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From: William Dauchy <wdauchy@gmail.com>
Date: Tue, 31 Jul 2012 10:07:51 +0200
Message-ID: <CAJ75kXb=GpKFkOQRiMqqpoH6+wEOP4sh5spS4Y8y-k__mbE6kA@mail.gmail.com>
Subject: Re: wait_for_key_construction oops
To: "Myklebust, Trond" <Trond.Myklebust@netapp.com>
Cc: "Schumaker, Bryan" <Bryan.Schumaker@netapp.com>,
        Linux NFS mailing list <linux-nfs@vger.kernel.org>,
        David Howells <dhowells@redhat.com>
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On Tue, Jul 31, 2012 at 12:28 AM, Myklebust, Trond
<Trond.Myklebust@netapp.com> wrote:
> I'm therefore Ccing Bryan in case he knows of anything.

I guess that the fixes from David Howells (a427b9e) are related to my
oops I mentioned; particularly the point 4 in his commit.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000070
IP: [<ffffffff811a4a18>] wait_for_key_construction+0x28/0x70
PGD 2bf8de000
Oops: 0000 [#1] PREEMPT SMP
CPU 23
Pid: 25735, comm: kworker/23:2 Tainted: G        W    3.4.4 #1 Dell
Inc.  C6100           /0D61XP
RIP: 0010:[<ffffffff811a4a18>]  [<ffffffff811a4a18>]
wait_for_key_construction+0x28/0x70
RSP: 0018:ffff880b99a15a80  EFLAGS: 00010246
RAX: ffffffff811a4a70 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffffffff811a4a60 RSI: 0000000000000000 RDI: 0000000000000070
RBP: ffff8803c915e420 R08: ffff88061c877bc1 R09: 0000000000000000
R10: 0000000050159fb7 R11: 0000000000000000 R12: ffffffff816b5e49
R13: ffff880ba944ca48 R14: 0000000000000013 R15: ffff8803c915e423
FS:  0000000000000000(0000) GS:ffff880c3fd60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000070 CR3: 00000000014aa000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kworker/23:2 (pid: 25735, threadinfo ffff880b154a0ba0, task
ffff880b154a0750)
Stack:
0000000000000000 ffffffff811a512f 0000000000000000 ffffffff810df09d
0000000000000000 000000000000000e ffff880841b54cc0 ffffffff816c88f8
ffff8803c915e420 ffffffff81184fbb 0000000000000013 ffffffff81935c40
Call Trace:
[<ffffffff811a512f>] ? request_key+0x5f/0xa0
[<ffffffff810df09d>] ? __kmalloc+0x2d/0x120
[<ffffffff81184fbb>] ? nfs_idmap_request_key+0x1ab/0x1c0
[<ffffffff81185027>] ? nfs_idmap_get_key+0x57/0xd0
[<ffffffff811852ae>] ? nfs_map_string_to_numeric+0x3e/0xc0
[<ffffffff8118535f>] ? nfs_idmap_lookup_id+0x2f/0x80
[<ffffffff81185479>] ? nfs_map_name_to_uid+0x39/0x90
[<ffffffff8117dedb>] ? decode_getfattr_attrs+0x94b/0xa10
[<ffffffff8117f776>] ? T.1607+0x96/0xe0
[<ffffffff8117f852>] ? nfs4_xdr_dec_delegreturn+0x72/0x80
[<ffffffff8117f7e0>] ? decode_getfattr+0x20/0x20
[<ffffffff8144db39>] ? rpcauth_unwrap_resp+0x79/0x80
[<ffffffff8117f7e0>] ? decode_getfattr+0x20/0x20
[<ffffffff81445a33>] ? call_decode+0x2a3/0x400
[<ffffffff8144cf26>] ? __rpc_execute+0x46/0x1b0
[<ffffffff81050338>] ? process_one_work+0x108/0x3a0
[<ffffffff8144d0c0>] ? rpc_execute+0x30/0x30
[<ffffffff81050a21>] ? worker_thread+0x151/0x420
[<ffffffff810508d0>] ? rescuer_thread+0x300/0x300
[<ffffffff810508d0>] ? rescuer_thread+0x300/0x300
[<ffffffff81054e3e>] ? kthread+0x9e/0xb0
[<ffffffff81484774>] ? kernel_thread_helper+0x4/0x10
[<ffffffff81482a38>] ? retint_restore_args+0x6/0x6
[<ffffffff81054da0>] ? kthread_freezable_should_stop+0x60/0x60
[<ffffffff81484770>] ? gs_change+0xb/0xb
Code: 00 00 00 40 80 fe 01 53 19 c9 48 89 fb 48 c7 c0 70 4a 1a 81 f7
d1 48 c7 c2 60 4a 1a 81 83 c1 02 48 8d 7f 70 40 84 f6 48 0f 45 d0 <48>
8b 43 70 a8 10 75 20 48 8b 43 70 a8 20 74 08 8b 83 80 00 00
RIP  [<ffffffff811a4a18>] wait_for_key_construction+0x28/0x70
RSP <ffff880b99a15a80>
CR2: 0000000000000070
---[ end trace 59a8d5be7e929e25 ]---

-- 
William