I install Win7 at my virtualbox, setup the guest end a standard "bcdedit"s. (debugtype=serial, port=1, baudrate=115200 /debug=on)
following steps took:
In the host end, I alloc a virtual serial port to the guest system
set the it with named-pipe "\.\pipe\debug".
I start Windbg to connect "\.\pipe\debug", I get "Could not open the pipe Win32 error 0n2"
After I power on the guest machine, I reopen Windbg, it works fine, but just saying "Opend \.\pipe\debug Waiting to reconnect...", It seems that no debugging data communicated with Guest Machine.
I try "bcdedit /bootdebug on", and reboot the machine. this time I see several output by Windbg during booting.
BD: Boot Debugger Initialized Connected to Windows Boot Debugger 7601
x64 target at (Sat Mar 17 17:28:46.559 2018 (UTC + 8:00)), ptr64 TRUE
Kernel Debugger connection established.
************* Path validation summary ************** Response Time (ms) Location Deferred
srvC:\Symbolshttp://msdl.microsoft.com/download/symbols Symbol
search path is:
srvC:\Symbolshttp://msdl.microsoft.com/download/symbols Executable
search path is: ReadVirtual() failed in GetXStateConfiguration()
first read attempt (error == 997. Windows Boot Debugger Kernel Version
7601 UP Free x64 Machine Name: Primary image base =
0x000000000052d000 Loaded module list = 0x00000000005df9e0 System
Uptime: not available Shutdown occurred at (Sat Mar 17 17:28:53.382
2018 (UTC + 8:00))...unloading all symbol tables.
It proves "\.\pipe\debug" is OK to transfer output of Guest VM's COM1.
When entering to login console, I see such message, and previous outputs turn to gray:
************* Path validation summary ************** Response Time (ms) Location Deferred
srvC:\Symbolshttp://msdl.microsoft.com/download/symbols Waiting to
reconnect...
I login and check the Device Manager, I can't find device COM1. but if I turn off /debug, I can.(Indeed, I used putty to check Guest'COM1 with Host's rawfile, I found it worked too, with the input of putty written to Host's file)
I tried many times with different COMs and baudrate, always got same outputs.
I tried a similar VMware Station, and got the same result.
Problem disappeared after I changed a Host machine and redid above steps.(:
Questions:
WHY can't I see the COM1 device with /debug on In the guest machine?
Does the Baudrate matters? (mismatch among Host's windbg setting, Guest's Device setting and Guest's debug setting), I tried to "Cycle BaudRate "In Windbg, it said Net COM port baud is ignored.
How to diagnose the problem?
_EDIT：
I found a similar post stuck on "reconnecting"
and this issue My Kernel Debugger Won’t Connect which refered there was a hot key "Ctrl+Alt+D" to show details of Windbg's I/O instead of a black-box. And it's normal and reasonable that COM1 disappear when "/debug=on" as the post said.
I could see the efforts windbg payed to sync the guest. After I pressed "ctrl+break", I saw windbg said "Send Sync", and still stuck... And, I would going to power off the guest by pressing "Host+Q". Miracle took place. Windbg came to alive and succeeded to break in.
I tried several times, with no failure. Now I can work happily... But WHY???
when I press "Ctrl+break", the windbg says
Send sync break
Send Break in ...
and stuck, and target machine is paused too. And I press "Host+Q" the "Esc" then it works.
