Comment 22 for bug 769927

After some testing of the latest released Ubuntu kernel version (2.6.38-10-server) I have to unfortunately report that the problem still persists. Thus, the kernel still seems to Oops at the very same location. See the attached dmesg output:

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[662197.101766] BUG: Dentry ffff880052fdab40{i=9ce3e,n=/} still in use (1) [unmount of autofs autofs]
[662197.102634] ------------[ cut here ]------------
[662197.103007] kernel BUG at /build/buildd/linux-2.6.38/fs/dcache.c:947!
[662197.103457] invalid opcode: 0000 [#1] SMP
[662197.103814] last sysfs file: /sys/devices/virtual/bdi/0:46/uevent
[662197.104284] CPU 1
[662197.104351] Modules linked in: autofs4 ppdev psmouse serio_raw vmw_balloon nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc parport_pc i2c_piix4 vmxnet3 shpchp lp parport floppy e1000 mptspi mptscsih mptbase vmw_pvscsi
[662197.106028]
[662197.106316] Pid: 25545, comm: automount Not tainted 2.6.38-10-server #46-Ubuntu VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
[662197.107209] RIP: 0010:[<ffffffff81179c15>] [<ffffffff81179c15>] shrink_dcache_for_umount_subtree+0x285/0x290
[662197.108003] RSP: 0018:ffff880071913de8 EFLAGS: 00010296
[662197.108411] RAX: 000000000000006c RBX: ffff880052fdab9c RCX: 00000000ffffffff
[662197.109083] RDX: 0000000000000000 RSI: 0000000000000086 RDI: 0000000000000246
[662197.109760] RBP: ffff880071913e28 R08: 0000000000000000 R09: ffffffff816423e0
[662197.110375] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880052fdab9c
[662197.110820] R13: ffff880052fdab40 R14: ffff880052fdabe0 R15: 00007f7343c15c10
[662197.111240] FS: 00007f734339f700(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
[662197.111462] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[662197.111462] CR2: 00007f7343399ab8 CR3: 0000000070a9b000 CR4: 00000000000006e0
[662197.111462] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[662197.111462] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[662197.111462] Process automount (pid: 25545, threadinfo ffff880071912000, task ffff88001403db80)
[662197.111462] Stack:
[662197.111462] ffff8800782cd658 ffff880071840000 ffff880071913e08 ffff8800782cd400
[662197.111462] ffff880052fdab9c ffff880052fdab40 00007f7343c160f0 00007f7343c15c10
[662197.111462] ffff880071913e58 ffffffff8117c551 ffff880071913e48 ffff8800782cd400
[662197.111462] Call Trace:
[662197.111462] [<ffffffff8117c551>] shrink_dcache_for_umount+0x51/0x90
[662197.111462] [<ffffffff811670bc>] generic_shutdown_super+0x2c/0x100
[662197.111462] [<ffffffff81167226>] kill_anon_super+0x16/0x60
[662197.111462] [<ffffffff81167297>] kill_litter_super+0x27/0x30
[662197.111462] [<ffffffffa02054d8>] autofs4_kill_sb+0x48/0x60 [autofs4]
[662197.111462] [<ffffffff81167695>] deactivate_locked_super+0x45/0x70
[662197.111462] [<ffffffff8116831a>] deactivate_super+0x4a/0x70
[662197.111462] [<ffffffff811834d4>] mntput_no_expire+0xa4/0xf0
[662197.111462] [<ffffffff81184560>] sys_umount+0x60/0xd0
[662197.111462] [<ffffffff8100bfc2>] system_call_fastpath+0x16/0x1b
[662197.111462] 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 a8 a9 7e 81 4c 89 ee 31 c0 e8 70 b3 45 00 <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 55 48 89 e5 48 83 ec 20 48 89
[662197.111462] RIP [<ffffffff81179c15>] shrink_dcache_for_umount_subtree+0x285/0x290
[662197.111462] RSP <ffff880071913de8>
[662197.119704] ---[ end trace f71999068ae06ec2 ]---
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So please raise your attention to that bug again as it is a quite annoying and important one to fix as it has a big impact on system stability and server use of ubuntu.