Gdb No Stack Error
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Gdb Backtrace Line Number
Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Line number gdb line number from address of segmentation fault up vote 30 down vote favorite 9 Is there any gcc option I can set that will give me the line number of the segmentation fault? I know I can: Debug line by line Put printfs in the code to gdb show line number narrow down. Edits: bt / where on gdb give No stack. Helpful suggestion debugging gcc gdb segmentation-fault share|improve this question edited Oct 6 '13 at 23:52 Kamil Slowikowski 184110 asked Feb 2 '09 at 23:41 Rohit 92241527 can you post your compiler flags? –cbrulak Feb 2 '09 at 23:55 gcc -DDEBUG -I"" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP –Rohit Feb 3 '09 at 0:00 (next time, put your code in your question please). –cbrulak Feb 3 '09 at 0:03
Gdb Not Showing Line Number
5 I tried too but not all of its my code and actually, finding the relevant part of the code is my problem. –Rohit Feb 3 '09 at 0:04 add a comment| 8 Answers 8 active oldest votes up vote 39 down vote accepted I don't know of a gcc option, but you should be able to run the application with gdb and then when it crashes, type where to take a look at the stack when it exited, which should get you close. $ gdb blah (gdb) run (gdb) where Edit for completeness: You should also make sure to build the application with debug flags on using the -g gcc option to include line numbers in the executable. Another option is to use the bt (backtrace) command. share|improve this answer edited Feb 14 '13 at 21:08 Drew Noakes 128k73394489 answered Feb 2 '09 at 23:46 rck 1,09521420 1 What do I do if where shows "No stack" ? –Rohit Feb 3 '09 at 0:02 Some crashes can corrupt stact contents and then you're probably best with inserting printf's and checking validity of input at various code points. –che Feb 3 '09 at 0:07 2 you could also try my suggestion below -- it uses glibc's stack unwind routines to print you out a stacktrace w/o having to resort to gdb. –tgamblin Feb 3 '09 at 0:24 add a comment| up vote 17 down vote Here's a complete shell/gdb session $ gcc -ggdb myproj.c $ gdb a.out gdb> run --some-o
its caller (frame one), and on up the stack. backtracebtPrint a backtrace of the entire stack: one line per frame for all frames in the stack. You can stop the backtrace at any time by gdb backtrace no symbol table info available typing the system interrupt character, normally Ctrl-c. backtrace nbt nSimilar, but print only the how to debug segmentation fault in linux innermost n frames. backtrace -nbt -nSimilar, but print only the outermost n frames. backtrace fullbt fullbt full nbt full -nPrint the
Gdb Backtrace Example
values of the local variables also. As described above, n specifies the number of frames to print. backtrace no-filtersbt no-filtersbt no-filters nbt no-filters -nbt no-filters fullbt no-filters full nbt no-filters full -nDo not run Python http://stackoverflow.com/questions/505465/line-number-of-segmentation-fault frame filters on this backtrace. See Frame Filter API, for more information. Additionally use disable frame-filter all to turn off all frame filters. This is only relevant when gdb has been configured with Python support. The names where and info stack (abbreviated info s) are additional aliases for backtrace. In a multi-threaded program, gdb by default shows the backtrace only for the current thread. To display the backtrace for several https://sourceware.org/gdb/onlinedocs/gdb/Backtrace.html or all of the threads, use the command thread apply (see thread apply). For example, if you type thread apply all backtrace, gdb will display the backtrace for all the threads; this is handy when you debug a core dump of a multi-threaded program. Each line in the backtrace shows the frame number and the function name. The program counter value is also shown—unless you use set print address off. The backtrace also shows the source file name and line number, as well as the arguments to the function. The program counter value is omitted if it is at the beginning of the code for that line number. Here is an example of a backtrace. It was made with the command ‘bt 3’, so it shows the innermost three frames. #0 m4_traceon (obs=0x24eb0, argc=1, argv=0x2b8c8) at builtin.c:993 #1 0x6e38 in expand_macro (sym=0x2b600, data=...) at macro.c:242 #2 0x6840 in expand_token (obs=0x0, t=177664, td=0xf7fffb08) at macro.c:71 (More stack frames follow...) The display for frame zero does not begin with a program counter value, indicating that your program has stopped at the beginning of the code for line 993 of builtin.c. The value of parameter data in frame 1 has been replaced by .... By default, gdb prints the value of a para
