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Luca Marceglia

2020-May-11 13:52 UTC

[Samba] Clients send tons of Notiftication requests

Hi everybody!

I have a QNAP at home running firmware 4.4.2.1273 and I have configured it
with NFS (for my iMac and FireTV) and SMB access (standalone server, for
Win10 and iPhone/iPad Files access)

Everything went fine till a certain point where many application would crash
or behave in a very strange way when accessing SAMBA shares. Application can
be Explorer++, OneCommander or File.app from my iPhone.

 

What I saw, after a long debugging session, is that these apps send tons of
Change Notifications requests

smbd_smb2_notify_send: notify change called on ., filter
FILE_NAME|DIR_NAME|ATTRIBUTES|CREATION|SECURITY|STREAM_SIZE|STREAM_WRITE,
recursive = 0
[2020/05/01 01:32:03.255113, 3]
../source3/smbd/smb2_notify.c:253(smbd_smb2_notify_send)

They send around 34 requests per second and the server replies to all of
them. This creates lots of issues (some programs hang, other crashes, others
show flashing folders). The default behaviour for the server is to wait for
1 minute before answering back, but this is not happening.
What I did was changing the /etc/smb.conf and added

change notify = no

So that the samba server will just ignore those changes. This also means
that if there is a file change, I may not see it unless I manually refresh
the directory tree.
After I restarted samba, I could succesfully use OneCommander, and also
Files.

Windows Explorer does not use this kind of notifications, so this is why it
always worked.

 

Of course, I do not believe this is the best solution but I cannot
understand what (from the server side) would trigger a client to start
sending so many notification requests. I am writing this because I was
already using Files and OneCommander and everything was working fine. Being
the client the same, something must've happened on the server side.

 

In the QNAP I did a modification in the shared folders: I ran convmv to
change from UTF8 NFC to UTF8 NFD and, apparently, after this I started to
have some troubles. I moved back to NFC but the problem still persists. I do
not know if this has anything to do; it may also be that I restarted the
QNAP and some configurations that I committed in the past were executed,
though my smb.conf file looks pretty simple.

 

Any ideas on why this is happening and therefore how to go back to
normality? This is driving me really crazy.

 

Current samba version is the following

 

smbd (samba daemon) Version 4.7.12

smbd (samba daemon) is running.

max protocol SMB 3 enabled.

 

My configuration is the following:

 

[global]

passdb backend = smbpasswd

workgroup = HOME

security = USER

server string = NAS

encrypt passwords = Yes

username level = 0

map to guest = Never

null passwords = yes

max log size = 100

socket options = TCP_NODELAY SO_KEEPALIVE

os level = 20

preferred master = no

dns proxy = No

smb passwd file=/etc/config/smbpasswd

username map = /etc/config/smbusers

guest account = guest

directory mask = 0777

create mask = 0777

oplocks = yes

locking = yes

disable spoolss = no

load printers = yes

veto files = /.AppleDB/.AppleDouble/.AppleDesktop/:2eDS_Store/Network Trash
Folder/Temporary
Items/TheVolumeSettingsFolder/. at __thumb/. at __desc/:2e*/. at __qini/.Qsync/.
at uplo
ad_cache/.qsync/.qsync_sn/. at qsys/.streams/.digest/

