I'm hitting hangs when exercising /proc/bus/pci/0000:00/00.0 - i believe
after a specific amount of time the watchdog reboots the machine

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https://bugs.launchpad.net/bugs/1839461

Title:
  sysfs / procfs from ubuntu_stress_smoke_test failed on D-AWS ARM64

Status in linux-aws package in Ubuntu:
  New

Bug description:
  Issue found on arm64 node with D-AWS kernel

  sysfs failed on: a1.2xlarge / a1.large
  procfs failed on: a1.2xlarge / a1.medium

  
  sysfs failure:
          sysfs FAILED
          stress-ng: debug: [16876] 8 processors online, 8 processors configured
          stress-ng: info: [16876] dispatching hogs: 4 sysfs
          stress-ng: debug: [16876] cache allocate: reducing cache level from 
L3 (too high) to L2
          stress-ng: debug: [16876] cache allocate: default cache size: 2048K
          stress-ng: debug: [16876] starting stressors
          stress-ng: debug: [16877] stress-ng-sysfs: started [16877] (instance 
0)
          stress-ng: debug: [16878] stress-ng-sysfs: started [16878] (instance 
1)
          stress-ng: debug: [16876] 4 stressors spawned
          stress-ng: debug: [16879] stress-ng-sysfs: started [16879] (instance 
2)
          stress-ng: debug: [16880] stress-ng-sysfs: started [16880] (instance 
3)
          stress-ng: error: [16877] stress-ng-sysfs: A SIGSEGV occurred while 
exercising /sys/power/pm_print_times, aborting
          stress-ng: debug: [16877] stress-ng-sysfs: exited [16877] (instance 0)
          stress-ng: error: [16876] process 16877 (stress-ng-sysfs) terminated 
with an error, exit status=1 (stress-ng core failure)
          stress-ng: debug: [16876] process [16877] terminated
          stress-ng: error: [16878] stress-ng-sysfs: A SIGSEGV occurred while 
exercising /sys/kernel/irq/1/name, aborting
          stress-ng: debug: [16878] stress-ng-sysfs: exited [16878] (instance 1)
          stress-ng: error: [16876] process 16878 (stress-ng-sysfs) terminated 
with an error, exit status=1 (stress-ng core failure)
          stress-ng: debug: [16876] process [16878] terminated
          stress-ng: debug: [16879] stress-ng-sysfs: exited [16879] (instance 2)
          stress-ng: debug: [16876] process [16879] terminated
          stress-ng: debug: [16880] stress-ng-sysfs: exited [16880] (instance 3)
          stress-ng: debug: [16876] process [16880] terminated
          stress-ng: info: [16876] unsuccessful run completed in 5.04s

  procfs failure:
          procfs FAILED
          stress-ng: debug: [27728] 8 processors online, 8 processors configured
          stress-ng: info: [27728] dispatching hogs: 4 procfs
          stress-ng: debug: [27728] cache allocate: reducing cache level from 
L3 (too high) to L2
          stress-ng: debug: [27728] cache allocate: default cache size: 2048K
          stress-ng: debug: [27728] starting stressors
          stress-ng: debug: [27729] stress-ng-procfs: started [27729] (instance 
0)
          stress-ng: debug: [27730] stress-ng-procfs: started [27730] (instance 
1)
          stress-ng: debug: [27728] 4 stressors spawned
          stress-ng: debug: [27731] stress-ng-procfs: started [27731] (instance 
2)
          stress-ng: debug: [27732] stress-ng-procfs: started [27732] (instance 
3)
          *** stack smashing detected ***: terminated
          stress-ng: debug: [27730] stress-ng-procfs: exited [27730] (instance 
1)
          stress-ng: debug: [27729] stress-ng-procfs: exited [27729] (instance 
0)
          stress-ng: debug: [27728] process [27729] terminated
          stress-ng: debug: [27728] process [27730] terminated
          stress-ng: debug: [27728] process [27731] (stress-ng-procfs) 
terminated on signal: 6 (Aborted)
          stress-ng: debug: [27728] process [27731] terminated
          stress-ng: debug: [27732] stress-ng-procfs: exited [27732] (instance 
3)
          stress-ng: debug: [27728] process [27732] terminated
          stress-ng: info: [27728] unsuccessful run completed in 5.00s

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-5.0.0-1011-aws 5.0.0-1011.12
  ProcVersionSignature: User Name 5.0.0-1011.12-aws 5.0.15
  Uname: Linux 5.0.0-1011-aws aarch64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: arm64
  Date: Thu Aug  8 11:03:32 2019
  Ec2AMI: ami-0ac1a3bc4f5c85238
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-west-2c
  Ec2InstanceType: a1.medium
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  SourcePackage: linux-aws
  UpgradeStatus: No upgrade log present (probably fresh install)

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