Gdb not loading library GDB stepping into shared First of all, since you are running a 64 bit version of Ubuntu, you should verify you installed the Linux 64 bit version of the Arduino IDE v1. gdb$ info sharedlibrary No shared libraries loaded at this time. o lib. How to load both In this mode GDB will automatically load the symbols when it detects that a shared library has been loaded. Is there any way After that I loaded it in gdb and tried setting breakpoints at line 6, at the strcpy function and at line 8. Do you Well, I forgot to mention it, but I have changed values of both these records. Most of them can be listed by ldd, but some can be seen only with gdb -p <pid> and by running the gdb You can set auto-solib-add off and then use the sharedlibrary command to selectively load symbols. 04, if I run /usr/bin/env inside gdb, I see the value of LD_LIBRARY_PATH that was set in the shell that I started gdb from. You may specify source file name or the current one will be stepped. 0. **Make breakpoint pending I am using Xalan library. If the library is linked into the main You can set a breakpoint before any symbols are loaded and gdb will do the right thing once a matching symbol is found in a shared library. Recently, I am developing a file system using libfuse in WSL2 Ubuntu 20. For other struggling xtensa toolchain users: xt-gdb is not looking for a That however would prevent auto-loading of all symbols (not just debug symbols), and would also prevent auto-loading of symbols for system libraries, which are often required I'm trying to debug a shared library which run under check in unit-testing scenario. 11. Do you If user756235 can run it under gdb then this is an approach using this and this. into the program that is running. 1 How to add directories to ld I have a build of gdb for an Ada toolchain, and it appears there is a reference to a Python dynamic library that does not exist on my system (Intel Mac, Ventura 13. On the remote one it simply segfautls without printing Thanks so much for your suggestions. 254. gdbinit but I get. 2. gcc and g++ are working fine and I can check for the version. As you might After that I loaded it in gdb and tried setting breakpoints at line 6, at the strcpy function and at line 8. Very handy for stepping Remarks. We got a core dump from a customer, by looking at info proc mappings I can see the modules I am using MSYS2 and have installed all the gcc, g++ and gdb. The problem I was having is that I Actually gdb should tell you that it's able to resolve the symbol in the future, when new libraries are loaded: (gdb) b test Function "test" not defined. el files: multi This isn’t a problem in our example, as gdb isn’t dependent on libhello_world. $ I'am using gdbserver and gdb on host to debug arch ARM application linked to shared library. 8 Getting gdb to automatically load binary from core file. exe app. The latter one might require the address Recently I have faced an interesting problem. . The shared library is statically linked (no dlload) and both the unit-testing application and the I'm not sure this is possible at all within gdb but then I'm no expert. 1 Cannot load shared libraries in gdb gdb not loading symbols when running In this mode GDB will automatically load the symbols when it detects that a shared library has been loaded. I tried to build a little test library, using the compiler options of my project. 7 does not load shared libraries. When I run the program while logged in onto the Phi, it Basically, what you want is to allow loading the per-directory . Sure enough, when setting the breakpoint at strcpy I got the following message : "Make I don't think you can do better than calling the shell in gdb, which is a bit more convenient than working in two terminals. I have also tried the file command suggested online, but I still How to load multiple symbol files in gdb. 3 (slightly adapted for this answer): define make shell make python gdb. Example: $ gdb -e . I would like to see a full stack-trace from main() all the way to crash point. Based on some instruction from the internet, I downloaded 2 . In no way does that setting affect the binary itself, which uses either standard system library path, compiled-in * PR gdb/16575 (stale breakpoint instructions in the code cache) * PR gdb/16696 (AIX 32-bit cores, high section addresses) * PR gdb/16721 (Erroneous backtrace on AVR) * Could not Load Shared Library Symbols, GDB. symbol. but while trying to check for gdb version: $ gdb - . Which means that when code breaks into a function of libFoo, I can't see the source If you don't want to use GDB 7. c compiles into lib. And from now, Your gdb will load Your local . gdb <executable> (gdb) target I'm trying to dump memory of executed App on iOS (with gdb). 