delete veto files = yes

map archive = no

map system = no

map hidden = no

map read only = no

deadtime = 10

restrict anonymous = 2

server role = auto

use sendfile = yes

unix extensions = no

store dos attributes = yes

client ntlmv2 auth = yes

dos filetime resolution = no

follow symlinks = yes

wide links = yes

force unknown acl user = yes

template homedir = /share/homes/DOMAIN=%D/%U

inherit acls = no

domain logons = no

min receivefile size = 256

case sensitive = auto

domain master = auto

local master = no

enhance acl v1 = yes

remove everyone = no

conn log = yes

kernel oplocks = no

min protocol = SMB2_02

smb2 leases = yes

durable handles = yes

kernel share modes = no

posix locking = no

lock directory = /share/CACHEDEV1_DATA/.samba/lock

state directory = /share/CACHEDEV1_DATA/.samba/state

cache directory = /share/CACHEDEV1_DATA/.samba/cache

printcap cache time = 0

acl allow execute always = yes

server signing = disabled

streams_depot:delete_lost = yes

streams_depot:check_valid = no

fruit:nfs_aces = no

fruit:veto_appledouble = no

winbind expand groups = 1

winbind scan trusted domains = no

pid directory = /var/lock

printcap name = /etc/printcap

printing = cups

show add printer wizard = no

invalid users = guest

dos charset = ISO8859-1

host msdfs = yes

winbind max clients = 2000

winbind max domain connections = 10

log level = 0

log file = /var/log/samba/%m.log

wins support = no

change notify = no

winbind enum groups = Yes

winbind enum users = Yes

vfs objects =  shadow_copy2 catia fruit qnap_macea streams_depot

[printers]

use client driver = yes

writable = no

browsable = no

printable = yes

guest ok = yes

path = /var/spool/smb

 

[Web]

comment = System default share

path = /share/CACHEDEV1_DATA/Web

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest","kodi"

read list = @"nas"

write list = "admin","luca"

valid users =
"root","admin","luca",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/Web/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/Web

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:01:30:19:29:42:65

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[Public]

comment = System default share

path = /share/CACHEDEV1_DATA/Public

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest"

read list = @"everyone",@"nas","_qnap_support"

write list = "luca"

valid users =
"root",@"everyone","luca",@"nas","_qnap_support"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/Public/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/Public

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:01:30:19:29:43:42

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[MotionEyeOS]

comment 
path = /share/CACHEDEV1_DATA/MotionEyeOS

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest","kodi"

read list = @"nas"

write list = @"administrators","admin","luca"

valid users =
"root",@"administrators","admin","luca",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/MotionEyeOS/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/MotionEyeOS

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:04:16:01:56:02

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[FILM]

comment 
path = /share/CACHEDEV1_DATA/FILM

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest"

read list = @"everyone",@"nas"

write list =
@"administrators","admin","kodi","luca"

valid users
"root",@"administrators","admin","kodi","luca",@"everyone",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/FILM/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/FILM

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:04:16:22:37:65

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[iMac]

comment 
path = /share/CACHEDEV1_DATA/iMac

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest"

read list = "kodi",@"everyone",@"nas"

write list =
@"administrators","admin","luca","jenny"

valid users
"root",@"administrators","admin","luca","jenny","kodi",@"everyone",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/iMac/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/iMac

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:04:16:51:58:63

strict allocate = yes

streams_depot:check_valid = yes

mangled names = no

hide unreadable = no

access based share enum = no

 

[Raspberry]

comment 
path = /share/CACHEDEV1_DATA/Raspberry

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest"

read list = @"nas"

write list = @"administrators","admin","luca"

valid users =
"root",@"administrators","admin","luca",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/Raspberry/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/Raspberry

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:04:17:25:58:93

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[Multimedia]

comment = System default share

path = /share/CACHEDEV1_DATA/Multimedia

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest","jenny"

read list = @"everyone"

write list = "admin"

valid users = "root",@"everyone","admin"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/Multimedia/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/Multimedia

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:08:19:15:46:36

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

[Download]

comment = System default share

path = /share/CACHEDEV1_DATA/Download

browsable = yes

oplocks = yes

ftp write only = no

recycle bin = yes

recycle bin administrators only = no

qbox = no

timemachine = no

public = yes

invalid users = "guest"

read list = @"nas"

write list = "admin"

valid users = "root","admin",@"nas"

inherit permissions = yes

shadow:showprevious = yes

shadow:snapdir = /share/CACHEDEV1_DATA/_.share/Download/.snapshot

shadow:basedir = /share/CACHEDEV1_DATA/Download

shadow:sort = desc

shadow:format = @GMT-%Y.%m.%d-%H:%M:%S

smb encrypt = disabled

create time = 2020:02:08:19:15:54:56

strict allocate = yes

streams_depot:check_valid = yes

mangled names = yes

hide unreadable = no

access based share enum = no

 

Thanks!

