crash in connections_fetch_entry when yielding connection after share deleted ...

[Jeremy Allison]

On Wed, May 23, 2012 at 08:11:38PM -0700, Richard Sharpe wrote:
> On Wed, May 23, 2012 at 3:38 PM, Richard Sharpe
> <realrichardsharpe at gmail.com> wrote:
> > Hi folks,
> >
> > I have the following panic in one of our logs:
> >
> > [2012/05/23 11:27:05.271238,  1] smbd/service.c:1248(close_cnum)
> >  10.250.201.175 (10.250.201.175) closed connection to service (null)
> > [2012/05/23 11:27:05.300076,  0] lib/fault.c:46(fault_report)
> >  ===============================================================
> > [2012/05/23 11:27:05.300146,  0] lib/fault.c:47(fault_report)
> >  INTERNAL ERROR: Signal 11 in pid 29753 (3.5.15-ACL-FIX)
> >  Please read the Trouble-Shooting section of the Samba3-HOWTO
> > [2012/05/23 11:27:05.300209,  0] lib/fault.c:49(fault_report)
> >
> >  From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
> > [2012/05/23 11:27:05.300267,  0] lib/fault.c:50(fault_report)
> >  ===============================================================
> > [2012/05/23 11:27:05.300308,  0] lib/util.c:1468(smb_panic)
> >  PANIC (pid 29753): internal error
> > [2012/05/23 11:27:05.352921,  0] lib/util.c:1572(log_stack_trace)
> >  BACKTRACE: 25 stack frames:
> >   #0 smbd(log_stack_trace+0x1c) [0x2af1c4fedcc1]
> >   #1 smbd(smb_panic+0xa5) [0x2af1c4feda9c]
> >   #2 smbd [0x2af1c4fd29ea]
> >   #3 smbd [0x2af1c4fd29fd]
> >   #4 /lib64/libc.so.6 [0x2af1c8aaf2d0]
> >   #5 smbd(rep_strlcpy+0x29) [0x2af1c4f9aa7f]
> >   #6 smbd(connections_fetch_entry+0x94) [0x2af1c5003629]
> >   #7 smbd(yield_connection+0xbc) [0x2af1c4c0b276]
> >   #8 smbd(close_cnum+0x220) [0x2af1c4cc6cc1]
> >   #9 smbd(conn_close_all+0x53) [0x2af1c4c17bc4]
> >
> > The code in lib/conn_tdb.c:connections_fetch_record is getting passed
> > NULL (as shown above in the debug line about closed connection to
> > service (null), It is crashing here:
> >
> >        strlcpy(ckey.name, name, sizeof(ckey.name));
> >
> > because name is NULL.

Can you get a stack backtrace when this happens so we know
how we can get in this state ?

Jeremy.