systemtap stapvirt tool

[Stan Cox]

I turned on:
  LIBVIRT_DEBUG=debug
which shows the deviation, indicated by "->".  The working case, stdin 
event followed by stream event is:

stapvirt: ##### stdin_event:1000 fd 0 events 0x1 stbuf_off 0 stbuf 
0x7fff259eecb8 termbuf_off 58 buf "file 926928 stap_b861775"
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virStreamEventUpdateCallback:1102 : stream=0x2013150, events=3
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virNetClientStreamEventTimerUpdate:86 : Check timer rx=(nil) cbEvents=3
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virNetClientStreamEventTimerUpdate:91 : Enabling event timer
   2022-07-07 17:20:55.565+0000: 353069: info : 
virEventGLibTimeoutUpdate:395 : EVENT_GLIB_UPDATE_TIMEOUT: timer=1 
interval=0
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virEventGLibTimeoutUpdate:406 : Update timeout data=0x2017e00 timer=1 
interval=0 ms
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virEventRunDefaultImpl:341 : running default event implementation
->2022-07-07 17:20:55.565+0000: 353069: debug : 
virEventGLibTimeoutDispatch:303 : Dispatch timeout data=0x2017e00 
cb=0x7fe5f98436a0 timer=1 opaque=0x200d170
   2022-07-07 17:20:55.565+0000: 353069: info : 
virEventGLibTimeoutDispatch:306 : EVENT_GLIB_DISPATCH_TIMEOUT: timer=1 
cb=0x7fe5f98436a0 opaque=0x200d170
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virNetClientStreamEventTimer:116 : Got Timer dispatch events=2 
cbEvents=3 rx=(nil)
stapvirt: ##### stream_event:1043 st 0x2013150 events 0x2 stbuf_off 0 
stbuf 0x7fff259eecb8

The case where stream event is not hit is:


stapvirt: ##### stdin_event:1000 fd 0 events 0x1 stbuf_off 0 stbuf 
0x7fff259eecb8 termbuf_off 1024 buf "^?ELF^B^A^A"
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virStreamEventUpdateCallback:1102 : stream=0x2013150, events=3
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virNetClientStreamEventTimerUpdate:86 : Check timer rx=(nil) cbEvents=3
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virNetClientStreamEventTimerUpdate:91 : Enabling event timer
   2022-07-07 17:20:55.565+0000: 353069: info : 
virEventGLibTimeoutUpdate:395 : EVENT_GLIB_UPDATE_TIMEOUT: timer=1 
interval=0
   2022-07-07 17:20:55.565+0000: 353069: debug : 
virEventGLibTimeoutUpdate:406 : Update timeout data=0x2017e00 timer=1 
interval=0 ms
   2022-07-07 17:20:55.566+0000: 353069: debug : 
virEventRunDefaultImpl:341 : running default event implementation
-> 2022-07-07 17:20:55.566+0000: 353069: debug : 
virEventGLibHandleDispatch:113 : Dispatch handler data=0x201e600 watch=2 
fd=0 events=1 opaque=0x7fff259ee8a0
   2022-07-07 17:20:55.566+0000: 353069: info : 
virEventGLibHandleDispatch:116 : EVENT_GLIB_DISPATCH_HANDLE: watch=2 
events=1 cb=0x4046e9 opaque=0x7fff259ee8a0
stapvirt: ##### stdin_event:975 fd 0 events 0x1 termbuf_off 1024 1024


Hits stream			Doesn't hit stream
...				...
virEventRunDefaultImpl:341	virEventRunDefaultImpl:341
				virEventGLibHandleDispatch:113
virEventGLibTimeoutDispatch:303
virEventGLibTimeoutDispatch:306
virNetClientStreamEventTimer:116
				virEventGLibHandleDispatch:116
stream_event			stdin_event

> What libvirt version are you testing with, and have you tried a differnt
> version ?

This is:
libvirt-8.1.0-2.fc36.x86_64
I have not tried another version but will give that a shot.