Luca

Rowland penny

2020-May-11 14:33 UTC

head link

[Samba] Clients send tons of Notiftication requests

On 11/05/2020 14:52, Luca Marceglia via samba wrote:> Hi everybody!
>
> I have a QNAP at home running firmware 4.4.2.1273 and I have configured it
> with NFS (for my iMac and FireTV) and SMB access (standalone server, for
> Win10 and iPhone/iPad Files access)
>
> Everything went fine till a certain point where many application would
crash
> or behave in a very strange way when accessing SAMBA shares. Application
can
> be Explorer++, OneCommander or File.app from my iPhone.
>
>   
>
> What I saw, after a long debugging session, is that these apps send tons of
> Change Notifications requests
>
> smbd_smb2_notify_send: notify change called on ., filter >
FILE_NAME|DIR_NAME|ATTRIBUTES|CREATION|SECURITY|STREAM_SIZE|STREAM_WRITE,
> recursive = 0
> [2020/05/01 01:32:03.255113, 3]
> ../source3/smbd/smb2_notify.c:253(smbd_smb2_notify_send)
>I think you are going to have to ask QNAP about this, that is coming 
from this block of code:

 ??? if (DEBUGLEVEL >= 3) {
 ??? ??? char *filter_string;

 ??? ??? filter_string = notify_filter_string(NULL, in_completion_filter);
 ??? ??? if (tevent_req_nomem(filter_string, req)) {
 ??? ??? ??? return tevent_req_post(req, ev);
 ??? ??? }

 ??? ??? DEBUG(3,("smbd_smb2_notify_send: notify change "
 ??? ??? ??? ?"called on %s, filter = %s, recursive = %d\n",
 ??? ??? ??? ?fsp_str_dbg(fsp), filter_string, recursive));

 ??? ??? TALLOC_FREE(filter_string);
 ??? }

For Samba to print the message, you would need 'log level = 3' (or 
higher), you have 'log level = 0'

QNAP uses its own version of Samba, so it is possible they have changed 
the code above, or your QNAP is using an old version of Samba.

Rowland

Rowland penny

2020-May-11 15:04 UTC

head link

[Samba] Clients send tons of Notiftication requests

On 11/05/2020 15:38, Luca Marceglia wrote:> Well,
> The log below actually came from a log level set to 3, but then I reverted
it back to 0 as I did not want to keep debugging my SMB connection.
Then leave it at '0' and you will not see the messages ;-)

I do not think that the messages have anything to do with your real 
problem, which seems to be coming from your clients. Has anything 
changed on the clients ? is there anything in their logs ?

Rowland

Luca Marceglia

2020-May-11 15:11 UTC

head link

[Samba] Clients send tons of Notiftication requests

I think I could not make myself understood.
Since I could not connect with my samba share and the programs were looping
or crashing, I decided to activate the logs on the samba server and set it
to 3.
I then started to see all these notification requests.
So what I understand is that the clients are sending tons of these
notification requests to the server. This was not happening before.
I do not have specific client log because Windows10 apps do not store so
many logs and File.app on the iPhone may write logs somewhere but I don't
know how to get them.
Anyway I captured packets with Wireshark and got the logs from the samba
server and I see that the problem is triggered by this mechanism.
If I tell the samba server not to respond to these notifications, everything
works fine.

My question is why the clients started sending such requests? And how can I
stop them from doing so? It's not a Windows problem because Apple apps have
the same issue, so I believe this is a server issue...

-----Original Message-----
From: samba <samba-bounces at lists.samba.org> On Behalf Of Rowland penny
via
samba
Sent: luned? 11 maggio 2020 17:04
To: sambalist <samba at lists.samba.org>
Subject: Re: [Samba] Clients send tons of Notiftication requests

On 11/05/2020 15:38, Luca Marceglia wrote:> Well,
> The log below actually came from a log level set to 3, but then I revertedit back to 0 as I did not want to keep debugging my SMB connection.

Then leave it at '0' and you will not see the messages ;-)

I do not think that the messages have anything to do with your real problem,
which seems to be coming from your clients. Has anything changed on the
clients ? is there anything in their logs ?

Rowland



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