Public bug reported:

do_softirq does not exist on preempt RT kernel.

This is causing a failure in ftrace:ftracetest which reports: "echo: I/O
error".

Failure is reported for step 32 in Jenkins job:


23:48:45 DEBUG| [stdout] # selftests: ftrace: ftracetest
23:48:45 DEBUG| [stdout] # === Ftrace unit tests ===
23:48:45 DEBUG| [stdout] # [1] Basic trace file check   [PASS]
23:48:49 DEBUG| [stdout] # [2] Basic test for tracers   [PASS]
23:48:49 DEBUG| [stdout] # [3] Basic trace clock test   [PASS]
23:48:49 DEBUG| [stdout] # [4] Basic event tracing check        [PASS]
23:48:50 DEBUG| [stdout] # [5] Change the ringbuffer size       [PASS]
23:48:50 DEBUG| [stdout] # [6] Snapshot and tracing setting     [PASS]
23:48:50 DEBUG| [stdout] # [7] trace_pipe and trace_marker      [PASS]
23:49:38 DEBUG| [stdout] # [8] Test ftrace direct functions against tracers     
[PASS]
23:49:57 DEBUG| [stdout] # [9] Test ftrace direct functions against kprobes     
[PASS]
23:49:57 DEBUG| [stdout] # [10] Generic dynamic event - add/remove eprobe 
events        [PASS]
23:49:57 DEBUG| [stdout] # [11] Generic dynamic event - add/remove kprobe 
events        [PASS]
23:49:57 DEBUG| [stdout] # [12] Generic dynamic event - add/remove synthetic 
events     [PASS]
23:49:57 DEBUG| [stdout] # [13] Generic dynamic event - selective clear 
(compatibility) [PASS]
23:49:58 DEBUG| [stdout] # [14] Generic dynamic event - generic clear event     
[PASS]
23:49:58 DEBUG| [stdout] # [15] Generic dynamic event - check if duplicate 
events are caught    [PASS]
23:49:58 DEBUG| [stdout] # [16] event tracing - enable/disable with event level 
files   [PASS]
23:49:58 DEBUG| [stdout] # [17] event tracing - restricts events based on pid 
notrace filtering [PASS]
23:49:59 DEBUG| [stdout] # [18] event tracing - restricts events based on pid   
[PASS]
23:49:59 DEBUG| [stdout] # [19] event tracing - enable/disable with subsystem 
level files       [PASS]
23:50:00 DEBUG| [stdout] # [20] event tracing - enable/disable with top level 
files     [PASS]
23:50:01 DEBUG| [stdout] # [21] Test trace_printk from module   [PASS]
23:50:04 DEBUG| [stdout] # [22] ftrace - function graph filters with stack 
tracer       [PASS]
23:50:05 DEBUG| [stdout] # [23] ftrace - function graph filters [PASS]
23:50:06 DEBUG| [stdout] # [24] ftrace - function pid notrace filters   [PASS]
23:50:06 DEBUG| [stdout] # [25] ftrace - function pid filters   [PASS]
23:50:08 DEBUG| [stdout] # [26] ftrace - stacktrace filter command      [PASS]
23:50:08 DEBUG| [stdout] # [27] ftrace - function trace with cpumask    [PASS]
23:50:12 DEBUG| [stdout] # [28] ftrace - test for function event triggers       
[PASS]
23:50:13 DEBUG| [stdout] # [29] ftrace - function trace on module       [PASS]
23:50:16 DEBUG| [stdout] # [30] ftrace - function profiling     [PASS]
23:50:21 DEBUG| [stdout] # [31] ftrace - function profiler with function 
tracing        [PASS]
23:50:22 DEBUG| [stdout] # [32] ftrace - test reading of set_ftrace_filter      
[FAIL]
23:50:24 DEBUG| [stdout] # [33] ftrace - test for function traceon/off triggers 
[PASS]
23:50:24 DEBUG| [stdout] # [34] ftrace - test tracing error log support [PASS]
23:50:28 DEBUG| [stdout] # [35] Test creation and deletion of trace instances 
while setting an event    [PASS]
23:50:29 DEBUG| [stdout] # [36] Test creation and deletion of trace instances   
[PASS]
23:50:30 DEBUG| [stdout] # [37] Kprobe dynamic event - adding and removing      
