samba - Nov 2019 - "samba-tool backup offline" stuck

On 2019-11-10 21:41, Andrew Bartlett wrote:
> Is this unpatched Samba
Yes and no.
Yes: it's the stock FreeBSD's Samba port.
No: the FreeBSD port has itself several patches WRT the original Samba 
distribution.


> and what is the full backtrace on that tdbbackup?
You mean: compile with debug symbols, attach gdb and get stack trace?
If so, I'll do it, but I'll need some time.


> It looks like tdbbackup cannoto proceed due to outstanding locks held
> by other parts of Samba,
I too guess so.


> however the referece to lockf makes me worried
> that for some reason full fcntl locks are not in use.
I get lost here.
What should I check?



  bye & Thanks
	av.

On Mon, 2019-11-11 at 08:35 +0100, Andrea Venturoli
wrote:
> On 2019-11-10 21:41, Andrew Bartlett wrote:
> 
> > Is this unpatched Samba
> 
> Yes and no.
> Yes: it's the stock FreeBSD's Samba port.
> No: the FreeBSD port has itself several patches WRT the original Samba 
> distribution.
> 
> 
> 
> > and what is the full backtrace on that tdbbackup?
> 
> You mean: compile with debug symbols, attach gdb and get stack trace?
> If so, I'll do it, but I'll need some time.
Yes, that's what I need.

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba

On 2019-11-11 09:41, Andrew Bartlett wrote:
>>> and what is the full backtrace on that tdbbackup?
>>
>> You mean: compile with debug symbols, attach gdb and get stack trace?
>> If so, I'll do it, but I'll need some time.
> 
> Yes, that's what I need.
Please, find it below:

(gdb) bt
#0  0x0000000800fcdab8 in _fcntl () from /lib/libc.so.7
#1  0x0000000800c68908 in __thr_fcntl (fd=3, cmd=13)
     at /usr/src/lib/libthr/thread/thr_syscalls.c:202
#2  0x0000000800ed2127 in fcntl (fd=3, cmd=13) at 
/usr/src/lib/libc/sys/fcntl.c:54
#3  0x000000080082c83c in fcntl_lock (tdb=<optimized out>,
rw=<optimized
out>, off=8,
     len=<optimized out>, waitflag=<optimized out>) at 
../../common/lock.c:58
#4  tdb_brlock (tdb=0x80161f000, rw_type=3, offset=8, len=1, 
flags=<optimized out>)
     at ../../common/lock.c:200
#5  0x000000080082cd19 in tdb_nest_lock (tdb=0x80161f000, offset=8, 
ltype=3,
     flags=TDB_LOCK_WAIT) at ../../common/lock.c:390
#6  0x0000000800831808 in _tdb_transaction_start (tdb=0x80161f000, 
lockflags=TDB_LOCK_WAIT)
     at ../../common/transaction.c:490
#7  0x000000000040188b in backup_tdb (
     old_name=0x7fffffffddd6 "/var/db/samba4/private/secrets.ldb",
     new_name=0x80161c000
"/var/db/samba4/private/secrets.ldb.copy.tdb",
     hash_size=<optimized out>, nolock=<optimized out>, 
readonly=<optimized out>)
     at ../../tools/tdbbackup.c:157
#8  0x0000000000401528 in main (argc=<optimized out>, argv=0x7fffffffdb40)
     at ../../tools/tdbbackup.c:360


Don't know if this is enough, but I'll get more info if needed (just 
tell me which info).

  bye & Thanks
	av.