Description of problem:

Unkown caused kernel oops in NFS .

The System had an oops message and mount.nfs and mysqld where in a D state. 

I think, nfs caused the problem and mysql was involved only because it takes locks to any filesystem it can get it hands on :) . 

The system rebooted hours later without problems and i can see in the logfiles of some other daemons, that they acted normal after that oops . Ofcourse except mysql and nfs .

Version-Release number of selected component (if applicable):

3.4.4-4.fc16.i686.PAE #1

Actual results:

[732335.001862] BUG: unable to handle kernel NULL pointer dereference at 00000014
[732335.001919] IP: [<e09938e1>] lockd_down+0x21/0xa0 [lockd]
[732335.001931] *pdpt = 0000000000000000 *pde = 0000000000000000 
[732335.001938] Oops: 0000 [#1] SMP 
[732335.001943] Modules linked in: nfs lockd fscache auth_rpcgss nfs_acl sunrpc tpm_bios xt_multiport ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables xenfs xen_privcmd coretemp crc32c_intel microcode xen_netfront xen_blkfront [last unloaded: scsi_wait_scan]
[732335.001974] 
[732335.001978] Pid: 32728, comm: mysqld Not tainted 3.4.2-1.fc16.i686.PAE #1 
[732335.001986] EIP: 0061:[<e09938e1>] EFLAGS: 00210246 CPU: 0
[732335.001994] EIP is at lockd_down+0x21/0xa0 [lockd]
[732335.001998] EAX: 00000000 EBX: cfcda800 ECX: 00000004 EDX: c65c4000
[732335.002004] ESI: df6f3000 EDI: dcebed80 EBP: c65c5e74 ESP: c65c5e6c
[732335.002009]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[732335.002016] CR0: 8005003b CR2: 00000014 CR3: 00c9b000 CR4: 00002660
[732335.002022] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[732335.002028] DR6: ffff0ff0 DR7: 00000400
[732335.002032] Process mysqld (pid: 32728, ti=c65c4000 task=c1228c80 task.ti=c65c4000)
[732335.002039] Stack:
[732335.002041]  e0a4de1c cfcda800 c65c5e7c e0990012 c65c5e84 e0a152f4 c65c5e9c e0a16d22
[732335.002054]  00000020 d3c34000 cfcda800 d3c34000 c65c5eac e0a2186c d3c34000 e0a5b134
[732335.002056]  c65c5ebc c05476d0 d3c34000 d45ae010 c65c5ecc c0548057 d45ae000 d45ae010
[732335.002056] Call Trace:
[732335.002056]  [<e0a4de1c>] ? nfs_fscache_release_super_cookie+0x6c/0xa0 [nfs]
[732335.002056]  [<e0990012>] nlmclnt_done+0x12/0x20 [lockd]
[732335.002056]  [<e0a152f4>] nfs_destroy_server+0x24/0x30 [nfs]
[732335.002056]  [<e0a16d22>] nfs_free_server+0xa2/0x140 [nfs]
[732335.002056]  [<e0a2186c>] nfs_kill_super+0x2c/0x40 [nfs]
[732335.002056]  [<c05476d0>] deactivate_locked_super+0x30/0x80
[732335.002056]  [<c0548057>] deactivate_super+0x47/0x60
[732335.002056]  [<c055ebe2>] mntput_no_expire+0xb2/0x100
[732335.002056]  [<c055ec4d>] mntput+0x1d/0x30
[732335.002056]  [<c055f474>] release_mounts+0x64/0x80
[732335.002056]  [<c0560ae7>] put_mnt_ns+0x57/0x70
[732335.002056]  [<c0469aa7>] free_nsproxy+0x17/0x90
[732335.002056]  [<c0469ca3>] switch_task_namespaces+0x43/0x50
[732335.002056]  [<c0469cbf>] exit_task_namespaces+0xf/0x20
[732335.002056]  [<c044accc>] do_exit+0x3dc/0x7e0
[732335.002056]  [<c044b367>] do_group_exit+0x37/0xa0
[732335.002056]  [<c044b3e8>] sys_exit_group+0x18/0x20
[732335.002056]  [<c095739f>] sysenter_do_call+0x12/0x28
[732335.002056] Code: 67 00 00 8d b4 26 00 00 00 00 55 89 e5 83 ec 08 3e 8d 74 26 00 b8 a0 e2 99 e0 e8 9b a9 fb df 64 a1 90 af c8 c0 8b 80 8c 03 00 00 <8b> 40 14 e8 47 ff ff ff a1 f0 f2 99 e0 85 c0 74 44 83 e8 01 85 
[732335.002056] EIP: [<e09938e1>] lockd_down+0x21/0xa0 [lockd] SS:ESP 0069:c65c5e6c
[732335.002056] CR2: 0000000000000014
[732335.002308] ---[ end trace a004e8b5d8c93ed4 ]---
[732335.002314] Fixing recursive fault but reboot is needed!