hugeshmctl01 passed with Bionic 4.15.0-92 AMD64 node amaura.

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https://bugs.launchpad.net/bugs/1866196

Title:
  hugeshmctl01 from hugetlb in ubuntu_ltp failed on B / E

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Issue found on Bionic, across amd64 / arm64 / i386 / P8 / s390x

  <<<test_start>>>
  tag=hugeshmctl01 stime=1583419276
  cmdline="hugeshmctl01 -i 5"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_test.c:1229: INFO: Timeout per run is 0h 05m 00s
  mem.c:817: INFO: set nr_hugepages to 128
  hugeshmctl01.c:198: PASS: pid, size, # of attaches and mode are correct - 
pass #0
  hugeshmctl01.c:198: PASS: pid, size, # of attaches and mode are correct - 
pass #1
  hugeshmctl01.c:263: PASS: new mode and change time are correct
  hugeshmctl01.c:280: PASS: shmctl in func_rmid() failed as expected, shared 
memory appears to be removed
  tst_checkpoint.c:149: BROK: hugeshmctl01.c:152: tst_checkpoint_wait(0, 
10000): ETIMEDOUT (110)
  mem.c:817: INFO: set nr_hugepages to 0

  Summary:
  passed   4
  failed   0
  skipped  0
  warnings 0
  <<<execution_status>>>
  initiation_status="ok"
  duration=11 termination_type=exited termination_id=2 corefile=no
  cutime=0 cstime=0
  <<<test_end>>>

  dmesg on s2lp3:
  [84600.210919] BUG: non-zero pgtables_bytes on freeing mm: 16384
  [84600.211628] BUG: non-zero pgtables_bytes on freeing mm: 16384
  [84601.361848] LTP: starting hugeshmctl01 (hugeshmctl01 -i 5)
  [84602.435421] User process fault: interruption code 003b ilc:2 in 
hugeshmctl01[2aa33f00000+25000]
  [84602.435435] Failing address: 0000020000000000 TEID: 0000020000000400
  [84602.435437] Fault in primary space mode while using user ASCE.
  [84602.435439] AS:000000079ec141c7 R3:0000000000000024
  [84602.435444] CPU: 3 PID: 74199 Comm: hugeshmctl01 Tainted: P           O    
 4.15.0-91-generic #92-Ubuntu
  [84602.435445] Hardware name: IBM 2964 N63 400 (LPAR)
  [84602.435447] User PSW : 00000000a994e531 00000000a60b6ea2
  [84602.435449]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:2 PM:0 
RI:0 EA:3
  [84602.435450] User GPRS: 0000000000000000 000002aa00000002 0000000000000000 
0000000000000004
  [84602.435451]            000002aa33f06602 000003ffb679ecf8 0000000000000000 
0000000000000000
  [84602.435452]            000003ff00000002 000002aa00000000 000002aa00000000 
0000020000000000
  [84602.435453]            000003ffb69a6000 000002aa33f1b300 000002aa33f06602 
000003ffd6d7dfa8
  [84602.435462] User Code: 000002aa33f06640: e31010000012      lt      
%r1,0(%r1)
                            000002aa33f06646: a7840038          brc     
8,000002aa33f066b6
                           #000002aa33f0664a: c4b80001061b      lgrl    
%r11,000002aa33f27280
                           >000002aa33f06650: 50a0b000          st      
%r10,0(%r11)
                            000002aa33f06654: a7690001          lghi    %r6,1
                            000002aa33f06658: a7590000          lghi    %r5,0
                            000002aa33f0665c: a7490000          lghi    %r4,0
                            000002aa33f06660: a739008d          lghi    %r3,141
  [84602.435472] Last Breaking-Event-Address:
  [84602.435476]  [<000002aa33f06602>] 0x2aa33f06602

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-91-generic 4.15.0-91.92
  ProcVersionSignature: Ubuntu 4.15.0-91.92-generic 4.15.18
  Uname: Linux 4.15.0-91-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.11
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Thu Mar  5 14:41:35 2020
  HibernationDevice: RESUME=UUID=e2735dd1-cbbc-4424-9c25-d37d073d9414
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:

  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=38f7d570-2973-4055-b668-12a9ace1e0c7 
crashkernel=196M audit=0 BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-91-generic N/A
   linux-backports-modules-4.15.0-91-generic  N/A
   linux-firmware                             1.173.16
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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