This does NOT occur on Noble. Trying it there, the following happens (note that I allowed debuginfod to be used but I'm not sure if that makes any difference):
``` (gdb) print strlen(statstr) 'strlen' has unknown return type; cast the call to its declared return type (gdb) print (size_t)strlen(statstr) $1 = 12 ``` However, attempting to use `print (size_t)strlen(statstr)` under Jammy still segfaults. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gdb in Ubuntu. https://bugs.launchpad.net/bugs/2061849 Title: Segmentation fault when calling standard library functions via `print` or `call` while debugging a `main()` function that accepts arguments Status in gdb package in Ubuntu: New Status in gdb source package in Jammy: New Bug description: Steps to reproduce: 1: Create a file `test.c` with the following very simple program: #include <stdio.h> /* for printf */ #include <string.h> /* for strlen */ int main(int argc, char **argv) { const char *statstr = "hello there!"; printf("%s\n", statstr); } 2: Save this file and compile it with `gcc -g test.c`. 3: Debug it with `gdb a.out`. 4: Run `b test.c:6` to set a breakpoint on the printf call. 5: Run `r` to start the program. 6: Run `print strlen(statstr)` to attempt to get the length of the statstr string. Expected result: The length of the string should be printed like so: `$1 = 12` Actual result: gdb segfaults. Segfault backtrace and info: ``` (gdb) print strlen(statstr) Fatal signal: Segmentation fault ----- Backtrace ----- 0x5ac45237f077 ??? 0x5ac452481859 ??? 0x5ac452481a22 ??? 0x72ec6204251f ??? ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0 0x5ac45232f020 ??? 0x5ac4524d6637 ??? 0x5ac45247f24a ??? 0x5ac45247b827 ??? 0x5ac45259e79f ??? 0x5ac45259ecef ??? 0x5ac4523b4654 ??? 0x5ac4526aa394 ??? 0x5ac4524829a4 ??? 0x5ac452482d43 ??? 0x5ac4524834c6 ??? 0x72ec633a7e0d ??? 0x5ac452481a95 ??? 0x5ac452483374 ??? 0x5ac45248168b ??? 0x5ac452833815 ??? 0x5ac452833caa ??? 0x5ac45253f36c ??? 0x5ac452541054 ??? 0x5ac4522d715f ??? 0x72ec62029d8f __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58 0x72ec62029e3f __libc_start_main_impl ../csu/libc-start.c:392 0x5ac4522dcbf4 ??? 0xffffffffffffffff ??? --------------------- A fatal error internal to GDB has been detected, further debugging is not possible. GDB will now terminate. This is a bug, please report it. For instructions, see: <https://www.gnu.org/software/gdb/bugs/>. Segmentation fault (core dumped) ``` Additional info: * You can create a function inside `test.c` that accepts a string as input and returns the result of running `strlen` on it. Calling that function via `print len(statstr)` does NOT segfault, but behaves as expected. * If you remove the `int argc, char **argv` from the `main()` function's argument list, calling `strlen(statstr)` in step 6 does NOT segfault, but behaves as expected. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: gdb 12.1-0ubuntu1~22.04 ProcVersionSignature: Ubuntu 6.5.0-25.25~22.04.1-generic 6.5.13 Uname: Linux 6.5.0-25-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Tue Apr 16 09:51:33 2024 InstallationDate: Installed on 2024-03-30 (17 days ago) InstallationMedia: Kubuntu 22.04.3 LTS "Jammy Jellyfish" (20231113) SourcePackage: gdb UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/2061849/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