[PASS]
23:50:30 DEBUG| [stdout] # [38] Kprobe dynamic event - busy event check [PASS]
23:50:30 DEBUG| [stdout] # [39] Kprobe dynamic event with arguments     [PASS]
23:50:30 DEBUG| [stdout] # [40] Kprobe event with comm arguments        [PASS]
23:50:30 DEBUG| [stdout] # [41] Kprobe event string type argument       [PASS]
23:50:31 DEBUG| [stdout] # [42] Kprobe event symbol argument    [PASS]
23:50:32 DEBUG| [stdout] # [43] Kprobe event argument syntax    [PASS]
23:50:32 DEBUG| [stdout] # [44] Kprobes event arguments with types      [PASS]
23:50:32 DEBUG| [stdout] # [45] Kprobe event user-memory access [PASS]
23:50:33 DEBUG| [stdout] # [46] Kprobe event auto/manual naming [PASS]
23:50:33 DEBUG| [stdout] # [47] Kprobe dynamic event with function tracer       
[PASS]
23:50:34 DEBUG| [stdout] # [48] Create/delete multiprobe on kprobe event        
[PASS]
23:50:34 DEBUG| [stdout] # [49] Kprobe event parser error log check     [PASS]
23:50:35 DEBUG| [stdout] # [50] Kretprobe dynamic event with arguments  [PASS]
23:50:35 DEBUG| [stdout] # [51] Kretprobe dynamic event with maxactive  [PASS]
23:50:35 DEBUG| [stdout] # [52] Kretprobe %return suffix test   [PASS]
23:51:00 DEBUG| [stdout] # [53] Register/unregister many kprobe events  [PASS]
23:51:00 DEBUG| [stdout] # [54] Kprobe dynamic event - adding and removing      
[PASS]
23:51:01 DEBUG| [stdout] # [55] Uprobe event parser error log check     [PASS]
23:51:01 DEBUG| [stdout] # [56] test for the preemptirqsoff tracer      
[UNSUPPORTED]
23:51:32 DEBUG| [stdout] # [57] Meta-selftest: Checkbashisms    [PASS]
23:51:33 DEBUG| [stdout] # [58] Test wakeup tracer      [PASS]
23:51:35 DEBUG| [stdout] # [59] Test wakeup RT tracer   [PASS]
23:51:35 DEBUG| [stdout] # [60] event trigger - test inter-event histogram 
trigger expected fail actions        [XFAIL]
23:51:37 DEBUG| [stdout] # [61] event trigger - test field variable support     
[PASS]
23:51:38 DEBUG| [stdout] # [62] event trigger - test multiple actions on hist 
trigger   [PASS]
23:51:42 DEBUG| [stdout] # [63] event trigger - test inter-event histogram 
trigger onchange action      [PASS]
23:51:46 DEBUG| [stdout] # [64] event trigger - test inter-event histogram 
trigger onmatch action       [PASS]
23:51:51 DEBUG| [stdout] # [65] event trigger - test inter-event histogram 
trigger onmatch-onmax action [PASS]
23:51:53 DEBUG| [stdout] # [66] event trigger - test inter-event histogram 
trigger onmax action [PASS]
23:51:58 DEBUG| [stdout] # [67] event trigger - test inter-event histogram 
trigger snapshot action      [PASS]
23:51:58 DEBUG| [stdout] # [68] event trigger - test inter-event histogram 
trigger eprobe on synthetic event    [PASS]
23:52:02 DEBUG| [stdout] # [69] event trigger - test inter-event histogram 
trigger trace action with dynamic string param       [PASS]
23:52:03 DEBUG| [stdout] # [70] event trigger - test synthetic_events syntax 
parser     [PASS]
23:52:03 DEBUG| [stdout] # [71] event trigger - test synthetic_events syntax 
parser errors      [PASS]
23:52:07 DEBUG| [stdout] # [72] event trigger - test inter-event histogram 
trigger trace action [PASS]
23:52:08 DEBUG| [stdout] # [73] event trigger - test event enable/disable 
trigger       [PASS]
23:52:08 DEBUG| [stdout] # [74] event trigger - test trigger filter     [PASS]
23:52:09 DEBUG| [stdout] # [75] event trigger - test histogram modifiers        
[PASS]