install vbox in physical machine (the physical machine is Host henceforth)
install os inside vbox ( the os inside vbox is Target henceforth)
reboot Target and see if things go well a few times
open a elevated command prompt inside Target
since you have not created a Debug BootEntry create one first
run bcdedit /copy /? for syntax
to copy current bootentry to a new one you will be using
bcddedit /copy {current} /d "MyPipeDream"
{current} is alias for the current boot entry ID a GUID
MyPipeDream is a descriptive string
if you reboot now you should get two boot entries to choose from
choose the new bootentry to boot with so that you can operate with {current} well known ID instead of copy pasting or mistyping long unintuitive guids
assuming you booted MyPipeDream
you can check and enable debugging on the current id with
bcdedit /debug {current} on
you should reboot again to MyPipeDream which would be debug enabled now as in screen shots below
but before rebooting set the Serial Interface in vbox settings
also uncheck the connect to existing so that vbox creates the pipe
instead of trying to connect to an existing pipe
all setting on target are over now
on the host create a bat file with contents below and execute it
notice the pipename it is pipedream exactly matching the name we gave in vbox settings and not MyDreamPipe which is the ID descriptive string
start windbg -k com:port=\\.\pipe\pipedream,baud=115200,pipe,reconnect,resets=0
windbg should open up and say witing to reconnect
press ctrl+break a few times in the HOST WINDBG and vbox should connect to windbg or press ctrl+print screen in the TARGET
please see if you require Function keys (some wireless keyboards like logitech
needs ctrl+fn+pause / break key combos instead of plain ctrl+break
else open the Debug menu and select the Break in UI
org.openqa.selenium.SessionNotCreatedException: A new session could not be created. (Original error: An unknown server-side error occurred while processing the command. (Original error: unknown error: Device emulator-5554 is not online
This error can occur for serveral reasons as per given below-
Invalid app package name in testcase.
check usb debugging for device in enabled.
If you are using device then check connected as media/MTP/file transfer.
check you can see the device by suing adb devices command.
check the server is started with right port number.
if device is connected then set emulator false in code.
uninstall previous versions of app from the device.
if you share complete log we can diagnose the problem effectively.
Regards,
Anuja
An Eclipse RCP application crashes in the jprofilerti.dll code once I move the app from relatively idle status to full operation.
Some initial profile results are available back on the remote GUI session. This suggests that the configuration of Jprofiler GUI, Jprofiler agent, and network settings is ok.
I wonder if the crash occurs due to buffer overruns. I ask because the network link between the remote JVM and the near laptop JProfiler GUI is very poor with a very low effective bit rate. Is it possible that the target JVM will crash if the remote GUI is too slow about consuming buffered profiling data?
On my raspberry pi running raspbian (unix based i think) I get this error "job pending on /dev/sda1" every time that i plug in my USB flash drive. from my research it has something to do with mounting and un-mounting the device but I'm new to command line and most other posts are over my head. What do i do to fix this error?
if it matters i'm running a script on the pi that writes to that flash drive
Your desktop (LXDE for Raspberry Pi) has spotted that you have inserted a USB disc and has tried to mount it. You can enable or disable this behavior by editing the file ~/.config/pcmanfm/LXDE-pi/pcmanfm.conf and changing the line
mount_removable=1
to set '0' instead.
You would get that error if there were more than one thing trying to mount your USB disc at the same time. The second to run will notice that the first has already started a job to mount the disc.
Are you running two copies of your desktop GUI? (You may not realize that you are, but if you have a VNC or XRDP service you probably will be.)
If that is the cause of your problem (and probably in any event) the message is harmless. Something will have mounted your USB disc (perhaps you can even see it in /media?) The only infelicity will be that your desktop won't show you the results (e.g. by displaying the drive in a file manager.)
I have a video that I want to broadcast on a network using the http protocol.
I know libVLC can do that but I haven't been able to know how. I checked the doxygen documentation, but this hasn't helped me. Can you help me please ?
Thanks
Libvlc is the library to develop the application. vlc player is the client AND SERVER application to do that. If you just need to stream, use vlc media player as a server. You can find the command line / GUI steps if you google "vlc how to stream".
Basically in the file open dialog you get the option to configure either to load a stream from another source or local file OR RUN your own application as a streaming server.
The play button at the bottom of open dialog has a small button on the right to selec "stream" instead of play. But you need to have configured all options correctly to setup the type of stream you are looking for.
Lastly, you can run another instance of vlc as client to test your stream locally.