From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1CPTUX-0007LQ-Tk for user-mode-linux-devel@lists.sourceforge.net; Wed, 03 Nov 2004 14:20:33 -0800 Received: from smtp001.mail.ukl.yahoo.com ([217.12.11.32]) by sc8-sf-mx1.sourceforge.net with smtp (Exim 4.41) id 1CPTUU-0003lT-L8 for user-mode-linux-devel@lists.sourceforge.net; Wed, 03 Nov 2004 14:20:33 -0800 From: Blaisorblade Subject: Re: [uml-devel] Re: Stop at startup on 2.6 NPTL hosts References: <20041029092641.8558.qmail@web26102.mail.ukl.yahoo.com> <200411031659.56887.blaisorblade_spam@yahoo.it> <20041103201001.GA29289@bytesex> In-Reply-To: <20041103201001.GA29289@bytesex> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200411032317.21886.blaisorblade_spam@yahoo.it> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Wed, 3 Nov 2004 23:17:21 +0100 To: user-mode-linux-devel@lists.sourceforge.net Cc: Gerd Knorr , LKML On Wednesday 03 November 2004 21:10, Gerd Knorr wrote: > On Wed, Nov 03, 2004 at 04:59:56PM +0100, Blaisorblade wrote: > > On Wednesday 03 November 2004 09:32, Gerd Knorr wrote: > > > Nuno Silva writes: > > > > Yes, maybe it was me and, FWIW, I never found a solution to make a > > > > dynamic skas uml run under 2.6+libcNTPL. > > > > > > The usual workaround for any nptl issues works here as well: > > > export LD_ASSUME_KERNEL=2.4.21 > > > > You mean 2.4.1 IIRC, right? > > The exact version doesn't really matter I think. More or less, it's true. The value is checked against 2.2.5 for base , 2.4.1 and 2.6.0 for using NPTL. On a RH 9, instead, IIRC 2.4.20 is the minimum for using NPTL. More details can be found at http://people.redhat.com/drepper/ (there is a LD_ASSUME_KERNEL link). > > However, that does not work on LinuxFromScratch and Gentoo systems, > > mostly, which miss a non-NPTL glibc version. > Yes, you need a non-nptl glibc version for that, otherwise the dynamic > linker can't use it obviously ... And this means that we must fix UML for NPTL. Also, the problem is strange: the child and the father, when created linking with NPTL, get the same pid, so os_stop_process (i.e. kill(SIGSTOP, child_pid)) kills the whole process. In fact, replacing those with gettid() and tkill() appears to fix the problem. But: 1) This should not happen, since clone() is not called with CLONE_THREAD (I verified that CLONE_THREAD is not used even with NPTL, so glibc is not doing anything strange here). 2) So, we get a host bug. 3) In fact, on my current Gentoo, Mplayer appears to experience a similar behaviour (it stops itself on entry and exit). It could be something unrelated, but it seems to me a host bug. Bye -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel