go-delve/delve · error

could not find hardware breakpoint for address %#x

Error message

could not find hardware breakpoint for address %#x

What it means

Error "could not find hardware breakpoint for address %#x" thrown in go-delve/delve.

Source

Thrown at pkg/proc/native/threads_linux_arm64.go:143

	var siginfo ptraceSiginfoArm64
	var err error
	t.dbp.execPtraceFunc(func() {
		_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETSIGINFO, uintptr(t.ID), 0, uintptr(unsafe.Pointer(&siginfo)), 0, 0)
	})
	if err != syscall.Errno(0) {
		return nil, err
	}
	if siginfo.signo != uint32(sys.SIGTRAP) || (siginfo.code&0xffff) != _TRAP_HWBKPT {
		return nil, nil
	}

	for _, bp := range t.dbp.Breakpoints().M {
		if bp.WatchType != 0 && siginfo.addr >= bp.Addr && siginfo.addr < bp.Addr+uint64(bp.WatchType.Size()) {
			return bp, nil
		}
	}

	return nil, fmt.Errorf("could not find hardware breakpoint for address %#x", siginfo.addr)
}

func (t *nativeThread) writeHardwareBreakpoint(addr uint64, wtype proc.WatchType, idx uint8) error {
	wpstate, err := t.getWatchpoints()
	if err != nil {
		return err
	}
	if idx >= wpstate.num {
		return errors.New("hardware breakpoints exhausted")
	}

	const (
		readBreakpoint  = 0x1
		writeBreakpoint = 0x2
		lenBitOffset    = 5
		typeBitOffset   = 3
		privBitOffset   = 1
	)

View on GitHub (pinned to a23773e6c3)

When it happens

Trigger: Thrown at pkg/proc/native/threads_linux_arm64.go:143 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of go-delve/delve@a23773e6c3 (2026-08-31). Data as JSON: /api/errors/87742f04a2371451. Report an issue: GitHub.