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From: "peter0x44 at disroot dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/31194] New: Stepping on "int3" instruction fails assertion.
Date: Wed, 27 Dec 2023 22:54:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31194

            Bug ID: 31194
           Summary: Stepping on "int3" instruction fails assertion.
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: peter0x44 at disroot dot org
  Target Milestone: ---

I tested this with:
GNU gdb (GDB) 15.0.50.20231227-git

But I could also reproduce it with gdb 13.1, and gdb 13.2

For the following code:

#include <stdio.h>

int main(void)
{
        __asm__("int3");
        for (int i =3D 0; i < 5; ++i)
        {
                printf("%d\n", i);
        }
}

Compiled with:
gcc test.c -o test -O2 -g3

GCC does lack an intrinsic to generate the "int3" instruction, but clang
generates it from __builtin_debugbreak().

When I run, the debugger breaks as expected, but as soon as I step, the
following happens:
../../gdb/infrun.c:2973: internal-error: resume_1: Assertion
`pc_in_thread_step_range (pc, tp)' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

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