[Bug 1888303] Re: Intermittent buggines with user mode emulation of x86-64 on aarch64

[Thomas Huth]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" within the next 60 days (otherwise it will get
closed as "Expired"). We will then eventually migrate the ticket auto-
matically to the new system (but you won't be the reporter of the bug
in the new system and thus won't get notified on changes anymore).

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1888303

Title:
  Intermittent buggines with user mode emulation of x86-64 on aarch64

Status in QEMU:
  Incomplete

Bug description:
  QEMU Version: 5.0.0
  ./configure --target-list=x86_64-linux-user --enable-user --prefix=/opt/qemu 
--static

  Testing using node_exporter from pmm-client-1.17.4-1.el8.x86_64.rpm

  aarch64 system is running CentOS 8 with a mainline 5.4.52 kernel built
  for 4KB memory pages.

  On aarch64 machine, invoke:

  ./qemu-x86_64-static /usr/local/percona/pmm-
  client/node_exporter.x86_64 -web.listen-address=192.168.0.10:42000
  -web.auth-file=/usr/local/percona/pmm-client/pmm.yml -web.ssl-key-
  file=/usr/local/percona/pmm-client/server.key -web.ssl-cert-
  file=/usr/local/percona/pmm-client/server.crt
  
-collectors.enabled=diskstats,filefd,filesystem,loadavg,meminfo,netdev,netstat,stat,time,uname,vmstat,meminfo_numa,textfile

  Most of the time it will outright segfault within a few seconds,
  seemingly when the prometheus server polls for data.

  But, about once every 10 times, it will not sefault and will continue
  working just fine forever.

  The dynamically linked version of qemu (built without --static) always
  works without segfaulting, but it just doesn't work, the prometheus
  server gets no data from it. Again, once in a while it will work, but
  even when it doesn't work it won't segfault.

  This vaguely feels like a memory alignment issue somewhere, but my
  debug-fu is not quite strong enough to attack the problem.

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