From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: null dereference in nfs4_begin_drain_session Date: Tue, 15 Dec 2009 17:24:49 -0500 Message-ID: <20091215222449.GD8686@fieldses.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-nfs@vger.kernel.org To: Trond Myklebust Return-path: Received: from fieldses.org ([174.143.236.118]:39875 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761385AbZLOWYq (ORCPT ); Tue, 15 Dec 2009 17:24:46 -0500 Sender: linux-nfs-owner@vger.kernel.org List-ID: I got this just now on a test client running a branch including (among other stuff) your 72211dbe727f7c1451aa5adfcbd1197b090eb276. Looks like it was trying to run cthon tests over v4.0. Anything known? Let me know if you want anything more. --b. BUG: unable to handle kernel NULL pointer dereference at 00000088 IP: [] __lock_acquire+0x21b/0x1880 *pde = 00000000 Oops: 0000 [#1] PREEMPT last sysfs file: /sys/kernel/uevent_seqnum Modules linked in: Pid: 3137, comm: 192.168.122.129 Not tainted 2.6.32-07559-g0adf9c1 #553 / EIP: 0060:[] EFLAGS: 00010046 CPU: 0 EIP is at __lock_acquire+0x21b/0x1880 EAX: 00000084 EBX: c6be42a0 ECX: 00000000 EDX: 00000001 ESI: 00000002 EDI: 00000000 EBP: c6bfff10 ESP: c6bffe9c DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Process 192.168.122.129 (pid: 3137, ti=c6bfe000 task=c6be42a0 task.ti=c6bfe000) Stack: 00000046 00000046 00000000 00000000 00000000 00000000 00000000 c1b8a3e0 <0> c6bfff0c c1ead970 c6be4760 00000041 c20d6b48 00000084 00000000 00000000 <0> 00000000 00000000 0000094d 00000000 c1b8a3e0 c6bfff40 c10277f8 c6bfff00 Call Trace: [] ? update_curr+0x208/0x270 [] ? lock_acquire+0x7e/0x110 [] ? nfs4_begin_drain_session+0x28/0x80 [] ? _raw_spin_lock+0x42/0x50 [] ? nfs4_begin_drain_session+0x28/0x80 [] ? nfs4_begin_drain_session+0x28/0x80 [] ? nfs4_run_state_manager+0x0/0x430 [] ? nfs4_run_state_manager+0x207/0x430 [] ? nfs4_run_state_manager+0x0/0x430 [] ? kthread+0x74/0x80 [] ? kthread+0x0/0x80 [] ? kernel_thread_helper+0x7/0x10 Code: fe ff ff e8 e8 ff 47 00 85 c0 74 dc 83 3d 20 0d 2a c2 00 75 d3 b8 75 6f a7 c1 ba b6 0a 00 00 e8 6c 2b fd ff 31 c0 eb c2 8b 45 c0 <8b> 40 04 85 c0 89 45 c8 0f 84 2b fe ff ff a1 c0 76 c7 c1 85 c0 EIP: [] __lock_acquire+0x21b/0x1880 SS:ESP 0068:c6bffe9c CR2: 0000000000000088 ---[ end trace 93dafd3a9c985071 ]--- note: 192.168.122.129[3137] exited with preempt_count 1