** Summary changed:

- ftrace test failed with Register/unregister many kprobe events in 
ubuntu_kernel_selftests on B-AWS-5.0
+ ftrace test failed with Register/unregister many kprobe events in 
ubuntu_kernel_selftests on B-AWS-5.0 / E

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https://bugs.launchpad.net/bugs/1866972

Title:
  ftrace test failed with Register/unregister many kprobe events in
  ubuntu_kernel_selftests on B-AWS-5.0 / E

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  Incomplete

Bug description:
  Issue found on c4.large with 5.0.0-1027.30-aws

  Test failed with:
  [42] Register/unregister many kprobe events   [FAIL]

   selftests: ftrace: ftracetest
   ========================================
   === Ftrace unit tests ===
   [1] Basic trace file check   [PASS]
   [2] Basic test for tracers   [PASS]
   [3] Basic trace clock test   [PASS]
   [4] Basic event tracing check        [PASS]
   [5] Change the ringbuffer size       [PASS]
   [6] Snapshot and tracing setting     [PASS]
   [7] trace_pipe and trace_marker      [PASS]
   [8] Generic dynamic event - add/remove kprobe events [PASS]
   [9] Generic dynamic event - add/remove synthetic events      [PASS]
   [10] Generic dynamic event - selective clear (compatibility) [PASS]
   [11] Generic dynamic event - generic clear event     [PASS]
   [12] event tracing - enable/disable with event level files   [PASS]
   [13] event tracing - restricts events based on pid   [PASS]
   [14] event tracing - enable/disable with subsystem level files       [PASS]
   [15] event tracing - enable/disable with top level files     [PASS]
   [16] Test trace_printk from module   [UNRESOLVED]
   [17] ftrace - function graph filters with stack tracer       [PASS]
   [18] ftrace - function graph filters [PASS]
   [19] ftrace - function pid filters   [PASS]
   [20] ftrace - stacktrace filter command      [PASS]
   [21] ftrace - function trace with cpumask    [PASS]
   [22] ftrace - test for function event triggers       [PASS]
   [23] ftrace - function trace on module       [UNRESOLVED]
   [24] ftrace - function profiling     [PASS]
   [25] ftrace - function profiler with function tracing        [PASS]
   [26] ftrace - test reading of set_ftrace_filter      [PASS]
   [27] ftrace - test for function traceon/off triggers [PASS]
   [28] Test creation and deletion of trace instances while setting an event    
[PASS]
   [29] Test creation and deletion of trace instances   [PASS]
   [30] Kprobe dynamic event - adding and removing      [PASS]
   [31] Kprobe dynamic event - busy event check [PASS]
   [32] Kprobe dynamic event with arguments     [PASS]
   [33] Kprobe event with comm arguments        [PASS]
   [34] Kprobe event string type argument       [PASS]
   [35] Kprobe event symbol argument    [PASS]
   [36] Kprobe event argument syntax    [PASS]
   [37] Kprobes event arguments with types      [PASS]
   [38] Kprobe event auto/manual naming [PASS]
   [39] Kprobe dynamic event with function tracer       [PASS]
   [40] Kretprobe dynamic event with arguments  [PASS]
   [41] Kretprobe dynamic event with maxactive  [PASS]
   [42] Register/unregister many kprobe events  [FAIL]
   [43] Kprobe dynamic event - adding and removing      [PASS]
   [44] test for the preemptirqsoff tracer      [UNSUPPORTED]
   [45] Test wakeup tracer      [PASS]
   [46] Test wakeup RT tracer   [PASS]
   [47] event trigger - test extended error support     [PASS]
   [48] event trigger - test field variable support     [PASS]
   [49] event trigger - test multiple actions on hist trigger   [PASS]
   [50] event trigger - test inter-event histogram trigger onmatch action       
[PASS]
   [51] event trigger - test inter-event histogram trigger onmatch-onmax action 
[PASS]
   [52] event trigger - test inter-event histogram trigger onmax action [PASS]
   [53] event trigger - test synthetic_events syntax parser     [PASS]
   [54] event trigger - test event enable/disable trigger       [PASS]
   [55] event trigger - test trigger filter     [PASS]
   [56] event trigger - test histogram modifiers        [PASS]
   [57] event trigger - test multiple histogram triggers        [PASS]
   [58] event trigger - test snapshot-trigger   [PASS]
   [59] event trigger - test stacktrace-trigger [PASS]
   [60] trace_marker trigger - test snapshot trigger    [PASS]
   [61] trace_marker trigger - test histogram with synthetic event against 
kernel event [PASS]
   [62] trace_marker trigger - test histogram with synthetic event      [PASS]
   [63] event trigger - test traceon/off trigger        [PASS]
   [64] (instance) Basic test for tracers       [PASS]
   [65] (instance) Basic trace clock test       [PASS]
   [66] (instance) Change the ringbuffer size   [PASS]
   [67] (instance) Snapshot and tracing setting [PASS]
   [68] (instance) trace_pipe and trace_marker  [PASS]
   [69] (instance) event tracing - enable/disable with event level files        
[PASS]
   [70] (instance) event tracing - restricts events based on pid        [PASS]
   [71] (instance) event tracing - enable/disable with subsystem level files    
[PASS]
   [72] (instance) ftrace - stacktrace filter command   [PASS]
   [73] (instance) ftrace - test for function event triggers    [PASS]
   [74] (instance) ftrace - test for function traceon/off triggers      [PASS]
   [75] (instance) event trigger - test event enable/disable trigger    [PASS]
   [76] (instance) event trigger - test trigger filter  [PASS]
   [77] (instance) event trigger - test histogram modifiers     [PASS]
   [78] (instance) event trigger - test multiple histogram triggers     [PASS]
   [79] (instance) trace_marker trigger - test snapshot trigger [PASS]

  
   # of passed: 75
   # of failed: 1
   # of unresolved: 2
   # of untested: 0
   # of unsupported: 1
   # of xfailed: 0
   # of undefined(test bug): 0
   not ok 1..1 selftests: ftrace: ftracetest [FAIL]

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