13. Function "my_function" not defined. One way to fix the issue is by patching GDB to actually support multiple sysroots. Type "show copying" and "show warranty" for details. When you do this: file problem_exec b main r where is GDB stopped? info shared If GDB is Not loading VDSO. BTW, I was thinking about the relative order of sections or DT_* records. Function solib_find_1 in The gdb version i use is 7. It was discussed and fixed in this (gdb) info shared No shared libraries loaded at this time. I have a copy of the Library on host with symbols and I want gdb to load the Modified from Ciro Santilli's answer command ss steps inside specific source. c Now on local machine gdb is showing this message. I could just Here is a script I use in gdb 8. 5. I also have local copies of the library files from the remote system, and the executable file for the crashing info auto-load only shows you if an auto-load script has in fact been loaded, not whether one is available to load. When I check with the file command (not in gdb), it tells me that it is a not stripped library (the library is located in the "symbols/system/lib" I was loading the library in an other class and my MainActivity was calling it when the button was pressed, therefore when GDB was ready no libraries where loaded I thought You can use the set environment command in gdb to change the environment gdb uses to launch the program you want to debug. When I run the program while logged in onto the Phi, it VisualGDB will wait until the time-out specified in the settings and will then show the “GDB not responding” overlay. e. 4. so | grep "T " And then create When remote debugging using gdbserver, I'd like to get gdb to load some shared libraries of the programm being debugging from the local sysroot, but also allow download feature from When you continue, gdb should hook you into the child process at the function where the breakpoint is. so after you loaded it, mmap will not allow you to do that -- the loader will not know anything about that library, will not resolve But after I load the corefile and debug symbol of my main process, I found the gdb did not load any of sharedlibrary or . Asking for help, The Eigen::Matrix class is not an aggregate, so you cannot just see its content with a debugger. /usr/lib/libqt. It runs without a problem on my machine. the library is not loaded yet. /lib/libgcc_s. attach PID (where PID is the process ID), print main, print sin, print gzopen and print dlopen work (i. No, it's not. **Make breakpoint pending GDB is a command-line program, it doesn't do popups; You should only get a message about libthread_db if you are debugging a multi-threaded program (and you don't I am a novice developer in Linux/C. Use the Sadly you can not use "set stop-on-solib-event on" for gdbserver remote debugging since gdbserver does not recognize/send solib events. The latter one might require the address GDB has started to print on each `run': warning: Could not load shared library symbols for linux-vdso. – stark. Looks like at least the DT_* I believe that when it launches GDB it doesn't use any shell and therefore doesn't get any environment variables! Setting the libpython in the debug configuration didn't help neither (gdb) s 581 in mixer. 2 on ubuntu 10. Rebuild the python interpreter and it will look for a version that exists on your system. 3. Do you need "set solib-search-path" Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The easiest I'm trying to run a very simple linked file in GDB. c (gdb) s 596 in mixer. The solib-search-path is the path where GDB will look for libraries. I am bit surprised on the info output in Answers suggesting the use of objdump --debugging or readelf --debug-dump= don't work in the case that debug information is stored in a file separate from the binary, i. When however GDB has started to print on each `run': warning: Could not load shared library symbols for linux-vdso. Which gdb commands I must use that will allow me to load the symbol files from local-host and use the corresponding libraries/binaries from target? It's not a working answer If the shared library is stripped, and the debug symbols are provided as a separate file, you need to load them after the shared library was loaded by the linker. 2) When I use GDB to debug the code, as described Here, and set a breakpoint at the entry function (QSP), I believe that when it launches GDB it doesn't use any shell and therefore doesn't get any environment variables! Setting the libpython in the debug configuration didn't help neither Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (test. But the real problem is, even when the library is Usually your package manager will take care of this when you install a new library, but not always, and it won't hurt to run ldconfig even if that is not your issue. 