From: Blaisorblade <blaisorblade_spam@yahoo.it> To: user-mode-linux-devel@lists.sourceforge.net Cc: Gerd Knorr <kraxel@bytesex.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [uml-devel] Re: Stop at startup on 2.6 NPTL hosts Date: Wed, 3 Nov 2004 23:17:21 +0100 [thread overview] Message-ID: <200411032317.21886.blaisorblade_spam@yahoo.it> (raw) In-Reply-To: <20041103201001.GA29289@bytesex> 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 <nuno.silva@vgertech.com> 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
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From: Blaisorblade <blaisorblade_spam@yahoo.it> To: user-mode-linux-devel@lists.sourceforge.net Cc: Gerd Knorr <kraxel@bytesex.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [uml-devel] Re: Stop at startup on 2.6 NPTL hosts Date: Wed, 3 Nov 2004 23:17:21 +0100 [thread overview] Message-ID: <200411032317.21886.blaisorblade_spam@yahoo.it> (raw) In-Reply-To: <20041103201001.GA29289@bytesex> 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 <nuno.silva@vgertech.com> 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
next prev parent reply other threads:[~2004-11-03 22:28 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-10-29 9:26 [uml-devel] UML Kernel 2.6.7 Nothing happens Roland Kaeser 2004-11-02 18:52 ` Stop at startup on 2.6 NPTL hosts (was: Re: [uml-devel] UML Kernel 2.6.7 Nothing happens) Blaisorblade 2004-11-02 23:43 ` [uml-devel] Re: Stop at startup on 2.6 NPTL hosts Sven Köhler 2004-11-03 3:04 ` Nuno Silva 2004-11-03 8:32 ` Gerd Knorr 2004-11-03 15:59 ` Blaisorblade 2004-11-03 20:10 ` Gerd Knorr 2004-11-03 22:17 ` Blaisorblade [this message] 2004-11-03 22:17 ` Blaisorblade 2004-11-04 8:40 ` Nuno Silva 2004-11-09 16:42 ` Bodo Stroesser 2004-11-09 17:29 ` Adam Heath 2004-11-09 17:32 ` Bodo Stroesser 2004-11-09 18:23 ` Bodo Stroesser 2004-11-09 19:11 ` Blaisorblade 2004-11-10 8:36 ` stian 2004-11-10 9:07 ` Geert Uytterhoeven 2004-11-10 12:15 ` Bodo Stroesser 2004-11-10 12:47 ` Geert Uytterhoeven 2004-11-10 14:32 ` Blaisorblade 2004-11-10 14:44 ` Sven Köhler 2004-11-10 21:19 ` Henrik Nordstrom 2004-11-15 17:17 ` Blaisorblade 2004-11-10 17:16 ` Blaisorblade
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