>>>>> On Mon, 30 Jul 2007 19:27:43 +0200, Kern Sibbald said:
>
> On Monday 30 July 2007 19:16, Martin Simmons wrote:
> > >>>>> On Mon, 30 Jul 2007 16:48:09 +0200, Kern Sibbald said:
> > >
> > > On Sunday 29 July 2007 19:28, Ryan Novosielski wrote:
> > > > Hi all,
> > > >
> > > > Ever since I added the TapeAlert/smartmonctl command to my tape drive,
> > > > it appears as if I get a fairly regular crash of that bacula-sd. I know
> > > > there is a case where Bacula and the utility can go for the tape drive
> > > > at the same time and cause problems, but I don't think Bacula should go
> > > > KABOOM when this happens.
> > >
> > > The traceback, unfortunately, doesn't demangle the C++ subroutine names
> nor
> > > provide source line numbers, but the best that I can tell is that the
> > > heap
> > > has been corrupted, Bacula detects is, then does a Kaboom (self inflicted
> seg
> > > fault).
> >
> > I think there is a bug in bnet_thread_server that causes the Kaboom.
> >
> > The dlist sockfds contains the fd_ptr objects, which are allocated with
> > alloca. The problem is that the dlist destructor will deallocate them using
> > free (i.e. sm_free). You can see this in the backtrace, where the argument
> to
> > sm_free is a pointer into the stack (0xffbff028).
>
> Oh, that is cute and clever of you to figure out. I'll *certainly* take a
> look at it.
>
> I've never seen such a crash so it must only normally happen on shutdown. Do
> you have any idea what is triggering the code that fails in this case?
Right, I can't see any normal way for the main loop of bnet_thread_server to
exit in the SD.
Something I've wondered occasionally though: is it guaranteed that the use of
errno in code like this will give the error generated by select?
if ((stat = select(maxfd + 1, &sockset, NULL, NULL, NULL)) < 0) {
berrno be; /* capture errno */
if (errno == EINTR)...
I.e. could the berrno constructor (poolmem, smartalloc etc) change errno?
__Martin
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