For our development work we have a 10.10 x86_64 server running on a HP Proliant 150.
The users need to mount some resources from a windows pc in their home directories. Therefore we have multiple (approx 12) cifs mounts to various pcs to their homes.
However, sometimes people walk away with their laptop without unmounting, and then the cifs mounts become inaccessible.
From there on we get all kinds of strange problems, like unable to unmount the mount, hanging processes (for example cat /proc/mounts hangs) and strange kernel messages (see end of post)
Questions: Is it possible to auto unmount disconnected windows pc's? How to unmount those cifs mounts ? Is there a better way to mount the cifs shares automatically ?
kernel log:
Aug 15 09:42:00 barabas kernel: [517026.729192] CPU 8
Aug 15 09:42:00 barabas kernel: [517026.729193] Modules linked in: nls_cp437 cifs binfmt_misc ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel bridge stp kvm nfsd exportfs nfs parport_pc ppdev lockd fscache nfs_acl auth_rpcgss sunrpc radeon ttm i7core_edac drm_kms_helper ipmi_si psmouse drm ipmi_msghandler hpilo edac_core serio_raw shpchp i2c_algo_bit power_meter lp parport usbhid tg3 hid hpsa cciss
Aug 15 09:42:00 barabas kernel: [517026.729220]
Aug 15 09:42:00 barabas kernel: [517026.729222] Pid: 16347, comm: smbd Tainted: G D 2.6.35-22-server #35-Ubuntu /ProLiant ML350 G6
Aug 15 09:42:00 barabas kernel: [517026.729224] RIP: 0010:[<ffffffffa050f36e>] [<ffffffffa050f36e>] cifs_show_options+0xfe/0x480 [cifs]
Aug 15 09:42:00 barabas kernel: [517026.729228] RSP: 0018:ffff88015ea83de8 EFLAGS: 00010246
Aug 15 09:42:00 barabas kernel: [517026.729230] RAX: 0000000000000000 RBX: ffff880134aaf2c0 RCX: 0000000000000006
Aug 15 09:42:00 barabas kernel: [517026.729231] RDX: 0000000000000006 RSI: 0000000000001000 RDI: ffff88003fe9a43b
Aug 15 09:42:00 barabas kernel: [517026.729233] RBP: ffff88015ea83e18 R08: 000000000000fffb R09: 0000ffffffffff0a
Aug 15 09:42:00 barabas kernel: [517026.729235] R10: 0000000000000001 R11: 0000000000000007 R12: ffff88010c85a400
Aug 15 09:42:00 barabas kernel: [517026.729236] R13: ffff8802cf78eb00 R14: ffff8802cf78fb00 R15: 0000000000000000
Aug 15 09:42:00 barabas kernel: [517026.729238] FS: 00007f8b9c238720(0000) GS:ffff880001e80000(0000) knlGS:0000000000000000
Aug 15 09:42:00 barabas kernel: [517026.729240] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 15 09:42:00 barabas kernel: [517026.729242] CR2: 0000000000000048 CR3: 00000002bee5d000 CR4: 00000000000006e0
Aug 15 09:42:00 barabas kernel: [517026.729243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 15 09:42:00 barabas kernel: [517026.729245] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug 15 09:42:00 barabas kernel: [517026.729247] Process smbd (pid: 16347, threadinfo ffff88015ea82000, task ffff88007df344a0)
Aug 15 09:42:00 barabas kernel: [517026.729249] ffff88015ea83e18 ffff880134aaf2c0 ffff8802cf78fb00 ffff8802cf78fb60
Aug 15 09:42:00 barabas kernel: [517026.729251] <0> ffffffff8161c050 0000000000000000 ffff88015ea83e68 ffffffff8116ddd2
Aug 15 09:42:00 barabas kernel: [517026.729254] <0> ffff8802cf78fb00 ffff88016cff43c0 00007f8b00000000 ffff880134aaf2c0
Aug 15 09:42:00 barabas kernel: [517026.729262] [<ffffffff8116ddd2>] show_vfsmnt+0x112/0x150
Aug 15 09:42:00 barabas kernel: [517026.729265] [<ffffffff81172137>] seq_read+0x267/0x3f0
Aug 15 09:42:00 barabas kernel: [517026.729269] [<ffffffff81153555>] vfs_read+0xb5/0x1a0
Aug 15 09:42:00 barabas kernel: [517026.729271] [<ffffffff81153691>] sys_read+0x51/0x80
Aug 15 09:42:00 barabas kernel: [517026.729275] [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b
Aug 15 09:42:00 barabas kernel: [517026.729302] RSP <ffff88015ea83de8>
Aug 15 09:42:00 barabas kernel: [517026.729304] ---[ end trace 2a77066ff2044fef ]---
Aug 15 09:42:00 barabas kernel: [517026.829868] PGD 0
Aug 15 09:42:00 barabas kernel: [517026.829874] CPU 8
Aug 15 09:42:00 barabas kernel: [517026.829875] Modules linked in: nls_cp437 cifs binfmt_misc ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel bridge stp kvm nfsd exportfs nfs parport_pc ppdev lockd fscache nfs_acl auth_rpcgss sunrpc radeon ttm i7core_edac drm_kms_helper ipmi_si psmouse drm ipmi_msghandler hpilo edac_core serio_raw shpchp i2c_algo_bit power_meter lp parport usbhid tg3 hid hpsa cciss