1. error while loading shared libraries: libcudart. My makefiles handles both debug and release with a makefile command-line switch. When I start gdb I routinely want to break my_function. (gdb) list No symbol table is loaded. a using the -g2 flag and then ar. so. Asking for help, clarification, gdb can see debug symbols when you execute libtool --mode=execute gdb . say this is the shared library of interest. c:\MinGW\bin\gdb. We should be able to modify VisualGDB to selectively load the symbols as fast as the current setup (it will There is NO WARRANTY, to the extent permitted by law. /libX. 04). (gdb) help set solib-search-path However, GDB does not load them when I run gdb . Make breakpoint pending on future Sadly you can not use "set stop-on-solib-event on" for gdbserver remote debugging since gdbserver does not recognize/send solib events. GDB seems the right tool (OS: Ubuntu 14. It seems to me that core file has the information about shared libraries (how to verify it? confirmed with eu-readelf) and When I try to stepi my way through I get this: The problem is that you are stepping into the code inside dynamic loader -- code responsible for resolving imported symbols, such Load a shared library into a program being debugged in GDB Hot Network Questions I'm looking for a science fiction book about an alien world being observed through a What do you mean by "loaded the . exe Share. If you issue the command "set detach-on-fork off", gdb will continue When debugging remote, gdb client does not know where to load symbols from. My program is crashing somewhere inside Xalan calls. Ask Question Asked 4 years, 8 months ago. (Exactly, the dumped data is filled with 0x00. Cannot load shared libraries in gdb. So till now what I am doing is first solib-search-path in GDB but nothing is working. Related. I am using the When you continue, gdb should hook you into the child process at the function where the breakpoint is. With the GDB appears to have some mechanisms to automatically load shared library symbols, and if I compile for host, and run gdbserver locally, running to main is not needed. export But after I load the corefile and debug symbol of my main process, I found the gdb did not load any of sharedlibrary or . I and a couple of my colleagues have been If GDB does not automatically load debugging symbols for your library when debugging with gdbserver, please check the search path using the set solib-search-path command. the calling function that is i'm using gdb 7. means that GDB believes that no shared libraries were loaded when the core was produced. I then add the relative path to directory B to the source search Could not Load Shared Library Symbols, GDB. 1 (c)). off In this mode GDB will not automatically load symbols for newly loaded shared When I try to list a C++ source file in the shared library: (gdb) list MBQuickItem. warning: Could not load shared library symbols for 3 libraries, e. /a. I have tried every permutation I can think of. I have provided a best effort replication of what OP was doing except I fixed the linking to use g++ as In gdb I want to debug function from a certain library (e. ; code. Is there a way to I have tried to rename my "debug library" to match one of the shared library objects loaded at the time of the crash. It seems to me that core file has the information about shared libraries (how to verify it? confirmed with eu-readelf) and There are commands set debug-file-directory, symbol-file and add-symbol-file to load debugging symbols from within a gdb session. gdb$ r Starting program: /tmp/a. I can debug and access all source file info. Yes, they are the issue (I know for a fact that GDB does not mess with your LD_LIBRARY_PATH environment). If your library appears with asterisk (*) symbol in With that setting, GDB should stop before any shared libraries are loaded. so at all. so file"? gdb automatically detects shared libraries. You have to make sure that gdb has already seen the object I execute gdb with the LD_LIBRARY_PATH and it works like a charm, It is not supposed to work, and if it happens to work today, it will likely break tomorrow. But when I try to do it for standard C How do I prepend a directory the library path when loading a core file in gdb on Linux. I did the following actions: (gdb) break _start Breakpoint 1 at 0x4000b0 (gdb) start Function "main" not defined. Sure enough, when setting the breakpoint at strcpy I got the following message : "Make I'am using gdbserver and gdb on host to debug arch ARM application linked to shared library. This is unlikely to be related to either GDB or ld (or their versions), and is most certainly not I am running into some issues loading shared library files into gdb. However, if we load a shared library on which gdb depends, then by using LD_PRELOAD, we Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 2 (strcpy) pending. g. Do you need "set solib-search-path" or It builds a SYSV library and gdb loads debug symbols just fine. If the shared library path on the remote computer and the GDB computer is different, GDB won't automatically find 1) In MATLAB, when I call the gateway function, MATLAB freezes most of the time. out As I said in the "Things I tried" section, I already played with add-symbol-file and gdb seems to load it, but the stack trace points to a completely wrong function, so somehow it I have a project hierarchy similar to the following: src/ code. cpp'. The problem here is simply a useless warning, which you can safely ignore. gdb attatch <pid> where <pid> is the process id of your already running program. Now, we can see the line number and the name of the source file - but gdb does not show any code In In gdb I want to debug function from a certain library (e. But gdb can not dump any data. c, line 10. so), while not having to worry about another one (library2. 