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Fermin Molina

2006-Jan-26 16:52 UTC

[Samba] Samba daemons hang trying to lock locking.tdb

Hi,

A day or so after starting samba, some daemons (diferent forks) begin to
hang. Then, the WinXP clients hang too completely.

When I try to figure out what is happen, I see that smbd daemons hangs
always in a fcntl64() call:

# strace -p 6414
Process 6414 attached - interrupt to quit
fcntl64(14, F_SETLKW64, {type=F_WRLCK, whence=SEEK_SET, start=3684, len=1} 
<unfinished ...>
Process 6414 detached
# 

The file descriptor 14 corresponds to /var/lib/samba/locking.tdb file.
A backtrace using gdb from one stalled daemon:

(gdb) bt
#0  0x00faf402 in __kernel_vsyscall ()
#1  0x003dbd7a in fcntl () from /lib/libc.so.6
#2  0x008e50eb in tdb_set_lock_alarm () from /usr/sbin/smbd
#3  0x008e5307 in tdb_set_lock_alarm () from /usr/sbin/smbd
#4  0x008e5868 in tdb_chainlock () from /usr/sbin/smbd
#5  0x00880da8 in get_share_mode_lock () from /usr/sbin/smbd
#6  0x00881677 in get_delete_on_close_flag () from /usr/sbin/smbd
#7  0x007718fb in reply_trans2 () from /usr/sbin/smbd
#8  0x007906bc in smb_fn_name () from /usr/sbin/smbd
#9  0x007913c4 in process_smb () from /usr/sbin/smbd
#10 0x00791899 in smbd_process () from /usr/sbin/smbd
#11 0x0096c5c0 in main () from /usr/sbin/smbd
(gdb)


A backtrace from another stalled daemon:


(gdb) bt
#0  0x00faf402 in __kernel_vsyscall ()
#1  0x003dbd7a in fcntl () from /lib/libc.so.6
#2  0x008e50eb in tdb_set_lock_alarm () from /usr/sbin/smbd
#3  0x008e5307 in tdb_set_lock_alarm () from /usr/sbin/smbd
#4  0x008e5868 in tdb_chainlock () from /usr/sbin/smbd
#5  0x00880da8 in get_share_mode_lock () from /usr/sbin/smbd
#6  0x0077ab8b in open_file_ntcreate () from /usr/sbin/smbd
#7  0x0074a922 in reply_ntcreate_and_X () from /usr/sbin/smbd
#8  0x007906bc in smb_fn_name () from /usr/sbin/smbd
#9  0x007913c4 in process_smb () from /usr/sbin/smbd
#10 0x00791899 in smbd_process () from /usr/sbin/smbd
#11 0x0096c5c0 in main () from /usr/sbin/smbd
(gdb)       


The number of smbd daemons stalled increases in time.
I'm using FC4 with last updates installed and samba 3.0.21a.

Maybe is a kernel related problem with file locking?

Thanx in advance!

-- 
Fermin Molina Ibarz
T?cnic sistemes - ASIC
Universitat de Lleida
Tel: +34 973 702151
GPG: 0x060F857A

Jeremy Allison

2006-Jan-26 20:24 UTC

head link

[Samba] Samba daemons hang trying to lock locking.tdb

On Wed, Jan 25, 2006 at 04:11:33PM +0100, Fermin Molina
wrote:> Hi,
> 
> A day or so after starting samba, some daemons (diferent forks) begin to
> hang. Then, the WinXP clients hang too completely.
> 
> When I try to figure out what is happen, I see that smbd daemons hangs
> always in a fcntl64() call:
> 
> # strace -p 6414
> Process 6414 attached - interrupt to quit
> fcntl64(14, F_SETLKW64, {type=F_WRLCK, whence=SEEK_SET, start=3684, len=1} 
<unfinished ...>
> Process 6414 detached
> # 
> 
> The file descriptor 14 corresponds to /var/lib/samba/locking.tdb file.
> A backtrace using gdb from one stalled daemon:
Known bug we fixed with 3.0.21a (in fact this was the *reason*
for 3.0.21a... :-).

