Same here, occurred on Kubuntu Natty when automount tried to umount a
nfs4 share that uses Kerberos authentication.
The trace:
BUG: Dentry ffff8800a0c530c0{i=2,n=} still in use (1) [unmount of nfs4 0:18]
------------[ cut here ]------------
kernel BUG at /build/buildd/linux-2.6.38/fs/dcache.c:947!
invalid opcode: 0000 [#1] SMP
last sysfs file:
/sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/voltage_now
CPU 3
Modules linked in: des_generic cryptd aes_x86_64 aes_generic nf_conntrack_ipv4
nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables
binfmt_misc vboxnetadp vboxnetflt vboxdrv parport_pc dm_crypt ppdev autofs4
snd_hda_codec_hdmi rpcsec_gss_krb5 snd_hda_codec_realtek nfsd exportfs nfs
snd_hda_intel snd_hda_codec lockd fscache snd_hwdep snd_pcm nfs_acl
snd_seq_midi snd_rawmidi snd_seq_midi_event uvcvideo auth_rpcgss snd_seq
videodev arc4 ath9k mac80211 v4l2_compat_ioctl32 snd_timer snd_seq_device
ath9k_common ath9k_hw sunrpc snd joydev ath psmouse lp soundcore cfg80211
sony_laptop serio_raw snd_page_alloc parport radeon hid_a4tech usbhid hid ttm
ahci sky2 drm_kms_helper sdhci_pci drm libahci sdhci i2c_algo_bit video
Pid: 12448, comm: umount.nfs4 Not tainted 2.6.38-8-generic #42-Ubuntu Sony
Corporation VPCEB1M1E/VAIO
RIP: 0010:[<ffffffff81179945>] [<ffffffff81179945>]
shrink_dcache_for_umount_subtree+0x285/0x290
RSP: 0018:ffff880052f59d78 EFLAGS: 00010292
RAX: 0000000000000062 RBX: ffff8800a0c530c0 RCX: 000000000003ffff
RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000246
RBP: ffff880052f59db8 R08: 0000000000000033 R09: 000000000001125a
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800a0c5311c
R13: ffff8800a0c530c0 R14: ffff88006f4d2be0 R15: ffff8800a0e557dc
FS: 00007f4153fd6720(0000) GS:ffff8800decc0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4153b380d0 CR3: 00000000a52af000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process umount.nfs4 (pid: 12448, threadinfo ffff880052f58000, task
ffff88001bbadb80)
Stack:
ffff8800294c4a58 ffff88011780d2a8 0000000000000000 ffff8800294c4800
ffff8800a0c531dc ffff8800a0c53180 ffff880048071780 0000000000000000
ffff880052f59de8 ffffffff8117c2b9 ffffffff8105f640 ffff8800294c4800
Call Trace:
[<ffffffff8117c2b9>] shrink_dcache_for_umount+0x69/0x90
[<ffffffff8105f640>] ? default_wake_function+0x0/0x20
[<ffffffff81166bfc>] generic_shutdown_super+0x2c/0x100
[<ffffffff81166d66>] kill_anon_super+0x16/0x60
[<ffffffffa04982e9>] nfs4_kill_super+0x39/0x90 [nfs]
[<ffffffff811671d5>] deactivate_locked_super+0x45/0x70
[<ffffffff81167e5a>] deactivate_super+0x4a/0x70
[<ffffffff81183254>] mntput_no_expire+0xa4/0xf0
[<ffffffff811832bf>] mntput+0x1f/0x30
[<ffffffff81183b72>] release_mounts+0x72/0x90
[<ffffffff81184162>] do_umount+0xd2/0x1f0
[<ffffffff81184343>] sys_umount+0xc3/0xd0
[<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
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 6c 7e 81 4c 89 ee 31 c0 e8 94 66 44 00 <0f> 0b 0f 0b 0f 1f 80
00 00 00 00 55 48 89 e5 48 83 ec 20 48 89
RIP [<ffffffff81179945>] shrink_dcache_for_umount_subtree+0x285/0x290
RSP <ffff880052f59d78>
---[ end trace aa2a76a56539adc3 ]---
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https://bugs.launchpad.net/bugs/742084
Title:
kernel BUG on network mounts (GVFS/SSH and AutoFS/NFS)
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