Details
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Bug
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Resolution: Incomplete
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Not Evaluated
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Qt Creator 3.5.1
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None
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Host PC
Host side cross-compiler: GCC 6.1.1 (Lenaro build)
QT: 5.1.1, QTCreator: 3.5.1
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ac2ceb36d76186aeb13022ef6ebc785bb454e2cf
Description
X11 forwarding over ssh is used. Remote debugging to an ARM host (Allwinner A33 quad core ARM running Ubuntu 16.04 root filesystem) is performed. If gdbserver is launched manually on the remote target & command line GDB is used to perform the debug session, the application would launch properly and displays the QT mainwindow on the host PC.
Remote target:
$ gdbserver :5555 DemoApp2 Process DemoApp2 created; pid = 4265 Listening on port 5555 Remote debugging from host 192.168.7.2 libEGL warning: DRI2: failed to authenticate Detaching from process 4272 QXcbConnection: XCB error: 1 (BadRequest), sequence: 380, resource id: 10485763, major code: 154 (Unknown), minor code: 1 QXcbShmImage: shmget() failed (38) for size 480000 (400x300)
Host side:
$ /opt/arm-linux-gnueabihf-v6.1.1/bin/arm-linux-gnueabihf-gdb DemoApp2 Reading symbols from DemoApp2...done. 0xb6fd7a40 in _start () from /opt/arm-linux-gnueabihf-rootfs/lib/ld-linux-armhf.so.3 (gdb) (gdb) continue Continuing. Cannot parse expression `.L966 4@r4'. warning: Probes-based dynamic linker interface failed. Reverting to original interface.
Contents of .gdbinit
set debug-file-directory /opt/arm-linux-gnueabihf-rootfs/usr/lib/debug set sysroot /opt/arm-linux-gnueabihf-rootfs target remote 192.168.7.1:5555
A kit was defined within QTCreator to perform the remote debugging.
Compilation works and launching the application from within QTCreator (run button) runs the application properly with the display exported over SSH using X11 forwarding. The application output is:
libEGL warning: DRI2: failed to authenticate QXcbConnection: XCB error: 1 (BadRequest), sequence: 380, resource id: 123731971, major code: 154 (Unknown), minor code: 1 QXcbShmImage: shmget() failed (38) for size 1536000 (800x480)
When debug is selected inside QTCreator, the debugger doesn't return from ' ui->setupUi(this);'. Pausing the application and inspecting the different threads, seems to point to a D-BUS problem. The code will not return from read():
Thread #1 DemoApp 0 read 1 _dbus_read 2 ?? Thread #2 QXcbEventReader 0 poll 1 ?? Thread #7 DemoApp 0 __libc_do_syscall 1 __libc_fork 2 ??
Application output in QTCreator
Debugging starts Listening on port 10000 Remote debugging from host 192.168.7.2 Process /opt/cellair/DemoAPp created; pid = 4300 Probes-based dynamic linker interface failed. Reverting to original interface. libEGL warning: DRI2: failed to authenticate
Note: No mention is now made of QXcbConnection: XCB error: 1 or QXcbShmImage: shmget() failed (38)
Note: Launching QTCreator over ssh from the remote target works properly, even though it is too slow to perform any productive development work. It compiles the project and debugging works properly. The application output is:
Debugging starts
Probes-based dynamic linker interface failed. Reverting to original interface. libEGL warning: DRI2: failed to authenticate QXcbConnection: XCB error: 1 (BadRequest), sequence: 380, resource id: 125829123, major code: 154 (Unknown), minor code: 1 QXcbShmImage: shmget() failed (38) for size 1536000 (800x480) Debugging has finished
Any help in this regard will be much appreciated
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