Jeremy.

Fermin Molina

2006-Jan-27 12:17 UTC

head link

[Samba] Samba daemons hang trying to lock locking.tdb

On Fri, 2006-01-27 at 07:52 +0100, Masopust, Christian
wrote:> Hi,
> 
> I had a similar behaviour on my RHEL 4 system (with the only difference
> that smbds did the fcntl64 to secrets.tdb).
> 
> I changed "machine password timeout = 0" in my smb.conf and the
problem
> had gone away (do you have any messages in your logs pointing out that
> server password could not be changed?) 

With this option set to 0, I think the password is never updated, then,
secrets.tdb file is never used (I read in man.conf(5) that this is only
needed when using security=domain, not my case because I use
security=user).

But in my case, locking.tdb is used a lot (using strace, when the system
works well, I see a lot of fcntl64 calls using the locking.tdb file
descriptor).

Thanx for the answer!

/Fermin


> > -----Original Message-----
> > From: 
> > samba-bounces+christian.masopust=siemens.com@lists.samba.org 
> > [mailto:samba-bounces+christian.masopust=siemens.com@lists.sam
> > ba.org] On Behalf Of Fermin Molina
> > Sent: Thursday, January 26, 2006 11:58 PM
> > To: Jeremy Allison
> > Cc: samba@lists.samba.org
> > Subject: Re: [Samba] Samba daemons hang trying to lock locking.tdb
> > 
> > On Thu, 2006-01-26 at 12:23 -0800, Jeremy Allison wrote:
> > > On Wed, Jan 25, 2006 at 04:11:33PM +0100, Fermin Molina wrote:
> > > > Hi,
> > > > 
> > > > A day or so after starting samba, some daemons (diferent 
> > forks) begin to
> > > > hang. Then, the WinXP clients hang too completely.
> > > > 
> > > > When I try to figure out what is happen, I see that smbd 
> > daemons hangs
> > > > always in a fcntl64() call:
> > > > 
> > > > # strace -p 6414
> > > > Process 6414 attached - interrupt to quit
> > > > fcntl64(14, F_SETLKW64, {type=F_WRLCK, whence=SEEK_SET, 
> > start=3684, len=1}  <unfinished ...>
> > > > Process 6414 detached
> > > > # 
> > > > 
> > > > The file descriptor 14 corresponds to 
> > /var/lib/samba/locking.tdb file.
> > > > A backtrace using gdb from one stalled daemon:
> > > 
> > > Known bug we fixed with 3.0.21a (in fact this was the *reason*
> > > for 3.0.21a... :-).
> > 
> > 
> > Errr... well, please, read at end of my email :-)
> > 
> > -------
> > The number of smbd daemons stalled increases in time.
> > I'm using FC4 with last updates installed and samba 3.0.21a.
> > 
> > Maybe is a kernel related problem with file locking?
> > 
> > Thanx in advance!
> > -------
> > 
> > The fact is that I have installed 3.0.21a samba version. 
> > FC4's RPMs from
> > samba.org web, and I get the same behaviour.
> > 
> > Thanx in advance!
> > 
> > -- 
> > Fermin Molina Ibarz
> > T?cnic sistemes - ASIC
> > Universitat de Lleida
> > Tel: +34 973 702151
> > GPG: 0x060F857A
> > 
> > 
> > -- 
> > To unsubscribe from this list go to the following URL and read the
> > instructions:  https://lists.samba.org/mailman/listinfo/samba
> > -- 
Fermin Molina Ibarz
T?cnic sistemes - ASIC
Universitat de Lleida
Tel: +34 973 702151
GPG: 0x060F857A

Fermin Molina

2006-Jan-31 20:24 UTC

head link

[Samba] Samba daemons hang trying to lock locking.tdb

Hi,

After upgrade to samba 3.0.21b, the behaviour is the same.
I think the problem must be related to TDB (Trivial DB) code. The call
fcntl64() is trying to lock for write the file /var/cache/locking.tdb,
but with the F_SETLKW file control command. This control command waits
if the file is blocked. If another process locks for write this file,
can we get a deadlock?

