Patch applied
http://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=b258273b1670d0623535fbf495f91f80b51f849a

Just need to check if this can be reproduced or not.

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https://bugs.launchpad.net/bugs/1782114

Title:
  ubuntu_ramfs_stress OOM on 4.15 KVM kernel

Status in ubuntu-kernel-tests:
  New
Status in linux-kvm package in Ubuntu:
  New
Status in stress-ng package in Ubuntu:
  New

Bug description:
  This test will fail with the 4.15 kvm kernel in -release.
  Therefore this might not be a kernel regression but a tool issue.

  Complete syslog output can be found here:
  https://pastebin.ubuntu.com/p/tYTf8gh5ft/

  Test output:
  10:13:57 DEBUG| [stdout] Stress test:   
/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-ng/stress-ng 
--verify --times --metrics-brief --syslog --keep-name -t 15s --hdd 4 --hdd-opts 
sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --link 4 --symlink 4 --lockf 4 --seek 
4 --aio 4 --aio-requests 32 --dentry 4 --dir 4 --dentry-order stride 
--fallocate 4 --fstat 4 --dentries 65536 --io 1 --lease 4 --mmap 0 --mmap-file 
--mmap-async --open 4 --rename 4 --hdd-bytes 32M --fallocate-bytes 32M --chdir 
4 --chmod 4 --filename 4 --rename 4 --mmap-bytes 32M --hdd-write-size 512
  10:13:57 DEBUG| [stdout] Mount point:   /mnt/ramfs-test-1002
  10:13:57 DEBUG| [stdout] Date:          Tue Jul 17 10:13:57 UTC 2018
  10:13:57 DEBUG| [stdout] Host:          harpo
  10:13:57 DEBUG| [stdout] Kernel:        4.15.0-1011-kvm #11-Ubuntu SMP Fri 
May 25 08:24:07 UTC 2018
  10:13:57 DEBUG| [stdout] Machine:       harpo x86_64 x86_64
  10:13:57 DEBUG| [stdout] CPUs online:   2
  10:13:57 DEBUG| [stdout] CPUs total:    2
  10:13:57 DEBUG| [stdout] Page size:     4096
  10:13:57 DEBUG| [stdout] Pages avail:   216098
  10:13:57 DEBUG| [stdout] Pages total:   255157
  10:13:57 DEBUG| [stdout] 
--------------------------------------------------------------------------------
  10:13:57 DEBUG| [stdout]  
  10:13:57 DEBUG| [stdout]  
  10:13:57 DEBUG| [stdout] stress-ng: info:  [1024] dispatching hogs: 4 hdd, 4 
link, 4 symlink, 4 lockf, 4 seek, 4 aio, 4 dentry, 4 dir, 4 fallocate, 4 fstat, 
1 io, 4 lease, 2 mmap, 4 open, 4 rename, 4 chdir, 4 chmod, 4 filename, 4 rename
  10:14:13 ERROR| Exception escaping from test:
  Traceback (most recent call last):
    File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      _call_test_function(self.execute, *p_args, **p_dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 823, in 
_call_test_function
      return func(*args, **dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
      postprocess_profiled_run, args, dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 212, in 
_call_run_once
      self.run_once(*args, **dargs)
    File 
"/home/ubuntu/autotest/client/tests/ubuntu_ramfs_stress/ubuntu_ramfs_stress.py",
 line 70, in run_once
      self.results = utils.system_output(cmd, retain_output=True)
    File "/home/ubuntu/autotest/client/shared/utils.py", line 1267, in 
system_output
      verbose=verbose, args=args).stdout
    File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
      "Command returned non-zero exit status")
  CmdError: Command <LOG=/tmp/ramfs-falure.log 
STRESS_NG=/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-ng/stress-ng
 DURATION=15s bash -c 
/home/ubuntu/autotest/client/tests/ubuntu_ramfs_stress/ubuntu_ramfs_stress.sh 
/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src 2>&1> failed, rc=-9, 
Command returned non-zero exit status
  * Command: 
      LOG=/tmp/ramfs-falure.log
      STRESS_NG=/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-
      ng/stress-ng DURATION=15s bash -c /home/ubuntu/autotest/client/tests/ubunt
      u_ramfs_stress/ubuntu_ramfs_stress.sh
      /home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src 2>&1
  Exit status: -9
  Duration: 15.3993020058

  stdout:
   