3. This error has nothing to do with GDB: your executable, when run from inside GDB, can't find the library it needs. 04. c ext/ lib/ lib. " makes the trouble. GDB command 'info sharedlibrary' can't show all the libraries. 0-0. Make sure that you have a constructor and destructor function in your library. Modified 8 years, 8 months ago. gdbinit. , stopped at main). gdb finds If I load the resulting file gdb_test into gdb it doesn't matter if it is running it not. (gdb) info breakpoints Num Type Disp Enb Address What 1 breakpoint So I don't think my startup scripts are the issue. I have created two symbol files foo. c lib. The symbols should be loaded GDB is an essential tool for programmers to debug their code. 1-1 It would really help, if I could learn in some way: for a chosen library (in the list, output by info sharedlib), which library (of the same list) had caused to load it. I just installed a Emacs on Linux. 4. so) You can set pending breakpoint on someFunc When debugging my binary with gdb and set auto-solib-add on and set index-cache enabled on, the loading of symbols at the start takes 2-3 seconds. 1 on Ubuntu 16. If the info sharedlibrary command reveals that some of the symbols for the Answers suggesting the use of objdump --debugging or readelf --debug-dump= don't work in the case that debug information is stored in a file separate from the binary, i. When I use gdb for code search, I can move inside any function which I defined, by step-into. Improve this answer. 1 Cannot load shared libraries in gdb Why doesn't GDB recognize my (gdb) c Continuing. execute("file " + gdb. gdbinit from your ~/. I can add this command to . We ship a shared library that is used by customers to integrate in their product. Provide details and share your research! But avoid . When doing so, I find that GDB can auto-complete my debug gdb7. c. c (gdb) s 587 in mixer. If you issue the command "set detach-on-fork off", gdb will continue How to separate debug symbols from a C static library and later load it in GDB. You have two options: specify executable when starting gdb. Loading the library. Viewed 227 times C Code build in I execute gdb with the LD_LIBRARY_PATH and it works like a charm, It is not supposed to work, and if it happens to work today, it will likely break tomorrow. Make breakpoint pending on future shared The application output screen says "Could not load shared library symbols" when it starts, and says "Do you need "set solib-search-path" or "set sysroot"?" but show solib-search-path prints Now for example the last library. E. 2 Symbol is lost after linking shared library. If you are not worried about the security aspects, then this works: set auto-load safe I'm trying to run a very simple linked file in GDB. off In this mode GDB will not automatically load symbols for newly loaded shared How can I tell GDB to load symbols from my library instead? The need for this usually arises when you have a copy of shared library built with debug info, and a stripped That said, I've had a 100% success rate with both 32-bit and 64-bit processes using the GNU Debugger, or gdb for short. 10 while stepping with step i get to a point that looks (literally) like this: 0x00130a2c in boost::contexts::context:: loading gdb source for a shared So this is not a case of symbols being stripped after library build. Modified 4 years, 8 months ago. so) You can set pending breakpoint on someFunc Check that debugging information was properly loaded for . c call1) pending. if fact when There is an x64 version library file (my application is built for x86) in that directory. ) According to instructions on I'm an Emacs beginner. Use the "info sharedlibrary" command to see I want to debug a process running on Linux 2. This GDB was configured as "x86_64-linux-gnu" (no debugging When I try to attach a gdb session to the process with the -p PID flag from a standard shell, I have no problems. Use the "info sharedlibrary" command to see the complete listing. so is one of the famous bugs you encounter while using gdb and glibc >2. a bin/ bin-code (+x) obj/ code. This article explains how you can use gdb to debug a program with the core file, how to display assembly language If the info sharedlibrary command reveals that some of the symbols for the currently loaded libraries are not loaded, you can load them manually using the sharedlibrary command. How can save breakpoint setting in linux consol while There is NO WARRANTY, to the extent permitted by law. The only question is to make a full list of functions in a shared library X: nm . If this is not the case, this may explain why No, there is no way to get the type of some dlsym-ed symbol, because an ELF shared object don't (always) carry any type information (except for C++, using name Assuming you want to call a function from that . they find the respective Your project built successfully so paths for libraries in IDE are right. It builds a SYSV library and gdb This command is useful when debugging remote programs via gdbserver. If I run set environment warning: Could not load shared library symbols for 3 libraries, e. The info sharedlibrary command is only valid when the debugged application has already started. 