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[Po-Hsu Lin <2051352@xxxxxxxxxxxxxxxxxx>]

Found on AWS t3a.2xlarge with Jammy 6.8.0-1010.10~22.04.2

** Tags added: 6.8 sru-s20240429

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https://bugs.launchpad.net/bugs/2051352

Title:
  posix_ipc test from test_regression_testsuite of ubuntu_qrt_apparmor
  failed with F-aws-5.15 T3A (could not mq_notify: Connection timed out)

Status in QA Regression Testing:
  New
Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on AWS AMD 64 instance t3a.2xlarge with:
   * F-aws-5.15.0-1053.58~20.04.1
   * J-aws-5.15.0-1053.58 

  This is reproducible, 4 out of 4 attempts on
  F-aws-5.15.0-1053.58~20.04.1

  There is no such issue on t3a.2xlarge with
  F-aws-5.15.0-1052.57~20.04.1 nor J-aws-5.15.0-1052.57. Therefore it
  appears to be a possible regression.

  The posix_ipc test in test_regression_testsuite will fail with:
    Error: posix_mq_rcv failed. Test 'POSIX MQUEUE (confined receiver root - unconfined sender : mq_notify)' was expected to 'pass'. Reason for failure 'FAIL - could not mq_notify: Connection timed out'

  Test log:
  ubuntu@t3a:~/testlibp8PXk0/source/focal/apparmor-2.13.3/tests/regression/apparmor$ sudo bash posix_ipc.sh
  Error: posix_mq_rcv failed. Test 'POSIX MQUEUE (confined root - mqueue : mq_notify)' was expected to 'pass'. Reason for failure 'FAIL - could not mq_notify: Connection timed out'
  xpass: POSIX MQUEUE (confined root - mqueue label 1)
  xpass: POSIX MQUEUE (confined root - mqueue label 1 : mq_notify)
  xpass: POSIX MQUEUE (confined root - mqueue label 1 : select)
  xpass: POSIX MQUEUE (confined root - mqueue label 1 : poll)
  xpass: POSIX MQUEUE (confined root - mqueue label 1 : epoll)
  xpass: POSIX MQUEUE (confined root - mqueue label 2)
  xpass: POSIX MQUEUE (confined root - mqueue label 2 : mq_notify)
  xpass: POSIX MQUEUE (confined root - mqueue label 2 : select)
  xpass: POSIX MQUEUE (confined root - mqueue label 2 : poll)
  xpass: POSIX MQUEUE (confined root - mqueue label 2 : epoll)
  Error: posix_mq_rcv failed. Test 'POSIX MQUEUE (confined 1001 - mqueue : mq_notify)' was expected to 'pass'. Reason for failure 'FAIL - could not mq_notify: Connection timed out'
  Error: posix_mq_rcv failed. Test 'POSIX MQUEUE (confined receiver 1001 - unconfined sender : mq_notify)' was expected to 'pass'. Reason for failure 'FAIL - could not mq_notify: Connection timed out'
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 1)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 1 : mq_notify)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 1 : select)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 1 : poll)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 1 : epoll)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 2)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 2 : mq_notify)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 2 : select)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 2 : poll)
  xpass: POSIX MQUEUE (confined 1001 - mqueue label 2 : epoll)

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