  
--------------------------------------------------------------------------------
  Stress test:   
/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-ng/stress-ng 
--verify --times --metrics-brief --syslog --keep-name -t 15s --hdd 4 --hdd-opts 
sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --link 4 --symlink 4 --lockf 4 --seek 
4 --aio 4 --aio-requests 32 --dentry 4 --dir 4 --dentry-order stride 
--fallocate 4 --fstat 4 --dentries 65536 --io 1 --lease 4 --mmap 0 --mmap-file 
--mmap-async --open 4 --rename 4 --hdd-bytes 32M --fallocate-bytes 32M --chdir 
4 --chmod 4 --filename 4 --rename 4 --mmap-bytes 32M --hdd-write-size 512
  Mount point:   /mnt/ramfs-test-1002
  Date:          Tue Jul 17 10:13:57 UTC 2018
  Host:          harpo
  Kernel:        4.15.0-1011-kvm #11-Ubuntu SMP Fri May 25 08:24:07 UTC 2018
  Machine:       harpo x86_64 x86_64
  CPUs online:   2
  CPUs total:    2
  Page size:     4096
  Pages avail:   216098
  Pages total:   255157
  
--------------------------------------------------------------------------------
   
   
  stress-ng: info:  [1024] dispatching hogs: 4 hdd, 4 link, 4 symlink, 4 lockf, 
4 seek, 4 aio, 4 dentry, 4 dir, 4 fallocate, 4 fstat, 1 io, 4 lease, 2 mmap, 4 
open, 4 rename, 4 chdir, 4 chmod, 4 filename, 4 rename
  10:14:14 ERROR| child process failed
  10:14:14 DEBUG| Traceback (most recent call last):
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/parallel.py", line 25, 
in fork_start
  10:14:14 DEBUG|     l()
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/job.py", line 505, in 
<lambda>
  10:14:14 DEBUG|     l = lambda: test.runtest(self, url, tag, args, dargs)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/test.py", line 125, in 
runtest
  10:14:14 DEBUG|     job.sysinfo.log_after_each_iteration)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/test.py", line 
913, in runtest
  10:14:14 DEBUG|     mytest._exec(args, dargs)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/test.py", line 
411, in _exec
  10:14:14 DEBUG|     _call_test_function(self.execute, *p_args, **p_dargs)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/test.py", line 
823, in _call_test_function
  10:14:14 DEBUG|     return func(*args, **dargs)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/test.py", line 
291, in execute
  10:14:14 DEBUG|     postprocess_profiled_run, args, dargs)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/test.py", line 
212, in _call_run_once
  10:14:14 DEBUG|     self.run_once(*args, **dargs)
  10:14:14 DEBUG|   File 
"/home/ubuntu/autotest/client/tests/ubuntu_ramfs_stress/ubuntu_ramfs_stress.py",
 line 70, in run_once
  10:14:14 DEBUG|     self.results = utils.system_output(cmd, 
retain_output=True)
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/utils.py", line 
1267, in system_output
  10:14:14 DEBUG|     verbose=verbose, args=args).stdout
  10:14:14 DEBUG|   File "/home/ubuntu/autotest/client/shared/utils.py", line 
918, in run
  10:14:14 DEBUG|     "Command returned non-zero exit status")
  10:14:14 DEBUG| CmdError: Command <LOG=/tmp/ramfs-falure.log 
STRESS_NG=/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-ng/stress-ng
 DURATION=15s bash -c 
/home/ubuntu/autotest/client/tests/ubuntu_ramfs_stress/ubuntu_ramfs_stress.sh 
/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src 2>&1> failed, rc=-9, 
Command returned non-zero exit status
  10:14:14 DEBUG| * Command: 
  10:14:14 DEBUG|     LOG=/tmp/ramfs-falure.log
  10:14:14 DEBUG|     
STRESS_NG=/home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src/stress-
  10:14:14 DEBUG|     ng/stress-ng DURATION=15s bash -c 
/home/ubuntu/autotest/client/tests/ubunt
  10:14:14 DEBUG|     u_ramfs_stress/ubuntu_ramfs_stress.sh
  10:14:14 DEBUG|     /home/ubuntu/autotest/client/tmp/ubuntu_ramfs_stress/src 
2>&1
  10:14:14 DEBUG| Exit status: -9
  10:14:14 DEBUG| Duration: 15.3993020058

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-1011-kvm 4.15.0-1011.11
  ProcVersionSignature: User Name 4.15.0-1011.11-kvm 4.15.18
  Uname: Linux 4.15.0-1011-kvm x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Tue Jul 17 10:15:29 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)

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