you, hope this one does now.

if you sent from Googlemail, it may reach me in the next weeks or
never *shrug* they don’t play nice with greylisting. The -submitter
or @d.o works, though. I’m following up from my $dayjob address as
the issue occurred there (which is also Googlemail, unfortunately).

>There was now a followup on this, and if you can I think it's best if
>you can followup there.
>
>https://lore.kernel.org/lkml/CA+CK2bC70pnL0Wimb0xt99J4nNfi8W3zuUHgAk-jsPuOP9jpHA@mail.gmail.com/

OK, doing now:


Pavel Tatashin wrote:

>Could you please send the config file and qemu arguments that were
>used to reproduce this problem.

This is from a libvirt-managed system. The arguments as shown by
“ps axwww” are:

qemu-system-x86_64 -enable-kvm -name ci-busyapps -S -machine pc-1.1,accel=kvm,usb=off -m 8192 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 09536d92-dd73-8993-78fb-e0c885acf763 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/ci-busyapps.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/dev/vms/ci-busyapps,format=raw,if=none,id=drive-virtio-disk0,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=25 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:05:6e:fd,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on

I’ve attached the kernel configuration; this is a stock Debian
unstable/amd64 system, just upgraded. After upgrading the guest,
I merely issued a “reboot” in the guest and did not stop/start
qemu.

The host is Debian jessie/amd64 (Linux 3.16.0-7-amd64 / 3.16.59-1)
in case that matters.

Thanks,
//mirabilos
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