Hi!
Since my workplace updated their file share from Windows server 2003
to 2012, I'm getting frequent hangs of utilities trying to access the
share. I have two shares mounted (from the same server):
//<servername>/data /i cifs credentials=/etc/cifspass,uid=1000 0 0
//<servername>/user/<username> /j cifs credentials=/etc/cifspass,uid=1000 0 0
Sometimes, I can't access either of them. Sometimes I can access one
but not the other. "Can't access" means any userspace tool I'm trying
to use to access e.g. /j hangs. This also affects tab completion in
zsh, vim, etc. (I think because they try to access / which also hangs
because of my unorthodox mountpoints).
When this happens, I see this in my dmesg:
INFO: task ls:11158 blocked for more than 120 seconds.
Tainted: G O 3.16.0-4-amd64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
ls D ffff8800c570cff8 0 11158 9390 0x00000004
ffff8800c570cba0 0000000000000082 0000000000012f00 ffff88031e997fd8
0000000000012f00 ffff8800c570cba0 ffff88031de74420 ffff88031e997b70
ffff88031de74424 ffff8800c570cba0 00000000ffffffff ffff88031de74428
Call Trace:
[<ffffffff8150e225>] ? schedule_preempt_disabled+0x25/0x70
[<ffffffff8150fcd3>] ? __mutex_lock_slowpath+0xd3/0x1c0
[<ffffffff8150fddb>] ? mutex_lock+0x1b/0x2a
[<ffffffffa0655dd3>] ? cifs_reconnect_tcon+0x153/0x2e0 [cifs]
[<ffffffff810a7624>] ? __wake_up+0x34/0x50
[<ffffffffa0655ff5>] ? smb_init+0x25/0x80 [cifs]
[<ffffffffa065be3c>] ? CIFSSMBQPathInfo+0x5c/0x260 [cifs]
[<ffffffffa067ef53>] ? cifs_query_path_info+0x63/0x180 [cifs]
[<ffffffff811b2ea1>] ? link_path_walk+0x71/0x8c0
[<ffffffff811b1dca>] ? lookup_fast+0xaa/0x2b0
[<ffffffffa0671360>] ? cifs_get_inode_info+0x230/0x6c0 [cifs]
[<ffffffffa0666e3e>] ? build_path_from_dentry+0xae/0x290 [cifs]
[<ffffffffa0673198>] ? cifs_revalidate_dentry_attr+0xf8/0x1c0 [cifs]
[<ffffffff810eb57e>] ? from_kgid_munged+0xe/0x20
[<ffffffff811ace3a>] ? cp_new_stat+0x13a/0x160
[<ffffffffa067330f>] ? cifs_getattr+0x4f/0x120 [cifs]
[<ffffffff811ac9f7>] ? vfs_fstatat+0x57/0x90
[<ffffffff811acebd>] ? SYSC_newlstat+0x1d/0x40
[<ffffffff8151164d>] ? system_call_fast_compare_end+0x10/0x15
This is on a Debian Jessie, with a 3.16.0-4-amd64 kernel and
mount.cifs 6.4.
The contents of /proc/fs/cifs/DebugData:
Display Internal CIFS Data Structures for Debugging
---------------------------------------------------
CIFS Version 2.03
Features: dfs fscache lanman posix spnego xattr acl
Active VFS Requests: 5
Servers:
1) entry for <ip> not fully displayed
TCP status: 4
Local Users To Server: 1 SecMode: 0x3 Req On Wire: 1
Shares:
1) \\<servername>\data Mounts: 1 Type: NTFS DevInfo: 0x60020 Attributes: 0xc700ff
PathComponentMax: 255 Status: 0x1 type: DISK DISCONNECTED
MIDs:
State: 2 com: 114 pid: 11094 cbdata: ffff8800c640a2d0 mid 30
2) entry for <ip> not fully displayed
TCP status: 1
Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0
Shares:
1) \\<servername>\user Mounts: 1 Type: NTFS DevInfo: 0x60020 Attributes: 0xc700ff
PathComponentMax: 255 Status: 0x1 type: DISK
MIDs:
After a process hung for ~10 minutes, it seems some kind of timeout
happened. One of the shares got unmounted (without anything in dmesg),
the process continued, and it's not listed in DebugData anymore.
With Windows Server 2003 this worked like a charm, and I don't see any
problems when accessing the share from Windows 7.
If there's any other information you need, please let me know!
Thanks,
Florian
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