The same issue just occured on a different PC. Here's the crash log.
[ 6425.780117] BUG: Dentry ffff88011c5463c0{i=7c81,n=} still in use (1)
[unmount of nfs4 0:1b]
[ 6425.780150] ------------[ cut here ]------------
[ 6425.780156] kernel BUG at /build/buildd/linux-2.6.38/fs/dcache.c:947!
[ 6425.780163] invalid opcode: 0000 [#1] SMP
[ 6425.780170] last sysfs file: /sys/devices/virtual/bdi/0:29/uevent
[ 6425.780175] CPU 3
[ 6425.780178] Modules linked in: snd_hrtimer binfmt_misc vboxnetadp vboxnetflt
vboxdrv des_generic autofs4 dm_crypt snd_hda_codec_realtek snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_seq_midi rpcsec_gss_krb5 snd_rawmidi
snd_seq_midi_event nfsd exportfs nfs lockd fscache snd_seq nfs_acl snd_timer
snd_seq_device auth_rpcgss nvidia(P) snd visor usbserial sunrpc firewire_sbp2
firewire_core crc_itu_t sp5100_tco soundcore edac_core lp psmouse
snd_page_alloc serio_raw edac_mce_amd k10temp i2c_piix4 joydev parport uvesafb
usbhid hid ahci r8169 libahci xhci_hcd pata_atiixp
[ 6425.780268]
[ 6425.780274] Pid: 30074, comm: umount.nfs4 Tainted: P
2.6.38-10-generic #46-Ubuntu To Be Filled By O.E.M. To Be Filled By
O.E.M./880GMH/USB3.
[ 6425.780289] RIP: 0010:[<ffffffff81179985>] [<ffffffff81179985>]
shrink_dcache_for_umount_subtree+0x285/0x290
[ 6425.780308] RSP: 0018:ffff880044dd7d78 EFLAGS: 00010292
[ 6425.780313] RAX: 0000000000000065 RBX: ffff88011c5463c0 RCX: 0000000000000000
[ 6425.780319] RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000246
[ 6425.780325] RBP: ffff880044dd7db8 R08: 0000000000000033 R09: 000000000000f142
[ 6425.780330] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011c54641c
[ 6425.780336] R13: ffff88011c5463c0 R14: ffff88011c698160 R15: ffff880109d61f5c
[ 6425.780343] FS: 00007f1834750720(0000) GS:ffff8800bfcc0000(0000)
knlGS:00000000f74d16c0
[ 6425.780349] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 6425.780354] CR2: 000000007d65c110 CR3: 00000000a7104000 CR4: 00000000000006e0
[ 6425.780359] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 6425.780365] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 6425.780372] Process umount.nfs4 (pid: 30074, threadinfo ffff880044dd6000,
task ffff88009a1e0000)
[ 6425.780376] Stack:
[ 6425.780380] ffff8800b877fa58 ffffffff8109ecb8 ffffffff00000002
ffff8800b877f800
[ 6425.780389] ffff88011c54665c ffff88011c546600 ffff880109d660c0
0000000000000000
[ 6425.780399] ffff880044dd7de8 ffffffff8117c2f9 0000000000000286
ffff8800b877f800
[ 6425.780408] Call Trace:
[ 6425.780419] [<ffffffff8109ecb8>] ? smp_call_function_many+0x198/0x280
[ 6425.780428] [<ffffffff8117c2f9>] shrink_dcache_for_umount+0x69/0x90
[ 6425.780439] [<ffffffff81166c1c>] generic_shutdown_super+0x2c/0x100
[ 6425.780447] [<ffffffff81166d86>] kill_anon_super+0x16/0x60
[ 6425.780475] [<ffffffffa0d5d2e9>] nfs4_kill_super+0x39/0x90 [nfs]
[ 6425.780485] [<ffffffff811671f5>] deactivate_locked_super+0x45/0x70
[ 6425.780494] [<ffffffff81167e7a>] deactivate_super+0x4a/0x70
[ 6425.780504] [<ffffffff81183294>] mntput_no_expire+0xa4/0xf0
[ 6425.780512] [<ffffffff811832ff>] mntput+0x1f/0x30
[ 6425.780520] [<ffffffff81183bb2>] release_mounts+0x72/0x90
[ 6425.780529] [<ffffffff811841a2>] do_umount+0xd2/0x1f0
[ 6425.780537] [<ffffffff81184383>] sys_umount+0xc3/0xd0
[ 6425.780545] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
[ 6425.780551] Code: 8b 40 28 4c 8b 08 49 8b 45 30 48 85 c0 74 07 48 8b 90 a8
00 00 00 48 89 34 24 48 c7 c7 50 71 7e 81 4c 89 ee 31 c0 e8 b4 6a 44 00 <0f> 0b
0f 0b 0f 1f 80 00 00 00 00 55 48 89 e5 48 83 ec 20 48 89
[ 6425.780619] RIP [<ffffffff81179985>]
shrink_dcache_for_umount_subtree+0x285/0x290
[ 6425.780631] RSP <ffff880044dd7d78>
[ 6425.780639] ---[ end trace 9165faca448d3163 ]---
I tried to run 'apport-collect 806429', but it did not finish (after
waiting several minutes). I suppose it hangs, because my HOME directory
is no longer accessible due to this issue.
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https://bugs.launchpad.net/bugs/806429
Title:
kernel oops caused by umounting nfs4
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