Format For Printing -XML -Clone This Bug -Last Comment First Last Prev Next This bug is not in https://bugzilla.redhat.com/show_bug.cgi?id=1055186 your last search results. Bug1055186 - GDB: bracktrace gives "No stack" on trivial test program Summary: GDB: bracktrace gives "No stack" on trivial test program Status: CLOSED NOTABUG Aliases: None Product: http://wiki.freepascal.org/Creating_a_Backtrace_with_GDB Fedora Classification: Fedora Component: gdb (Show other bugs) Sub Component: --- Version: 19 Hardware: x86_64 Linux Priority unspecified Severity urgent TargetMilestone: --- TargetRelease: --- Assigned To: Jan Kratochvil QA Contact: Fedora line number Extras Quality Assurance Docs Contact: URL: Whiteboard: Keywords: Depends On: Blocks: Show dependency tree /graph Reported: 2014-01-19 08:24 EST by Jascha Wetzel Modified: 2014-01-19 08:33 EST (History) CC List: 7 users (show) gbenson jan.kratochvil jascha palves pmuldoon sergiodj tromey See Also: Fixed In Version: Doc Type: Bug Fix Doc Text: Story Points: --- Clone Of: Environment: Last Closed: 2014-01-19 gdb no stack 08:33:37 EST Type: Bug Regression: --- Mount Type: --- Documentation: --- CRM: Verified Versions: Category: --- oVirt Team: --- RHEL 7.3 requirements from Atomic Host: Cloudforms Team: --- Attachments (Terms of Use) Add an attachment (proposed patch, testcase, etc.) Groups: None (edit) Description Jascha Wetzel 2014-01-19 08:24:49 EST GDB debugging seems broken in current F19. [jascha@localhost ~]$ yum list installed | grep gcc gcc.x86_64 4.8.2-7.fc19 @updates gcc-c++.x86_64 4.8.2-7.fc19 @updates libgcc.i686 4.8.2-7.fc19 @updates libgcc.x86_64 4.8.2-7.fc19 @updates [jascha@localhost ~]$ yum list installed | grep gdb gdb.x86_64 7.6.1-46.fc19 @updates gdbm.x86_64 1.10-6.fc19 @anaconda [jascha@localhost ~]$ cat bt_test.c int main() { int* p = 0; return *p; } [jascha@localhost ~]$ gcc -g -o bt_test bt_test.c [jascha@localhost ~]$ gdb bt_test GNU gdb (GDB) Fedora 7.6.1-46.fc19 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later
1 Reasons to create a backtrace 1.1 Bug Reports 1.2 Help yourself find a problem 1.3 Just plain fun!! 2 Creating a Backtrace 2.1 Very short how-to 2.2 Directly from the Call Stack window 2.3 Windows Users 2.4 Linux/BSD Users 2.5 Mac OS X 2.5.1 Mac OS X: Graphical application 2.5.2 Mac OS X: Non graphical application, command line program 2.6 GDB ready to accept commands 3 Getting the Backtrace out of the terminal and into an email 4 Understanding a Backtrace Reasons to create a backtrace Bug Reports Backtraces can be very helpful when submitting bug reports. They will no doubt increase the chances of the bug getting fixed sooner. Help yourself find a problem A backtrace can really take the pain out of finding a problem with your own program. Often exposing the problem immediately. Just plain fun!! Okay this might be a stretch, but making backtraces is just plain fun! Seriously though, if you can think of another reason to create a backtrace add it here. Creating a Backtrace To create a backtrace with GDB (Gnu DeBugger): You must have the program GDB. It is available on most *nix installations. If you downloaded the Windows version of fpc or Lazarus, GDB is already included in the installation. In Lazarus it is set up as the default debugger. Look in Tools -> Options -> Debugger -> General Tab. Default path for GDB on Windows is c:\lazarus\mingw\bin\gdb.exe. GDB must be in the PATH environment variable. If it's not under windows, from the command prompt type (example): set PATH=%PATH%;c:\lazarus\mingw\bin\ The program you wish to debug MUST have debugging info included in the executable. If you have used "strip", "upx", compiled with "Xs" or used some other exe shrinker/compressor this won't work! Very short how-to Linux terminal: $ cd program_folder $ gdb program_name run Then AV happens. Type: bt Directly from the Call Stack window To capture a Backtrace from within Lazarus, make sure you compile the program including both options "Generate debug info for GDB" and "Display line numbers in run-time error backtraces (-gl)" and you have properly setup GDB in Debugger Options. Run your application until the problem appear If a dialog should appear alerting about a problem showing a couple of buttons: "Break" and "Continue", click the "Break" button. Open the Call Stack window (Menu View->Debug Windows->Call Stack Look a the list of Calls, if necessary press "(+)More" Press the "Cop