The fact is that some hours after start samba, some smbd daemons hangs
waiting to get a write lock to locking.tdb file. The windows clients
associated with these smbd daemons get stalled and the user must to
reset the machine (or I kill -9 these daemons).

Any clue?

Thanks in advance.



On Wed, 2006-01-25 at 16:11 +0100, Fermin Molina wrote:> Hi,
> 
> A day or so after starting samba, some daemons (diferent forks) begin to
> hang. Then, the WinXP clients hang too completely.
> 
> When I try to figure out what is happen, I see that smbd daemons hangs
> always in a fcntl64() call:
> 
> # strace -p 6414
> Process 6414 attached - interrupt to quit
> fcntl64(14, F_SETLKW64, {type=F_WRLCK, whence=SEEK_SET, start=3684, len=1} 
<unfinished ...>
> Process 6414 detached
> # 
> 
> The file descriptor 14 corresponds to /var/lib/samba/locking.tdb file.
> A backtrace using gdb from one stalled daemon:
> 
> (gdb) bt
> #0  0x00faf402 in __kernel_vsyscall ()
> #1  0x003dbd7a in fcntl () from /lib/libc.so.6
> #2  0x008e50eb in tdb_set_lock_alarm () from /usr/sbin/smbd
> #3  0x008e5307 in tdb_set_lock_alarm () from /usr/sbin/smbd
> #4  0x008e5868 in tdb_chainlock () from /usr/sbin/smbd
> #5  0x00880da8 in get_share_mode_lock () from /usr/sbin/smbd
> #6  0x00881677 in get_delete_on_close_flag () from /usr/sbin/smbd
> #7  0x007718fb in reply_trans2 () from /usr/sbin/smbd
> #8  0x007906bc in smb_fn_name () from /usr/sbin/smbd
> #9  0x007913c4 in process_smb () from /usr/sbin/smbd
> #10 0x00791899 in smbd_process () from /usr/sbin/smbd
> #11 0x0096c5c0 in main () from /usr/sbin/smbd
> (gdb)
> 
> 
> A backtrace from another stalled daemon:
> 
> 
> (gdb) bt
> #0  0x00faf402 in __kernel_vsyscall ()
> #1  0x003dbd7a in fcntl () from /lib/libc.so.6
> #2  0x008e50eb in tdb_set_lock_alarm () from /usr/sbin/smbd
> #3  0x008e5307 in tdb_set_lock_alarm () from /usr/sbin/smbd
> #4  0x008e5868 in tdb_chainlock () from /usr/sbin/smbd
> #5  0x00880da8 in get_share_mode_lock () from /usr/sbin/smbd
> #6  0x0077ab8b in open_file_ntcreate () from /usr/sbin/smbd
> #7  0x0074a922 in reply_ntcreate_and_X () from /usr/sbin/smbd
> #8  0x007906bc in smb_fn_name () from /usr/sbin/smbd
> #9  0x007913c4 in process_smb () from /usr/sbin/smbd
> #10 0x00791899 in smbd_process () from /usr/sbin/smbd
> #11 0x0096c5c0 in main () from /usr/sbin/smbd
> (gdb)       
> 
> 
> The number of smbd daemons stalled increases in time.
> I'm using FC4 with last updates installed and samba 3.0.21a.
> 
> Maybe is a kernel related problem with file locking?
> 
> Thanx in advance!
> 
> -- 
> Fermin Molina Ibarz
> T?cnic sistemes - ASIC
> Universitat de Lleida
> Tel: +34 973 702151
> GPG: 0x060F857A
> 
> -- 
Fermin Molina Ibarz
T?cnic sistemes - ASIC
Universitat de Lleida
Tel: +34 973 702151
GPG: 0x060F857A

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