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[Po-Hsu Lin <1878877@xxxxxxxxxxxxxxxxxx>]

Despite we're having this fs_fill failure on XFS (bug 2024161) after LTP
test suite update, this issue with btrfs is still visible on some
instances / kernels

e.g. n2d-standard-2 with b-gcp-5.4.0-1111.120~18.04.1

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https://bugs.launchpad.net/bugs/1878877

Title:
  fs_fill in fs from ubuntu_ltp failed with ENOSPC when testing btrfs on
  B-5.3 ARM64 / P9, B-5.4, H-5.11 aws

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on B-5.3 with arm64 node appleton-kernel (5.3.0-53.47~18.04.1-generic)
  This issue cannot be found on amd64 / i386 / P8 node (on P8 it's failing with TIMEOUT, bug 1878763), but can be found on another P9 node (baltar)

   tst_test.c:1316: TINFO: Testing on btrfs
   tst_mkfs.c:90: TINFO: Formatting /dev/loop2 with btrfs opts='' extra opts=''
   tst_test.c:1250: TINFO: Timeout per run is 0h 05m 00s
   fs_fill.c:103: TINFO: Running 10 writer threads
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   tst_fill_fs.c:59: TINFO: write(): ENOSPC (28)
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread9/file0
   tst_fill_fs.c:39: TINFO: open(): ENOSPC (28)
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread4/file0
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread7/file0
   tst_fill_fs.c:59: TINFO: write(): ENOSPC (28)
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread2/file0
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread6/file0
   fs_fill.c:53: TINFO: Unlinking mntpoint/thread10/file0
   safe_macros.c:366: TBROK: fs_fill.c:55: unlink(mntpoint/thread4/file0) failed: ENOSPC (28)

  Please find attachment for the test log.

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