[Samba] frequent core dumps (invalid lock_order?)

[Rowland Penny]

On Fri, 6 Jan 2017 22:28:11 -0600
Sergei Gerasenko via samba <samba at lists.samba.org> wrote:

> Hi,
> 
> I'm hoping somebody can point me in the right direction. My samba
> version is samba-4.2.10-6.2.el7_2.x86_64. I have lots of daily core
> dumps (~20 on each machine daily) and I have no clear idea why. I'm
> including the stack trace below. It looks like the problem is related
> to "invalid lock_order". Any ideas?
> 
> Thanks,
>   Sergei
> 
> #0  0x00007fc5a34945f7 in raise () from /lib64/libc.so.6
> #1  0x00007fc5a3495ce8 in abort () from /lib64/libc.so.6
> #2  0x00007fc5a4e009db in dump_core ()
> at ../source3/lib/dumpcore.c:337 #3  0x00007fc5a4df31f7 in
> smb_panic_s3 (why=<optimized out>) at ../source3/lib/util.c:811
> #4  0x00007fc5a6c7791f in smb_panic (why=why at entry=0x7fc5a1920401
> "*invalid lock_order*") at ../lib/util/fault.c:166
> #5  0x00007fc5a191b81d in dbwrap_check_lock_order
> (mem_ctx=0x7fc5a893aaa0, db=0x7fc5a894eb20)
>     at ../lib/dbwrap/dbwrap.c:186
> #6  dbwrap_fetch_locked_internal (db=db at entry=0x7fc5a894eb20,
> mem_ctx=mem_ctx at entry=0x7fc5a893aaa0, key=...,
>     db_fn=<optimized out>) at ../lib/dbwrap/dbwrap.c:216
> #7  0x00007fc5a191ba48 in dbwrap_fetch_locked
> (db=db at entry=0x7fc5a894eb20, mem_ctx=mem_ctx at entry=0x7fc5a893aaa0,
>     key=...) at ../lib/dbwrap/dbwrap.c:235
> #8  0x00007fc58d962855 in acl_tdb_lock (id=0x7ffd4d922300,
> db=0x7fc5a894eb20, mem_ctx=0x7fc5a893aaa0)
>     at ../source3/modules/vfs_acl_tdb.c:106
> #9  acl_tdb_delete (db=db at entry=0x7fc5a894eb20,
> psbuf=psbuf at entry=0x7fc5a895df68,
> handle=0x7fc5a8945100)
>     at ../source3/modules/vfs_acl_tdb.c:122
> #10 0x00007fc58d962fe3 in unlink_acl_tdb (handle=0x7fc5a8945100,
> smb_fname=<optimized out>)
>     at ../source3/modules/vfs_acl_tdb.c:269
> #11 0x00007fc58d759802 in smb_full_audit_unlink
> (handle=0x7fc5a895c2c0, smb_fname=0x7fc5a896ed90)
>     at ../source3/modules/vfs_full_audit.c:1333
> #12 0x00007fc5a683540c in close_remove_share_mode
> (close_type=NORMAL_CLOSE, fsp=0x7fc5a896e3c0)
>     at ../source3/smbd/close.c:440
> #13 close_normal_file (close_type=NORMAL_CLOSE, fsp=0x7fc5a896e3c0,
> req=0x7fc5a893e330)
>     at ../source3/smbd/close.c:747
> #14 close_file (req=req at entry=0x7fc5a893e330,
> fsp=fsp at entry=0x7fc5a896e3c0,
> close_type=close_type at entry=NORMAL_CLOSE)
> at ../source3/smbd/close.c:1220 #15 0x00007fc5a6869f75 in
> smbd_smb2_close (req=req at entry=0x7fc5a893dc50,
> fsp=fsp at entry=0x7fc5a896e3c0 ...

Can you post your smb.conf and raise your loglevel to 10 and post the
relevant logs (probably to dropbox or similar)

Rowland