[Bug 2077601] [NEW] GDB 9.2 freezes when inspecting applications built by rustc

[Zixing Liu]

Public bug reported:

GDB 9.2 on Focal freezes when inspecting applications built by rustc.

Example program:

---
static mut B: bool = false;
static mut I: isize = -1;
static mut C: char = 'a';
static mut I8: i8 = 68;
static mut I16: i16 = -16;
static mut I32: i32 = -32;
static mut I64: i64 = -64;
static mut U: usize = 1;
static mut U8: u8 = 100;
static mut U16: u16 = 16;
static mut U32: u32 = 32;
static mut U64: u64 = 64;
static mut F32: f32 = 2.5;
static mut F64: f64 = 3.5;

fn main() {
    _zzz(); // #break

    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
}

fn _zzz() {()}
---

When built by Rust 1.79 using:

rustc-1.79 -Clto -g test1.rs -o test1

... and run using GDB and set a breakpoint on the //#break line, GDB
will freeze and consume 100% CPU on a single core.

The issue was fixed in GDB 11 in https://sourceware.org/git/?p=binutils-
gdb.git;a=commit;h=8457e5ecc45295bc9550c4f705a276d5ca90d908 but not
backported to GDB 9.x series.

** Affects: gdb (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2077601

Title:
  GDB 9.2 freezes when inspecting applications built by rustc

Status in gdb package in Ubuntu:
  New

Bug description:
  GDB 9.2 on Focal freezes when inspecting applications built by rustc.

  Example program:

  ---
  static mut B: bool = false;
  static mut I: isize = -1;
  static mut C: char = 'a';
  static mut I8: i8 = 68;
  static mut I16: i16 = -16;
  static mut I32: i32 = -32;
  static mut I64: i64 = -64;
  static mut U: usize = 1;
  static mut U8: u8 = 100;
  static mut U16: u16 = 16;
  static mut U32: u32 = 32;
  static mut U64: u64 = 64;
  static mut F32: f32 = 2.5;
  static mut F64: f64 = 3.5;

  fn main() {
      _zzz(); // #break

      let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
  }

  fn _zzz() {()}
  ---

  When built by Rust 1.79 using:

  rustc-1.79 -Clto -g test1.rs -o test1

  ... and run using GDB and set a breakpoint on the //#break line, GDB
  will freeze and consume 100% CPU on a single core.

  The issue was fixed in GDB 11 in
  https://sourceware.org/git/?p=binutils-
  gdb.git;a=commit;h=8457e5ecc45295bc9550c4f705a276d5ca90d908 but not
  backported to GDB 9.x series.

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