I am also seeing this bug on Ubuntu 11.04:
May 17 11:03:57 vuka kernel: [349751.630119] BUG: Dentry
ffff880198c0d0c0{i=b5ab,n=/} still in use (1) [unmount of autofs autofs]
May 17 11:03:57 vuka kernel: [349751.630138] ------------[ cut here
]------------
May 17 11:03:57 vuka kernel: [349751.630141] kernel BUG at
/build/buildd/linux-2.6.38/fs/dcache.c:947!
May 17 11:03:57 vuka kernel: [349751.630144] invalid opcode: 0000 [#1] SMP
May 17 11:03:57 vuka kernel: [349751.630147] last sysfs file:
/sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/uevent
May 17 11:03:57 vuka kernel: [349751.630150] CPU 1
May 17 11:03:57 vuka kernel: [349751.630151] Modules linked in: binfmt_misc
parport_pc ppdev autofs4 dm_crypt vesafb rfcomm sco bnep l2cap nfsd exportfs
nfs lockd fscache nfs_acl auth_rpcgss sunrpc nvidia(P) arc4
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm btusb
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device
bluetooth ath9k uvcvideo snd videodev v4l2_compat_ioctl32 mac80211 ath9k_common
serio_raw ath9k_hw ath sony_laptop cfg80211 soundcore snd_page_alloc joydev
nw_fermi lp parport dm_raid45 xor usbhid hid video firewire_ohci firewire_core
e1000e crc_itu_t sdhci_pci sdhci
May 17 11:03:57 vuka kernel: [349751.630197]
May 17 11:03:57 vuka kernel: [349751.630200] Pid: 26247, comm: automount
Tainted: P 2.6.38-8-generic #42-Ubuntu Sony Corporation
VPCL116FX/VAIO
May 17 11:03:57 vuka kernel: [349751.630206] RIP: 0010:[<ffffffff81179945>]
[<ffffffff81179945>] shrink_dcache_for_umount_subtree+0x285/0x290
May 17 11:03:57 vuka kernel: [349751.630215] RSP: 0018:ffff880189447de8
EFLAGS: 00010296
May 17 11:03:57 vuka kernel: [349751.630217] RAX: 000000000000006b RBX:
ffff880198c0d11c RCX: 000000000003ffff
May 17 11:03:57 vuka kernel: [349751.630220] RDX: 0000000000000000 RSI:
0000000000000086 RDI: 0000000000000246
May 17 11:03:57 vuka kernel: [349751.630222] RBP: ffff880189447e28 R08:
0000000000000033 R09: 000000000000fa75
May 17 11:03:57 vuka kernel: [349751.630224] R10: 0000000000000000 R11:
0000000000000001 R12: ffff880198c0d11c
May 17 11:03:57 vuka kernel: [349751.630227] R13: ffff880198c0d0c0 R14:
ffff880198c0d160 R15: 00007f882a3a7c50
May 17 11:03:57 vuka kernel: [349751.630230] FS: 00007f8826d26700(0000)
GS:ffff8800bfc80000(0000) knlGS:0000000000000000
May 17 11:03:57 vuka kernel: [349751.630233] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
May 17 11:03:57 vuka kernel: [349751.630235] CR2: 00007f88291255cc CR3:
00000001994ad000 CR4: 00000000000406e0
May 17 11:03:57 vuka kernel: [349751.630238] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
May 17 11:03:57 vuka kernel: [349751.630240] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
May 17 11:03:57 vuka kernel: [349751.630243] Process automount (pid: 26247,
threadinfo ffff880189446000, task ffff880199505b80)
May 17 11:03:57 vuka kernel: [349751.630245] Stack:
May 17 11:03:57 vuka kernel: [349751.630246] ffff880174205a58 ffffffff81177156
0000000000000000 ffff880174205800
May 17 11:03:57 vuka kernel: [349751.630251] ffff880198c0d11c ffff880198c0d0c0
00007f882a3a8060 00007f882a3a7c50
May 17 11:03:57 vuka kernel: [349751.630255] ffff880189447e58 ffffffff8117c2a1
ffff880189447e48 ffff880174205800
May 17 11:03:57 vuka kernel: [349751.630260] Call Trace:
May 17 11:03:57 vuka kernel: [349751.630264] [<ffffffff81177156>] ?
pollwake+0x56/0x60
May 17 11:03:57 vuka kernel: [349751.630268] [<ffffffff8117c2a1>]
shrink_dcache_for_umount+0x51/0x90
May 17 11:03:57 vuka kernel: [349751.630272] [<ffffffff81166bfc>]
generic_shutdown_super+0x2c/0x100
May 17 11:03:57 vuka kernel: [349751.630276] [<ffffffff81166d66>]
kill_anon_super+0x16/0x60
May 17 11:03:57 vuka kernel: [349751.630279] [<ffffffff81166dd7>]
kill_litter_super+0x27/0x30
May 17 11:03:57 vuka kernel: [349751.630284] [<ffffffffa0df94d8>]
autofs4_kill_sb+0x48/0x60 [autofs4]
May 17 11:03:57 vuka kernel: [349751.630288] [<ffffffff811671d5>]
deactivate_locked_super+0x45/0x70
May 17 11:03:57 vuka kernel: [349751.630291] [<ffffffff81167e5a>]
deactivate_super+0x4a/0x70
May 17 11:03:57 vuka kernel: [349751.630296] [<ffffffff81183254>]
mntput_no_expire+0xa4/0xf0
May 17 11:03:57 vuka kernel: [349751.630299] [<ffffffff811842e0>]
sys_umount+0x60/0xd0
May 17 11:03:57 vuka kernel: [349751.630303] [<ffffffff8100c002>]
system_call_fastpath+0x16/0x1b
May 17 11:03:57 vuka kernel: [349751.630305] 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
May 17 11:03:57 vuka kernel: [349751.630339] RIP [<ffffffff81179945>]
shrink_dcache_for_umount_subtree+0x285/0x290
May 17 11:03:57 vuka kernel: [349751.630344] RSP <ffff880189447de8>
May 17 11:03:57 vuka kernel: [349751.630347] ---[ end trace d5a7a561de5eec3d
]---
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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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