23:52:09 DEBUG| [stdout] # [76] event trigger - test histogram parser errors    
[PASS]
23:52:09 DEBUG| [stdout] # [77] event trigger - test multiple histogram 
triggers        [PASS]
23:52:09 DEBUG| [stdout] # [78] event trigger - test snapshot-trigger   [PASS]
23:52:10 DEBUG| [stdout] # [79] event trigger - test stacktrace-trigger [PASS]
23:52:10 DEBUG| [stdout] # [80] trace_marker trigger - test snapshot trigger    
[PASS]
23:52:11 DEBUG| [stdout] # [81] trace_marker trigger - test histogram with 
synthetic event against kernel event [PASS]
23:52:12 DEBUG| [stdout] # [82] trace_marker trigger - test histogram with 
synthetic event      [PASS]
23:52:12 DEBUG| [stdout] # [83] event trigger - test traceon/off trigger        
[PASS]
23:52:15 DEBUG| [stdout] # [84] (instance)  Basic test for tracers      [PASS]
23:52:15 DEBUG| [stdout] # [85] (instance)  Basic trace clock test      [PASS]
23:52:15 DEBUG| [stdout] # [86] (instance)  Change the ringbuffer size  [PASS]
23:52:16 DEBUG| [stdout] # [87] (instance)  Snapshot and tracing setting        
[PASS]
23:52:16 DEBUG| [stdout] # [88] (instance)  trace_pipe and trace_marker [PASS]
23:52:16 DEBUG| [stdout] # [89] (instance)  event tracing - enable/disable with 
event level files       [PASS]
23:52:17 DEBUG| [stdout] # [90] (instance)  event tracing - restricts events 
based on pid notrace filtering     [PASS]
23:52:17 DEBUG| [stdout] # [91] (instance)  event tracing - restricts events 
based on pid       [PASS]
23:52:18 DEBUG| [stdout] # [92] (instance)  event tracing - enable/disable with 
subsystem level files   [PASS]
23:52:18 DEBUG| [stdout] # [93] (instance)  ftrace - function pid notrace 
filters       [PASS]
23:52:19 DEBUG| [stdout] # [94] (instance)  ftrace - function pid filters       
[PASS]
23:52:21 DEBUG| [stdout] # [95] (instance)  ftrace - stacktrace filter command  
[PASS]
23:52:24 DEBUG| [stdout] # [96] (instance)  ftrace - test for function event 
triggers   [PASS]
23:52:26 DEBUG| [stdout] # [97] (instance)  ftrace - test for function 
traceon/off triggers     [PASS]
23:52:26 DEBUG| [stdout] # [98] (instance)  event trigger - test event 
enable/disable trigger   [PASS]
23:52:27 DEBUG| [stdout] # [99] (instance)  event trigger - test trigger filter 
[PASS]
23:52:27 DEBUG| [stdout] # [100] (instance)  event trigger - test histogram 
modifiers   [PASS]
23:52:28 DEBUG| [stdout] # [101] (instance)  event trigger - test multiple 
histogram triggers   [PASS]
23:52:28 DEBUG| [stdout] # [102] (instance)  trace_marker trigger - test 
snapshot trigger       [PASS]
23:52:28 DEBUG| [stdout] # 
23:52:28 DEBUG| [stdout] # 
23:52:28 DEBUG| [stdout] # # of passed:  99
23:52:28 DEBUG| [stdout] # # of failed:  1
23:52:28 DEBUG| [stdout] # # of unresolved:  0
23:52:28 DEBUG| [stdout] # # of untested:  0
23:52:28 DEBUG| [stdout] # # of unsupported:  1
23:52:28 DEBUG| [stdout] # # of xfailed:  1
23:52:28 DEBUG| [stdout] # # of undefined(test bug):  0


Output from running test manually:

+ echo do_softirq
./ftracetest: 81: echo: echo: I/O error


# of passed:  0
# of failed:  1
# of unresolved:  0
# of untested:  0
# of unsupported:  0
# of xfailed:  0
# of undefined(test bug):  0

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 5.15 jammy realtime

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1959610

Title:
  ubuntu_kernel_selftests / ftrace:ftracetest do_softirq failure on
  Jammy realtime

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