Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 11 Feb 2001 15:17:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 11 Feb 2001 15:17:21 -0500 Received: from ns.suse.de ([213.95.15.193]:43788 "HELO Cantor.suse.de") by vger.kernel.org with SMTP id ; Sun, 11 Feb 2001 15:17:10 -0500 Date: Sun, 11 Feb 2001 21:17:01 +0100 From: Olaf Hering To: autofs@linux.kernel.org Cc: linux-kernel@vger.kernel.org Subject: race in autofs / nfs Message-ID: <20010211211701.A7592@suse.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="k+w/mQv8wyuph6w0" Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --k+w/mQv8wyuph6w0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, there is a race in 2.4.1 and 2.4.2-pre3 in autofs/nfs. When the cwd is on the nfs mounted server (== busy) and you try to reboot the shutdown hangs in "rcautofs stop". I can reproduce it everytime. I attach a screen log and a decoded sysrq output. It is not related to that killproc, it hangs right now in automount <-> kupdate (with kernel 2.4.1): kupdate 6 0 0 -1 ?00000000 c307a000 0 current automoun 1525 31480 503680 54 u0176a368 df3e6000 1 current there is a spinlock message: _spin_lock(c021f6e4) CPU#1 NIP c01b8220 holder: cpu 1 pc E126BF28 c021f6e4 is not in the System.map, but c01b8220 is c01b817c T memparse c01b8200 T atomic_dec_and_lock c01b9a5c t cleanup_proc_rtas The attached log is kernel 2.4.2-pre3. killproc 1701 1030738 16491808 106 u0178d5c8 c7de6000 0 current automoun 1705 1036120 16577920 54 u0176a368 c7b46000 1 current _spin_lock(c022279c) CPU#1 NIP c01b7c5c holder: cpu 1 pc E126BF28 SysRq: Emergency Sync _spin_lock(c022279c) CPU#0 NIP c005d920 holder: cpu 1 pc E126BF28 _spin_lock(c022279c) CPU#1 NIP c01b7c5c holder: cpu 1 pc E126BF28 c01b7c5c is again atomic_dec_and_lock and c005d920 is d_lookup. The system is a 2way RS/6000, 2gig ram. Linux cantaloupe 2.4.1-SMP #1 SMP Sun Feb 11 13:02:05 GMT 2001 ppc unknown Kernel modules 2.4.1 Gnu C 2.95.2 Gnu Make 3.79.1 Binutils 2.10.0.33 Linux C Library x 1 root root 1499361 Feb 9 02:50 /lib/libc.so.6 Dynamic linker ldd (GNU libc) 2.2 Procps 2.0.7 Mount 2.10q Net-tools 1.57 Kbd 1.02 Sh-utils 2.0 Modules Loaded nfsd autofs4 ipv6 Any ideas what could be wrong? Gruss Olaf -- $ man clone BUGS Main feature not yet implemented... --k+w/mQv8wyuph6w0 Content-Type: application/x-gunzip Content-Disposition: attachment; filename="screenlog.0.crash.gz" Content-Transfer-Encoding: base64 H4sICJTuhjoAA3NjcmVlbmxvZy4wLmNyYXNoANRb63PiSJL/rr8idzYuBi4M6MFDMOeJsQG3 uW5sDtw9PefYIIRUAi1C0uhhm/6wf/v9siTx8GvomI2NWz5gUcqszMp3VpXt2EpWc73erOu1 KBZGzcrS0E1qsWULRRFBKmIvWNJaxIHw6/W64gVJagWpZ6U8HqdWQlZKqtpW+UMAIScMhAKo WILYUUYNfCWNSfgo4kn/bHL763Bq/KIDNlwrYSQChnO8JPKtLTUi2/vFFULO1yhGf1nwxIC2 w2jL0LdX5IgHzxaUxkLgpSQ6Cjxw5nvfGMS11oISG6+DXjm7Eos0iyU9VWvmLJMbhxuK8DX3 gK/chanl00ZswnhL56SrTXN8+RNlCWPxr/UluWFMK0iOUmvhC6pABLZqyvmqyicvyJ7oQcSJ FwZ0INvQt1yqxGGY/mJDhpYfZpGoUmVp2wfg3VZdJ63b7Wqq3gS48IWViGqV/mrQbDyhGYhd iQVpKulGT1V7LZP6wzuwpmrKpD+iRZaQSnYYpHHo+8KhxZYgVNaTK1zJpOIl1twL5wvMfO7m jKsKgOZY9zx03USk56pcZrryElrEnrMUEosBJJrtFmglzXbzLaLixPlvYQuTUZ8sx4mTHrmu nasIbLsdWz4I+aBM7y5mNHyAgdIMsqSplYoeaVTRITj6u+e6nkiqym1AQegIiCNlrUbWUmDe 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