Worked around the above issue, now hitting the underlying issue:

[  205.914807] CPU: 2 PID: 2685 Comm: stress-ng-sysfs Not tainted 
4.15.0-34-lowlatency #37~16.04.1-Ubuntu
[  205.914809] Hardware name: Dell Inc. PowerEdge R310/05XKKK, BIOS 1.8.2 
08/17/2011
[  205.914811] Call Trace:
[  205.914817]  dump_stack+0x58/0x81
[  205.914823]  dump_header+0x5a/0x251
[  205.914829]  ? has_ns_capability_noaudit+0x2c/0x40
[  205.914835]  ? ___ratelimit+0x9f/0xf0
[  205.914839]  oom_kill_process+0x227/0x420
[  205.914842]  out_of_memory+0xe1/0x2b0
[  205.914846]  __alloc_pages_slowpath+0xbdc/0xca0
[  205.914850]  __alloc_pages_nodemask+0x249/0x280
[  205.914855]  new_slab+0x4da/0x620
[  205.914859]  ___slab_alloc.constprop.76+0x4c0/0x580
[  205.914863]  ? seq_open+0x2d/0x80
[  205.914867]  ? kernfs_fop_open+0xbc/0x390
[  205.914872]  ? try_to_wake_up+0x45/0x460
[  205.914878]  ? mutex_spin_on_owner+0xa5/0xc0
[  205.914882]  __slab_alloc.isra.69.constprop.75+0x30/0x50
[  205.914885]  ? __slab_alloc.isra.69.constprop.75+0x30/0x50
[  205.914889]  kmem_cache_alloc_trace+0x17f/0x1c0
[  205.914892]  ? seq_open+0x2d/0x80
[  205.914896]  seq_open+0x2d/0x80
[  205.914899]  kernfs_fop_open+0x18d/0x390
[  205.914905]  do_dentry_open+0x1ca/0x2f0
[  205.914908]  ? kernfs_seq_start+0x90/0x90
[  205.914911]  vfs_open+0x41/0x70
[  205.914916]  path_openat+0x250/0x1240
[  205.914919]  ? getname_flags+0x3a/0x1a0
[  205.914924]  ? aa_file_perm+0x86/0x350
[  205.914927]  do_filp_open+0x68/0xe0
[  205.914930]  ? aa_file_perm+0x86/0x350
[  205.914935]  ? __alloc_fd+0x95/0x150
[  205.914938]  do_sys_open+0x111/0x2a0
[  205.914942]  ? mem_cgroup_oom_synchronize+0x350/0x360

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https://bugs.launchpad.net/bugs/1791246

Title:
  sysfs test in ubuntu_stress_smoke_test will hang on a X-HWE lowlatency
  node

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