cifs mounts and unmounts properly for a day or so, then hangs on future mounts

[Dan VerWeire]

Binary package hint: samba

I have a script that every hour mounts a share using CIFS, copies some files, then unmounts the share. This works for a day or so, then I am unable to mount any CIFS shares. I cannot rmmod cifs. In order to mount shares again, I must reboot my machine.

kernel 2.6.26 on Hardy
ps aux | grep cifs shows a bunch of /sbin/mount.cifs processes that are in state D (Uninterruptible sleep)
    -Also, [cifsd] is in state D
/etc/mtab will still contain the mounted shares
/proc/mounts does not list the shares
/proc/fs/cifs/DebugData contains:

Display Internal CIFS Data Structures for Debugging
---------------------------------------------------
CIFS Version 1.53
Active VFS Requests: 20
Servers:
entry for 192.168.100.x not fully displayed
        TCP status: 2
        Local Users To Server: 0 SecMode: 0x3 Req On Wire: 0
MIDs:

2) Name: 192.168.100.x Domain: MYDOMAIN Mounts: 0 OS: Windows 5.0
        NOS: Windows 2000 LAN Manager Capability: 0xf3fd
        SMB session status: 1 TCP status: 2
        Local Users To Server: 0 SecMode: 0x3 Req On Wire: 0
MIDs:

3) Name: 192.168.100.x2 Domain: MYDOMAIN Mounts: 0 OS: Windows 5.0
        NOS: Windows 2000 LAN Manager Capability: 0xf3fd
        SMB session status: 1 TCP status: 2
        Local Users To Server: 0 SecMode: 0x3 Req On Wire: 0
MIDs:

Shares:
1) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
2) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
3) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
4) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
5) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
6) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
7) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
8) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
9) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
10) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
11) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
12) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
13) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
14) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
15) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0
16) Uses: 0 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 0 type: 0

[Dan VerWeire (dverweire)]

I have since added a 'sync' statement in my script before mounting and before unmounting the CIFS shares. Haven't had any issues since. So suggestion to anyone else who encounters this may be to sync before unmounting.

[Jaime Frutos Morales (acidborg)]

It sounds like script-related, not a samba bug.