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From: <tao.peng@emc.com>
To: <bhalevy@tonian.com>
CC: <linux-nfs@vger.kernel.org>
Date: Tue, 13 Sep 2011 08:02:48 -0400
Subject: RE: NULL pointer dereference during mount
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> -----Original Message-----
> From: linux-nfs-owner@vger.kernel.org [mailto:linux-nfs-owner@vger.kernel.org]
> On Behalf Of tao.peng@emc.com
> Sent: Tuesday, September 13, 2011 7:55 PM
> To: bhalevy@tonian.com
> Cc: linux-nfs@vger.kernel.org
> Subject: NULL pointer dereference during mount
> 
> Hi, Benny,
> 
> After rebasing to your pnfs-all-latest branch, I always got bellow NULL pointer
> dereference for both nfsv4 and pnfs. Do you know of any recent change that can
> cause this?
Just verified that Trond's nfs-for-next branch is working. So should be something only in your tree.

> 
> [   81.468606] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000030
> [   81.468919] IP: [<ffffffff8120ca85>] selinux_set_mnt_opts+0x4f/0x3fb
> [   81.469174] PGD 2ffc067 PUD 2e84067 PMD 0
> [   81.469455] Oops: 0000 [#1] SMP
> [   81.469455] CPU 0
> [   81.469455] Modules linked in: blocklayoutdriver nfs lockd fscache auth_rpcgss
> nfs_acl ebtable_nat ebtables ipt_MASQUERADE ipt
> able_nat nf_nat xt_CHECKSUM iptable_mangle bridge stp llc sunrpc ip6t_REJECT
> be2iscsi nf_conntrack_ipv6 nf_defrag_ipv6 iscsi_boot
> _sysfs bnx2i ip6table_filter cnic uio ip6_tables cxgb3i libcxgbi cxgb3 mdio iscsi_tcp
> libiscsi_tcp libiscsi scsi_transport_iscsi
> pcspkr e1000 i2c_piix4 ppdev shpchp i2c_core parport_pc parport vmw_balloon
> microcode ipv6 mptspi mptscsih mptbase scsi_transport
> _spi [last unloaded: nfs]
> [   81.469455]
> [   81.469455] Pid: 1919, comm: mount.nfs Not tainted 3.1.0-rc3+ #3 VMware, Inc.
> VMware Virtual Platform/440BX Desktop Reference
> Platform
> [   81.469455] RIP: 0010:[<ffffffff8120ca85>]  [<ffffffff8120ca85>]
> selinux_set_mnt_opts+0x4f/0x3fb
> [   81.469455] RSP: 0018:ffff88000d22fb28  EFLAGS: 00010296
> [   81.469455] RAX: 0000000000000000 RBX: ffff880008460200 RCX:
> 0000000000000000
> [   81.469455] RDX: 0000000000000000 RSI: ffff880008460390 RDI:
> ffff8800003dc800
> [   81.469455] RBP: ffff88000d22fbb8 R08: 0000000000000001 R09:
> 0000000000000000
> [   81.469455] R10: 0000ffff00066c0a R11: 0000000000000000 R12:
> ffff880000019a00
> [   81.469455] R13: ffff8800003dc800 R14: ffff880008460390 R15:
> ffff8800003dc800
> [   81.469455] FS:  00007ffebe637720(0000) GS:ffff880017400000(0000)
> knlGS:0000000000000000
> [   81.469455] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   81.469455] CR2: 0000000000000030 CR3: 000000000ce79000 CR4:
> 00000000000006f0
> [   81.469455] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [   81.469455] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> 0000000000000400
> [   81.469455] Process mount.nfs (pid: 1919, threadinfo ffff88000d22e000, task
> ffff88000cb08000)
> [   81.469455] Stack:
> [   81.469455]  ffffea0000031880 ffff880000000008 0000000000000000
> ffff88000d22fb48
> [   81.469455]  ffff88000d22fb78 ffffffffa02fe5ee 0000000180150011
> ffff88000a308cc0
> [   81.469455]  0000000000000001 0000000000000001 ffff88000d22fbc8
> ffffffffa02caac5
> [   81.469455] Call Trace:
> [   81.469455]  [<ffffffffa02caac5>] ? nfs4_get_root+0x20f/0x242 [nfs]
> [   81.469455]  [<ffffffff8120504e>] security_sb_set_mnt_opts+0x16/0x18
> [   81.469455]  [<ffffffffa02ce6bd>] nfs4_remote_mount+0x17c/0x1ff [nfs]
> [   81.469455]  [<ffffffff8112fde6>] mount_fs+0x69/0x157
> [   81.469455]  [<ffffffff810fb000>] ? __alloc_percpu+0x10/0x12
> [   81.469455]  [<ffffffff811444ca>] vfs_kern_mount+0x63/0xa0
> [   81.469455]  [<ffffffffa02ce9b8>] nfs_do_root_mount+0x7b/0x9a [nfs]
> [   81.469455]  [<ffffffffa02cec8f>] nfs4_try_mount+0x58/0xba [nfs]
> [   81.469455]  [<ffffffffa02cfff1>] nfs_fs_mount+0x48b/0x6e9 [nfs]
> [   81.469455]  [<ffffffff8112fde6>] mount_fs+0x69/0x157
> [   81.469455]  [<ffffffff810fb000>] ? __alloc_percpu+0x10/0x12
> [   81.469455]  [<ffffffff811444ca>] vfs_kern_mount+0x63/0xa0
> [   81.469455]  [<ffffffff811451be>] do_kern_mount+0x4d/0xdf
> [   81.469455]  [<ffffffff8114685d>] do_mount+0x63c/0x69f
> [   81.469455]  [<ffffffff81146185>] ? copy_mount_options+0xcb/0x12e
> [   81.469455]  [<ffffffff81146b6e>] sys_mount+0x88/0xc2
> [   81.469455]  [<ffffffff8147e502>] system_call_fastpath+0x16/0x1b
> [   81.469455] Code: 00 00 4c 8b a7 a8 01 00 00 49 89 fd 48 8b 56 08 48 89 45 a8
> 48 8b 47 28 48 89 55 80 48 8b 00 48 89 45 98 49 8b 04 24 48 8b 40 60
> [   81.469455]  8b 40 30 48 8b 40 38 48 89 45 a0 48 8b 06 8b 76 10 48 89 45
> [   81.469455] RIP  [<ffffffff8120ca85>] selinux_set_mnt_opts+0x4f/0x3fb
> [   81.469455]  RSP <ffff88000d22fb28>
> [   81.469455] CR2: 0000000000000030
> [   81.513181] ---[ end trace dccee53f6c438566 ]---
> 
> 
> 
> Cheers,
> -Bergwolf
> 
> 
> --
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