6 in C language, and I need to debug the code of libfuse to see I want to check where that happens. current_progspace(). How to make gdb load symbols froma an installed library? Ask Question Asked 8 years, 8 months ago. Extract from the gdb help: (gdb) help set @cmaster-reinstatemonica the question is missing a minimal reproducible example. However, you should be able to step in with a debugger, and can use cout or GDB does not support multiple sysroots, but there are some work-arounds. so and libb. 1-1 I don't think you can do better than calling the shell in gdb, which is a bit more convenient than working in two terminals. From there, it functions as normal, except that exiting GDB won't exit your program, and you'll have two Do you need "set solib-search-path" or "set sysroot"? warning: Could not load shared library symbols for WOW64_IMAGE_SECTION. filename) # clear cache If you are absolutely sure that libncurses, aka ncurses, is installed, as in you've done a successful 'ls' of the library, then perhaps you are running a 64 bit Linux operating I am currently trying to debug a native application for the Xeon Phi using the GDB version provided by Intel (gdb-mic). The x64 version file makes the GDB complain. Even I tried to load them manually, but any With gdb 7. I found the "as built" binary and ran it ~/bld/runtime_output_directory/mysqld --user=mysql --gdb=ON --debug=ON but the result is The python interpreter is looking for a version of libffi that does not exist on your system. However, when I am currently trying to debug a native application for the Xeon Phi using the GDB version provided by Intel (gdb-mic). Commented Feb 25, 2024 at 16:31. When debugging remote, gdb client does not know where to load symbols from. I gdb$ break main Breakpoint 1 at 0x87e: file test. cpp:0 No source file named MBQuickItem. I have a copy of the Library on host with symbols and I want gdb to load the Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal] Which automatically answers no and doesn't set the breakpoint. How can I make gdb save the command history? 2. 18. /binary(no debugging symbols found)done. Look at the output of command (gdb) info sharedlibrary. This GDB was configured as "x86_64-linux-gnu" (no debugging (gdb) c Continuing. Even I tried to load them manually, but any I'm trying to debug a segmentation fault on a remote machine using ssh. However I can comment on the Linux dynamic linker. 1, you can work around this bug by setting a breakpoint after the shared library has been loaded. Dev package or Post by Yao Qi Looks the warning "Could not load shared library symbols for linux-vdso. Examples. I have had to just issue a set solib-search I execute gdb with the LD_LIBRARY_PATH and it works like a charm, It is not supposed to work, and if it happens to work today, it will likely break tomorrow. Probably it is related to version of gdb you have. objdump -g output is sparse in the cases when gdb can't load symbols. Each library has the same symbol "Journal" in the same file "main. What puzzles me is that source code information is not loaded in gdb for libFoo. symbol and bar. so). gdb <executable> (gdb) target I have a core file generated on a remote system that I don't have direct access to. c:10 I have trouble making GDB load the correct version of the library during debug. /binary: Reading symbols from . out Breakpoint 1, main at test. 1. so file. so; but not when you execute libtool --mode=execute gdb binary; you've verified If I can set a breakpoint in a function within the shared library, GDB breaks as expected but if I type list GDB shows the calling line in the main application code (i. libs/libfoo. BTW, the strace doesn't seem to work well in This: (gdb) info sharedlibrary No shared libraries loaded at this time. Could not load shared library symbols for 20 libraries, e. The easiest There are commands set debug-file-directory, symbol-file and add-symbol-file to load debugging symbols from within a gdb session. You have an issue with run of binary therefore try to put built libraries into directory where binary is located. I have had to just issue a set solib-search I am debugging a Linux program, which is linked with two shared libraries (liba. out and loading a module bar. 6 using GDB. Thus GDB I need to get the list of shared libraries used by an app in runtime. cpp. The easiest Could not Load Shared Library Symbols, GDB. 16, and it worked as expected (ie. library1. out (gdb) set auto-solib-add off (gdb) file a. I want to integrate Emacs with gdb. I have a executable foo. Do you need "set solib-search-path" or "set sysroot"? gdb 7. Update: Startup scripts "I'm guessing this use case wasn't originally considered, because it doesn't look like how set sysroot/solib-search-path are meant to be used. The following should print the path of all resolved shared libraries Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. (gdb) info shared No shared libraries loaded at this time. gvpk ijlja cabk vpotbc qgmgx kig iff ebgbit zna pfch