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	Mon, 17 Sep 2012 09:02:12 -0400
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Date: Mon, 17 Sep 2012 09:02:09 -0400
From: Bryan Schumaker <bjschuma@netapp.com>
MIME-Version: 1.0
To: Nick Bowler <nbowler@elliptictech.com>
CC: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: Re: PROBLEM: kernel BUG at fs/nfs/idmap.c:684!
References: <20120914192056.GA15530@elliptictech.com>
In-Reply-To: <20120914192056.GA15530@elliptictech.com>
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Sender: linux-nfs-owner@vger.kernel.org
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Hi Nick,

Two questions:
1) How sure are you that you're using v3?  Make sure you're using the 'vers=3' mount option.  I'm not sure which version of nfs-utils Debian uses, but recent versions set v4 as the default.
2) Can you try Linux 3.5.4?  Patches for the idmapper issue have already been accepted.

- Bryan

On 09/14/2012 03:20 PM, Nick Bowler wrote:
> Hi folks,
> 
> I just upgraded an NFSv3 client machine to Linux 3.5.3 and am seeing the
> following BUG.  It occurs reproducibly a short time after the first
> login in to the machine after boot (within one minute).  There's a lot
> of nfs4-looking functions in backtrace, which is weird as there are
> absolutely no NFSv4 mounts.  The system still mostly works, although
> tab completion in my shell seems to either not complete anything or
> hang forever, which could be related as there are NFS-mounted
> directories in my PATH.
> 
> Curiously, there are other machines on the same network running this
> same kernel version that do *not* have this problem.  A couple unique
> things about the crashing machine that immediately come to mind...
> 
>  - Userspace is running Debian stable (so tends to be pretty old).
>  - Its onboard network is quite different from our other machines
>    (it has a Marvell chipset using the sky2 driver).
> 
> Please let me know if you need any more info.
> 
> ------------[ cut here ]------------
> kernel BUG at fs/nfs/idmap.c:684!
> invalid opcode: 0000 [#1] PREEMPT SMP 
> CPU 0 
> Modules linked in: ah4 xfrm4_mode_transport nfs lockd auth_rpcgss nfs_acl sunrpc autofs4 acpi_cpufreq mperf deflate zlib_deflate ctr aes_x86_64 aes_generic des_generic cbc sha512_generic sha256_generic sha1_ssse3 sha1_generic md5 hmac crypto_null af_key xfrm_algo ipv6 loop snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc i2c_i801 skge coretemp hwmon lpc_ich evdev mfd_core sky2
> 
> Pid: 2450, comm: mount.nfs Not tainted 3.5.3 #15 LENOVO 0841A5U/LENOVO
> RIP: 0010:[<ffffffffa01d8081>]  [<ffffffffa01d8081>] nfs_idmap_legacy_upcall+0x10c/0x15e [nfs]
> RSP: 0018:ffff8800755c53f8  EFLAGS: 00010286
> RAX: 0000000000000015 RBX: ffff880078d4ba80 RCX: 0000000000000000
> RDX: 0000000000000080 RSI: ffff880076e40ed9 RDI: ffff880078d4ba97
> RBP: ffff8800755c5448 R08: ffff880078d4ba82 R09: 0000000000000015
> R10: ffff88007f40b000 R11: ffff8800755c5288 R12: ffff880078dfe880
> R13: ffff880076dc1f40 R14: ffff880078dfebc0 R15: ffff880078d4b780
> FS:  00007fb0bc00d700(0000) GS:ffff88007f400000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000dd9000 CR3: 00000000755b8000 CR4: 00000000000407f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process mount.nfs (pid: 2450, threadinfo ffff8800755c4000, task ffff88007b838000)
