From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 134A23858D35; Sun, 14 Apr 2024 17:56:35 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 134A23858D35
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org;
	s=default; t=1713117396;
	bh=qbEGNVklN6kdHNQ4gqkIdYDw0eUz54hfZieb09Qo4C4=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=A6nLIEkxksreG1SEo8YQpW7z6vVmXI0MI3szEM8iWwEGpfStCAiEtF4VfdaUlLtkv
	 tIJCyNeIOD19tTqfPrNPRAb5BzKOGzx+D5zHEhPNWkbmjUUXrMLWzDh25LBeTxTi9j
	 ahqLHEoUxm29EHnh5cBrFSIMNy55gYuHLt0LgtfQ=
From: "brobecker at gnat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug testsuite/31312] attach-many-short-lived-threads gives
 inconsistent results
Date: Sun, 14 Apr 2024 17:56:34 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: testsuite
X-Bugzilla-Version: HEAD
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: brobecker at gnat dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: cel at linux dot ibm.com
X-Bugzilla-Target-Milestone: 15.1
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-31312-4717-oMGzrhrH4K@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-31312-4717@http.sourceware.org/bugzilla/>
References: <bug-31312-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gdb-prs.sourceware.org>

https://sourceware.org/bugzilla/show_bug.cgi?id=3D31312

--- Comment #25 from Joel Brobecker <brobecker at gnat dot com> ---
Hi Thiago,

Would you be able to share an update on this PR? As I understand it,
Pedro suggested an alternative approach:

I.e., in gdb, make attach_proc_task_lwp_callback return false/0 here:

      if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0)
        {
          int err =3D errno;

          /* Be quiet if we simply raced with the thread exiting.
             EPERM is returned if the thread's task still exists, and
             is marked as exited or zombie, as well as other
             conditions, so in that case, confirm the status in
             /proc/PID/status.  */
          if (err =3D=3D ESRCH
              || (err =3D=3D EPERM && linux_proc_pid_is_gone (lwpid)))
            {
              linux_nat_debug_printf
                ("Cannot attach to lwp %d: thread is gone (%d: %s)",
                 lwpid, err, safe_strerror (err));

              return 0;        <<<< NEW RETURN
            }

Have you had a chance to try that, by any chance?

Thank you!

--=20
You are receiving this mail because:
You are on the CC list for the bug.=