You Need To Get Rid Of Cygwin Debug Stackdump Problems

 

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    During the past days, some users have encountered an error while working with the cygwin debug dump. Several factors can cause this problem. Now let’s talk about some of them.

     

     

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  • First: you must compile your program by passing the gcc flag -ggdb ,otherwise, the corresponding stack dump information is unnecessary. Also suggest skipping the search for -O0 to make it easier to debug with gdb as the promo code will not be optimized.

    Second: all stack dumps return addresses that are on that stack,in the example on the 32-bit version, each has two addresses:

      $ cat t-invmod.exe.stackdumpLot tracking:The args skeleton function0028C878 61032BCB (000000F4, 0000EA60, 000000A4, 0028C8D8)0028C998 610E7A7A (00000001, 0028CA3F, 00000001, 611A2C80) 

    The address can be obtained from your programs or loaded libraries in use.

      $ addr2line.exe -a 610E7A7A -a 61032BCB -e /usr/bin/cygwin1.dll0x610e7a7a/usr/src/debug/cygwin-2.5.1-1/winsup/cygwin/cygerrno.h:360x61032bcb/usr/src/debug/cygwin-2.5.1-1/winsup/cygwin/cygerrno.h:35 

    In this case, the entire top address told me that the failure occurred in the provided library and not in the program. Can you use ldd to determine which addresses belong to:

      $ ldd t-invmod.exe        ntdll.dll => /cygdrive/c/Windows/SysWOW64/ntdll.dll (0x776d0000)        kernel32.dll => /cygdrive/c/Windows/syswow64/kernel32.dll (0x75500000)        KERNELBASE.dll => /cygdrive/c/Windows/syswow64/KERNELBASE.dll (0x75a10000)        SYSFER.DLL => /cygdrive/c/Windows/SysWOW64/SYSFER.DLL (0x73480000)cygflint.dll => /usr/bin/cygflint.dll (0x5f390000)        cygwin1.dll => /usr/bin/cygwin1.dll (0x61000000)        cyggmp-10.dll => /usr/bin/cyggmp-10.dll (0x589e0000)        cygmpfr-4.dll => /usr/bin/cygmpfr-4.dll (0x51080000)        cyggcc_s-1.dll => /usr/bin/cyggcc_s-1.dll (0x5ece0000)        cygntl-9.dll => /usr/bin/cygntl-9.dll (0x50270000)        cygstdc ++ - 6.dll => /usr/bin/cygstdc++-6.dll (0x4b340000) 

    If the address is less than dll, it belongs to your current program; If it is part of a library, you will need to install the * relative debuginfo package to restore all localization information.

    When a human program does not work as expected, this tool usually contains a “bug”.there is a presentation, something is wrong with the preparation itself, that islead to unexpected results or even failure. Diagnose these errors, people andAttachment is called by exclusive toolsDebugger. Cygwin operator, debuggerit’s GDB, which stands for GNU DeBugger. A tool with which you can create yourProgram in a controlled environment where you can also useThe state of your program, even if it is running or after a crash.Faulty programs sometimes create “kernel” files. In Cygwin it isregular text message files ii that GDB cannot use directly

    Before you can debug your personal program, you must haveDebug program. What you need to do is add -g for other flags that you will use when compiling sources.You are to objects.

    This absolutely definitely adds additional information to specific objects (they gettoo much) more, which often informs the debugger of line evaluations, the variableNames and other useful things. Debug these extra symbolsInformation and creation of your program is enough information about its originalSources, so the debugger often makes it easier to debug foryou.

    To create a GDB, just type gdb myapp.exe intoCommand line. A lot of text is displayed to tell you about everything around youthen (gdb) appears which asks for a writeOrders. Whenever you like this prompt, it means that GDB is waiting forso that you can enter the found command, for example run orTo help. Oops, :-) printHelp get service for orders for which you can use versions, orRead the [GDB User Guide] forDescription of the GBB during its use.

    cygwin debug stackdump

    When your preparation collapses and you try to imagine itcrashed why is it the best race initially and so let goYour program is running. After this situation gets stuck, you can typewhere to think about where it crashed, orInformation on local residences to see the values ​​of most residentsVariables. There is also a trustworthy imprint that allows you to seefor individual variables or from the position of pointers.

    If your program is doing something dangerous, you canbreak Use a command to tell GDB to stop your software package when itreaches a specific job or line number:

    cygwin debug stackdump

    If you run now naturally, your program will stopwhere experts state a “breakpoint” and you can use other gdb commands for authe state of your program in which you are modifying variables, andFollow the program instructions step by stepTime.

    Pay attentionthat you can provide many additional arguments forRun apologize command on command line forYour program. These two pockets are equal simply because your programaffected:

    bash $ gcc -g -O2 -c myapp.c bash $ gcc -g myapp.c -a myappInterrupt (gdb) my_function (gdb) pause 47 bash $ myprog -t foo –queue 47 bash $ gdb myprog (gdb) put -t foo –queue 47

     

     

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