From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 68641 invoked by alias); 22 Mar 2016 16:15:26 -0000 Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org Received: (qmail 68623 invoked by uid 89); 22 Mar 2016 16:15:25 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 spammy=Hx-languages-length:960, execs, H*MI:sk:56F168D, registration X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Tue, 22 Mar 2016 16:15:15 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 0C4CBA756C; Tue, 22 Mar 2016 16:15:13 +0000 (UTC) Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2MGFBDs014531; Tue, 22 Mar 2016 12:15:12 -0400 Subject: Re: JIT debugging (Attach and speed) To: Yichao Yu , gdb@sourceware.org, Paul Pluzhnikov References: <56F168D7.9050405@redhat.com> From: Pedro Alves Message-ID: <56F16F8F.9050404@redhat.com> Date: Tue, 22 Mar 2016 16:15:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <56F168D7.9050405@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-SW-Source: 2016-03/txt/msg00026.txt.bz2 On 03/22/2016 03:46 PM, Pedro Alves wrote: >> 2. JIT code registration on attach is broken. >> >> When I set a breakpoint on `jit_inferior_init`[3] (i.e. lauching >> gdb with `gdb --args gdb -p `) which IIUC is what >> responsible for walking the jit object list at init time, it seems >> that the function is never called. >> >> (I haven't seen a bug report about this yet) > > Do you know whether this happens with 7.11 and master, and if so, > would it be possible for you to git bisect the culprit? Currently, jit_inferior_created_hook -> jit_inferior_init is only called when the inferior execs... Grepping around, I think that might have been the fix for PR gdb/13431 (03bef283c2d3): https://sourceware.org/ml/gdb-patches/2012-02/msg00023.html which removed the inferior_created (jit_inferior_created_observer). Adding an inferior_created observer back likely fixes the issue. Thanks, Pedro Alves