> Stack:
>  0031396364396565 ffffffff81364e2a ffff880076e40ec4 ffff880076e40ed9
>  ffffffff81625be0 ffff880078d4b780 ffff880076dc1f40 ffff880078d4bb40
>  ffff880076c16600 ffff880076c166c0 ffff8800755c54e8 ffffffff8115bb02
> Call Trace:
>  [<ffffffff81364e2a>] ? kmemleak_alloc+0x21/0x3e
>  [<ffffffff8115bb02>] request_key_and_link+0x306/0x389
>  [<ffffffff810c5378>] ? create_object+0x27e/0x290
>  [<ffffffff8115bbd7>] request_key_with_auxdata+0x1b/0x4c
>  [<ffffffffa01d81a0>] nfs_idmap_request_key+0xcd/0x187 [nfs]
>  [<ffffffffa01d82d4>] nfs_idmap_get_key+0x7a/0x99 [nfs]
>  [<ffffffffa01d84ac>] nfs_idmap_lookup_id+0x23/0x52 [nfs]
>  [<ffffffffa01d852e>] nfs_map_group_to_gid+0x53/0x5a [nfs]
>  [<ffffffffa01d28cf>] decode_getfattr_attrs+0x591/0xa0c [nfs]
>  [<ffffffff81001624>] ? __switch_to+0x2d/0x355
>  [<ffffffffa01d472d>] T.1600+0x78/0xab [nfs]
>  [<ffffffffa01d476e>] decode_getfattr+0xe/0x10 [nfs]
>  [<ffffffffa01d4988>] nfs4_xdr_dec_lookup_root+0x54/0x5d [nfs]
>  [<ffffffffa016e707>] ? rpc_queue_empty+0x29/0x29 [sunrpc]
>  [<ffffffffa01d4934>] ? nfs4_xdr_dec_link+0xa9/0xa9 [nfs]
>  [<ffffffffa016f60c>] rpcauth_unwrap_resp+0x56/0x61 [sunrpc]
>  [<ffffffffa016e707>] ? rpc_queue_empty+0x29/0x29 [sunrpc]
>  [<ffffffffa01d4934>] ? nfs4_xdr_dec_link+0xa9/0xa9 [nfs]
>  [<ffffffffa0168d80>] call_decode+0x2c3/0x31b [sunrpc]
>  [<ffffffffa016ec9d>] __rpc_execute+0x51/0x179 [sunrpc]
>  [<ffffffff8104574b>] ? wake_up_bit+0x20/0x25
>  [<ffffffffa016edec>] rpc_execute+0x27/0x2b [sunrpc]
>  [<ffffffffa01693cd>] rpc_run_task+0x79/0x81 [sunrpc]
>  [<ffffffffa01694b3>] rpc_call_sync+0x3f/0x60 [sunrpc]
>  [<ffffffffa01ca253>] _nfs4_call_sync+0xe/0x10 [nfs]
>  [<ffffffffa01cbc74>] _nfs4_lookup_root+0x9a/0xa8 [nfs]
>  [<ffffffffa01cbcb9>] nfs4_lookup_root+0x37/0x62 [nfs]
>  [<ffffffffa01cbd07>] nfs4_proc_get_rootfh+0x23/0x95 [nfs]
>  [<ffffffffa01bb87a>] nfs4_get_rootfh+0x36/0xb6 [nfs]
>  [<ffffffff81364e2a>] ? kmemleak_alloc+0x21/0x3e
>  [<ffffffff810bdd8e>] ? kmem_cache_alloc+0xc9/0xd8
>  [<ffffffffa01b7111>] nfs4_server_common_setup+0x57/0xc7 [nfs]
>  [<ffffffffa01b7c87>] nfs4_create_server+0x1d7/0x202 [nfs]
>  [<ffffffff81364dd8>] ? kmemleak_alloc_percpu+0x63/0x94
>  [<ffffffffa01bf7f2>] nfs4_remote_mount+0x36/0x5f [nfs]
>  [<ffffffff810c96b2>] mount_fs+0x6b/0x14f
>  [<ffffffff810a7824>] ? __alloc_percpu+0xb/0xd
>  [<ffffffff810e0385>] vfs_kern_mount+0x66/0xdf
>  [<ffffffffa01bfadb>] nfs_do_root_mount+0x96/0xb5 [nfs]
>  [<ffffffffa01c060a>] nfs_fs_mount+0x7bf/0x8f8 [nfs]
>  [<ffffffffa01bf52e>] ? nfs_fill_super+0xc4/0xc4 [nfs]
>  [<ffffffffa01be8dd>] ? nfs_request_mount+0x1b2/0x1b2 [nfs]
>  [<ffffffff810c96b2>] mount_fs+0x6b/0x14f
>  [<ffffffff810a7824>] ? __alloc_percpu+0xb/0xd
>  [<ffffffff810e0385>] vfs_kern_mount+0x66/0xdf
>  [<ffffffff810e0468>] do_kern_mount+0x48/0xd8
>  [<ffffffff810e0c10>] do_mount+0x718/0x77b
>  [<ffffffff810e0cf6>] sys_mount+0x83/0xbd
>  [<ffffffff81376522>] system_call_fastpath+0x16/0x1b
> Code: b3 84 00 00 00 48 8d 7d c0 c6 43 01 00 e8 59 1e fb e0 85 c0 49 89 5c 24 10 49 c7 44 24 18 8c 00 00 00 78 1e 49 83 7e 08 00 74 04 <0f> 0b eb fe 49 8b 3e 4d 89 6e 08 4c 89 e6 e8 1f 27 fa ff 85 c0 
> RIP  [<ffffffffa01d8081>] nfs_idmap_legacy_upcall+0x10c/0x15e [nfs]
>  RSP <ffff8800755c53f8>
> ---[ end trace ee7d4fa42e626e1f ]---
>