[next]: LTP: getxattr05.c:97: TFAIL: unshare(CLONE_NEWUSER) failed: ENOSPC (28)

[Naresh Kamboju]

While testing LTP syscalls with Linux next 20220110 (and till date 20220112)
on x86_64, i386, arm and arm64 the following tests failed.

tst_test.c:1365: TINFO: Timeout per run is 0h 15m 00s
getxattr05.c:87: TPASS: Got same data when acquiring the value of
system.posix_acl_access twice
getxattr05.c:97: TFAIL: unshare(CLONE_NEWUSER) failed: ENOSPC (28)
tst_test.c:391: TBROK: Invalid child (13545) exit value 1

fanotify17.c:176: TINFO: Test #1: Global groups limit in privileged user ns
fanotify17.c:155: TFAIL: unshare(CLONE_NEWUSER) failed: ENOSPC (28)
tst_test.c:391: TBROK: Invalid child (14739) exit value 1

sendto03.c:48: TBROK: unshare(268435456) failed: ENOSPC (28)

setsockopt05.c:45: TBROK: unshare(268435456) failed: ENOSPC (28)

strace output:
--------------
[pid   481] wait4(-1, 0x7fff52f5ae8c, 0, NULL) = -1 ECHILD (No child processes)
[pid   481] clone(child_stack=NULL,
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x7f3af0fa7a10) = 483
strace: Process 483 attached
[pid   481] wait4(-1,  <unfinished ...>
[pid   483] unshare(CLONE_NEWUSER)      = -1 ENOSPC (No space left on device)

metadata:
  git branch: master
  git repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git commit: 57c149e506d5bec1b845ad1a8a631063fcac1f6e
  git describe: next-20220110
  arch: x86
  toolchain: gcc-11

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

GOOD: next-20220107
 BAD:    next-20220110

Test logs:
https://lkft.validation.linaro.org/scheduler/job/4301888#L1474
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20220110/testrun/7253656/suite/ltp-syscalls-tests/test/getxattr05/log

compare test history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20220112/testrun/7277164/suite/ltp-syscalls-tests/test/getxattr05/history/

kernel-config:
https://builds.tuxbuild.com/23V6AwGvHW7H3kr6WxZZwueajVS/config

We are investigating this regression.

Steps to reproduce:
   # cd /opt/ltp
   # ./runltp -s getxattr05

--
Linaro LKFT
https://lkft.linaro.org