From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 796 invoked by alias); 9 Sep 2014 05:50:38 -0000 Mailing-List: contact gdb-prs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-prs-owner@sourceware.org Received: (qmail 606 invoked by uid 55); 9 Sep 2014 05:50:34 -0000 From: "cvs-commit at gcc dot gnu.org" To: gdb-prs@sourceware.org Subject: [Bug gdb/17247] gdb freezes on multi threaded app (test-case attached) Date: Tue, 09 Sep 2014 05:50:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gdb X-Bugzilla-Component: gdb X-Bugzilla-Version: 7.7 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: cvs-commit at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: xdje42 at gmail dot com X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-q3/txt/msg00422.txt.bz2 https://sourceware.org/bugzilla/show_bug.cgi?id=17247 --- Comment #39 from cvs-commit at gcc dot gnu.org --- This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "gdb and binutils". The branch, master has been updated via 92d8d229d9a310ebfcfc13bf4a75a286c1add1ac (commit) from 837405970476d31d6b4d7774e2c914fdfa7a9930 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=92d8d229d9a310ebfcfc13bf4a75a286c1add1ac commit 92d8d229d9a310ebfcfc13bf4a75a286c1add1ac Author: Doug Evans Date: Mon Sep 8 22:45:34 2014 -0700 Fix for PR 17247: Block SIGCHLD while initializing Guile. The problem here is that if a thread other than gdb's main thread gets a SIGCHLD (it's an asynchronous signal so the kernel will essentially pick a random thread) then gdb will hang if it is in sigsuspend when the SIGCHLD is delivered. The other thread will see the signal and the sigsuspend won't "wake up". Guile and libgc should be blocking SIGCHLD in their threads, but we need to work with Guile 2.0 and libgc 7.4. The problem first shows up in libgc 7.4 because it is the first release that enables multiple marker threads by default. gdb/ChangeLog: PR 17247 * guile.c: #include . (_initialize_guile): Block SIGCHLD while initializing Guile. Replaces the following, which is reverted. 2014-07-26 Doug Evans PR 17185 * configure.ac: Add check for header gc/gc.h. Add check for function setenv. * configure: Regenerate. * config.in: Regenerate. * guile/guile.c (_initialize_guile): Add workaround for libgc 7.4.0. ----------------------------------------------------------------------- Summary of changes: gdb/ChangeLog | 17 +++++++++++++ gdb/config.in | 6 ---- gdb/configure | 26 -------------------- gdb/configure.ac | 5 ---- gdb/guile/guile.c | 67 ++++++++++++++++++++++++++++------------------------ 5 files changed, 53 insertions(+), 68 deletions(-) -- You are receiving this mail because: You are on the CC list for the bug.