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Date:   Tue, 11 Jul 2023 13:35:41 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Suren Baghdasaryan <surenb@google.com>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        Sachin Sant <sachinp@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>
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Subject: Re: [PATCH v4 00/33] Per-VMA locks
Message-ID: <20230711103541.GA190975@unreal>
References: <20230227173632.3292573-1-surenb@google.com>
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On Mon, Feb 27, 2023 at 09:35:59AM -0800, Suren Baghdasaryan wrote:

<...>

> Laurent Dufour (1):
>   powerc/mm: try VMA lock-based page fault handling first

Hi,

This series and specifically the commit above broke docker over PPC.
It causes to docker service stuck while trying to activate. Revert of
this commit allows us to use docker again.

[user@ppc-135-3-200-205 ~]# sudo systemctl status docker
=E2=97=8F docker.service - Docker Application Container Engine
     Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendo=
r preset: disabled)
     Active: activating (start) since Mon 2023-06-26 14:47:07 IDT; 3h 50min=
 ago
TriggeredBy: =E2=97=8F docker.socket
       Docs: https://docs.docker.com
   Main PID: 276555 (dockerd)
     Memory: 44.2M
     CGroup: /system.slice/docker.service
             =E2=94=94=E2=94=80 276555 /usr/bin/dockerd -H fd:// --containe=
rd=3D/run/containerd/containerd.sock

Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129383166+03:00" level=3Dinfo msg=3D"Graph migration to content-address=
ability took 0.00 se>
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129666160+03:00" level=3Dwarning msg=3D"Your kernel does not support cg=
roup cfs period"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129684117+03:00" level=3Dwarning msg=3D"Your kernel does not support cg=
roup cfs quotas"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129697085+03:00" level=3Dwarning msg=3D"Your kernel does not support cg=
roup rt period"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129711513+03:00" level=3Dwarning msg=3D"Your kernel does not support cg=
roup rt runtime"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129720656+03:00" level=3Dwarning msg=3D"Unable to find blkio cgroup in =
mounts"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.129805617+03:00" level=3Dwarning msg=3D"mountpoint for pids not found"
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.130199070+03:00" level=3Dinfo msg=3D"Loading containers: start."
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.132688568+03:00" level=3Dwarning msg=3D"Running modprobe bridge br_netf=
ilter failed with me>
Jun 26 14:47:07 ppc-135-3-200-205 dockerd[276555]: time=3D"2023-06-26T14:47=
:07.271014050+03:00" level=3Dinfo msg=3D"Default bridge (docker0) is assign=
ed with an IP addres>

Python script which we used for bisect:

import subprocess
import time
import sys


def run_command(cmd):
    print('running:', cmd)

    p =3D subprocess.Popen(cmd, shell=3DTrue, stdout=3Dsubprocess.PIPE, std=
err=3Dsubprocess.PIPE)

    try:
        stdout, stderr =3D p.communicate(timeout=3D30)

    except subprocess.TimeoutExpired:
        return True

    print(stdout.decode())
    print(stderr.decode())
    print('rc:', p.returncode)

    return False


def main():
    commands =3D [
        'sudo systemctl stop docker',
        'sudo systemctl status docker',
        'sudo systemctl is-active docker',
        'sudo systemctl start docker',
        'sudo systemctl status docker',
    ]

    for i in range(1000):
        title =3D f'Try no. {i + 1}'
        print('*' * 50, title, '*' * 50)

        for cmd in commands:
            if run_command(cmd):
                print(f'Reproduced on try no. {i + 1}!')
                print(f'"{cmd}" is stuck!')

                return 1

            print('\n')
        time.sleep(30)
    return 0

if __name__ =3D=3D '__main__':
    sys.exit(main())

Thanks