Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751383AbWI3SGG (ORCPT ); Sat, 30 Sep 2006 14:06:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751388AbWI3SGF (ORCPT ); Sat, 30 Sep 2006 14:06:05 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:6069 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S1751383AbWI3SGB (ORCPT ); Sat, 30 Sep 2006 14:06:01 -0400 Subject: Re: 2.6.18-rt1 From: Lee Revell To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , John Stultz , "Paul E. McKenney" , Dipankar Sarma , Arjan van de Ven In-Reply-To: <20060920141907.GA30765@elte.hu> References: <20060920141907.GA30765@elte.hu> Content-Type: text/plain Date: Sat, 30 Sep 2006 14:06:04 -0400 Message-Id: <1159639564.4067.43.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3426 Lines: 65 On Wed, 2006-09-20 at 16:19 +0200, Ingo Molnar wrote: > I'm pleased to announce the 2.6.18-rt1 tree, which can be downloaded > from the usual place: > > http://redhat.com/~mingo/realtime-preempt/ I got this Oops with -rt3, looks RCU related. Apologies in advance if it's already known. Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: [] __rcu_read_unlock+0x2e/0x82 PGD 46a3067 PUD 4e27067 PMD 0 Oops: 0002 [1] PREEMPT SMP CPU 1 Modules linked in: rfcomm hidp l2cap bluetooth nfsd exportfs lockd nfs_acl sunrpc powernow_k8 cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video button battery container ac asus_acpi dm_mod md_mod sr_mod sbp2 lp psmouse serio_raw sg evdev floppy parport_pc parport pcspkr i2c_nforce2 i2c_core shpchp pci_hotplug ext3 jbd mbcache ohci_hcd ehci_hcd ohci1394 ieee1394 forcedeth ide_generic ide_cd cdrom sd_mod sata_nv libata scsi_mod generic amd74xx ide_core thermal processor fan Pid: 21372, comm: fixdep Not tainted 2.6.18-rt3-smp-noipv6 #1 RIP: 0010:[] [] __rcu_read_unlock+0x2e/0x82 RSP: 0018:ffff8100045dbbf0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff810015a63070 RCX: 0000000000000246 RDX: 0000000000000000 RSI: ffff8100188bf007 RDI: ffff810015a63078 RBP: ffff810015a63070 R08: 0000000000000000 R09: ffff81001212d6c0 R10: ffff81001b9c0d48 R11: ffffffff8022ae94 R12: ffff810015a63078 R13: ffff8100119da4b0 R14: ffff8100045dbca8 R15: 0000000071bf92cd FS: 00002b7fb742d6d0(0000) GS:ffff81001b9178c0(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000000 CR3: 00000000194c3000 CR4: 00000000000006e0 Process fixdep (pid: 21372, threadinfo ffff8100045da000, task ffff81001622d800) Stack: ffffffff80208db8 0000000100000105 0000000700000001 ffff8100188bf000 00000000000041ed ffff8100045dbea8 ffff8100119f5180 ffff810001232480 ffff8100045dbea8 ffff8100045dbca8 ffffffff8020c353 ffff81001b9c0d00 Call Trace: [] __d_lookup+0x10b/0x11d [] do_lookup+0x2a/0x173 [] __link_path_walk+0x3af/0xf5c [] file_read_actor+0x0/0xce [] _atomic_dec_and_spin_lock+0x2b/0x33 [] link_path_walk+0x5c/0xe5 [] _atomic_dec_and_spin_lock+0x14/0x33 [] get_unused_fd+0xf9/0x107 [] filemap_nopage+0x1cb/0x39b [] do_path_lookup+0x26c/0x290 [] __rt_rwlock_init+0x9/0x12 [] __path_lookup_intent_open+0x56/0x97 [] open_namei+0x6d/0x6a4 [] free_pgtables+0xe6/0x172 [] __cache_free+0x51/0x1f2 [] do_filp_open+0x1c/0x3d [] _atomic_dec_and_spin_lock+0x14/0x33 [] get_unused_fd+0xf9/0x107 [] do_sys_open+0x44/0xc5 [] system_call+0x7e/0x83 Code: f0 ff 08 65 48 8b 04 25 00 00 00 00 48 c7 80 a8 00 00 00 00 RIP [] __rcu_read_unlock+0x2e/0x82 RSP CR2: 0000000000000000 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/