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[Po-Hsu Lin <2029405@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Jammy)
       Status: New => In Progress

** Changed in: linux (Ubuntu Jammy)
     Assignee: (unassigned) => Po-Hsu Lin (cypressyew)

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https://bugs.launchpad.net/bugs/2029405

Title:
  ftrace:test.d--event--subsystem-enable.tc fails with timeout on
  focal:linux-hwe-5.15 ARM64

Status in ubuntu-kernel-tests:
  In Progress
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Jammy:
  In Progress

Bug description:
  First time seen this since ftrace refactor out from
  ubuntu_kernel_selftests to ubuntu-kselftests-ftrace

  Issue found on ARM64 nodes with both generic / generic-64k kernel.

  Partial test log:
   Running './ftracetest -vvv test.d/event/subsystem-enable.tc'
   === Ftrace unit tests ===
   ....
   [1] event tracing - enable/disable with event level files
   + [ 2 -eq 1 ]
   + [ -f set_event_pid ]
   + echo
   + [ -f set_ftrace_pid ]
   + echo
   + [ -f set_ftrace_notrace ]
   + echo
   + [ -f set_graph_function ]
   + echo
   + tee set_graph_function set_graph_notrace 
   + [ -f stack_trace_filter ]
   + echo
   + [ -f kprobe_events ]
   + echo
   + [ -f uprobe_events ]
   + echo
   + [ -f synthetic_events ]
   + echo
   + [ -f snapshot ]
   + echo 0
   + clear_trace
   + echo
   + enable_tracing
   + echo 1
   + . /home/ubuntu/autotest/client/tmp/ubuntu_kselftests_ftrace/src/linux/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
   + echo sched:sched_switch
   + yield
   + ping 127.0.0.1 -c 1
   PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
   64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.096 ms
   
   --- 127.0.0.1 ping statistics ---
   1 packets transmitted, 1 received, 0% packet loss, time 0ms
   rtt min/avg/max/mdev = 0.096/0.096/0.096/0.000 ms
   + cat trace
   + grep sched_switch
   + wc -l
   Timer expired (600 sec.), nuking pid 20982

  From the code (tools/testing/selftests/ftrace/test.d/event/event-
  enable.tc) this test is trying to run:

      count=`cat trace | grep sched_switch | wc -l`

  This command caused the timeout as `cat trace` seems to be never
  ending.

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