I have a test fix building here, could one of you verify it?
https://launchpad.net/~dannf/+archive/ubuntu/lp1848200
** Changed in: gdb (Ubuntu Bionic)
Status: New => In Progress
** Changed in: gdb (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1848200
Title:
gdb not stopping on breakpoint in a 32-bit program
Status in gdb package in Ubuntu:
Invalid
Status in gdb source package in Bionic:
In Progress
Status in gdb source package in Disco:
New
Status in gdb source package in Eoan:
Invalid
Status in gdb source package in Focal:
Invalid
Bug description:
After upgrading gdb from 8.1-0ubuntu3 to 8.1-0ubuntu3.1, gdb does not
stop on breakpoint when running a 32-bit application (on 64-bit
Ubuntu). This can be reproduced with a simple “hello world” program:
$ cat hello.c
#include <stdio.h>
int main()
{
// printf() displays the string inside quotation
printf("Hello, World!");
return 0;
}
$ gcc -ggdb -m32 hello.c
$ gdb a.out
(gdb) b hello.c:5
Breakpoint 1 at 0x536: file hello.c, line 5.
(gdb) run
Starting program: /home/user/sandbox/a.out
warning: Breakpoint address adjusted from 0xf7fd9be0 to 0xfffffffff7fd9be0.
warning: Breakpoint address adjusted from 0xf7fda195 to 0xfffffffff7fda195.
warning: Breakpoint address adjusted from 0xf7fdbd1c to 0xfffffffff7fdbd1c.
warning: Breakpoint address adjusted from 0xf7fdb924 to 0xfffffffff7fdb924.
warning: Breakpoint address adjusted from 0xf7fe99b3 to 0xfffffffff7fe99b3.
warning: Breakpoint address adjusted from 0xf7fea401 to 0xfffffffff7fea401.
warning: Breakpoint address adjusted from 0xf7fea706 to 0xfffffffff7fea706.
--- (and not stopping nor outputting the text…) ---
It works well with a 64-bit build (leaving out the gcc’s -m32 option).
This problem has been already discussed on:
https://stackoverflow.com/questions/58225562/how-to-fix-hang-in-gdb-
in-ld-linux-so-2-when-running-a-32-bit-executable-on-a-64
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdb 8.1-0ubuntu3.1
ProcVersionSignature: Ubuntu 4.15.0-65.74-generic 4.15.18
Uname: Linux 4.15.0-65-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Oct 15 14:37:37 2019
InstallationDate: Installed on 2015-12-08 (1407 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64
(20150805)
SourcePackage: gdb
UpgradeStatus: Upgraded to bionic on 2019-06-10 (127 days ago)
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