[Qemu-devel] [Bug 1766904] [NEW] Creating high hdd load (with constant fsyncs) on a SATA disk leads to freezes and errors in guest dmesg

[xccx]

Public bug reported:

After upgrading from qemu 2.10.0+dfsg-2 to 2.12~rc3+dfsg-2 (on debian
sid host), centos 7 guest started to show freezes and ata errors in
dmesg during hdd workloads with writing many small files and repeated
fsyncs.

Host kernel 4.15.0-3-amd64.
Guest kernel 3.10.0-693.21.1.el7.x86_64 (slightly older guest kernel was tested 
too with same result).

Script that reproduces the bug (first run usualy goes smooth, second and
later runs result in dmesg errors and freezes):

http://paste.debian.net/hidden/472fb220/

Sample of error messages in guest dmesg:

http://paste.debian.net/hidden/8219e234/

This vm is launchd using virsh start. VM launch command (from logfile in
/var/log/libvirt/qemu/):

http://paste.debian.net/plainh/5604126f

A workaround that I am using right now: I have detached this SATA
storage and reattached the same .qcow2 file as SCSI - this has fixed the
issue for me.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1766904

Title:
  Creating high hdd load (with constant fsyncs) on a SATA disk leads to
  freezes and errors in guest dmesg

Status in QEMU:
  New

Bug description:
  After upgrading from qemu 2.10.0+dfsg-2 to 2.12~rc3+dfsg-2 (on debian
  sid host), centos 7 guest started to show freezes and ata errors in
  dmesg during hdd workloads with writing many small files and repeated
  fsyncs.

  Host kernel 4.15.0-3-amd64.
  Guest kernel 3.10.0-693.21.1.el7.x86_64 (slightly older guest kernel was 
tested too with same result).

  Script that reproduces the bug (first run usualy goes smooth, second
  and later runs result in dmesg errors and freezes):

  http://paste.debian.net/hidden/472fb220/

  Sample of error messages in guest dmesg:

  http://paste.debian.net/hidden/8219e234/

  This vm is launchd using virsh start. VM launch command (from logfile
  in /var/log/libvirt/qemu/):

  http://paste.debian.net/plainh/5604126f

  A workaround that I am using right now: I have detached this SATA
  storage and reattached the same .qcow2 file as SCSI - this has fixed
  the issue for me.

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