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Re: stranded svnserve processes?

From: Kylo Ginsberg <kylo.ginsberg_at_gmail.com>
Date: 2007-06-28 16:58:08 CEST

Good call. Sample backtrace below; of the 6 I checked all had identical
backtrace, although the repository paths in frame 2 varied somewhat (that
is, they weren't identical, but they were all in the same area; this could
reflect something about the repo or it could correlate with one particular
user (or set of users) tools).

I didn't see this in the Issue Tracker on tigris. Should this thread move
to the dev list?

Kylo

(gdb) bt
#0 0x0000003ba230b1a0 in __read_nocancel () from /lib64/libpthread.so.0
#1 0x00002aaaab28dfde in apr_file_read (thefile=0x5163d8, buf=0x524468,
    nbytes=0x7fffffa35c28) at readwrite.c:124
#2 0x00002aaaab03ee17 in readbuf_input (conn=0x524448,
    data=0x524468 "( success ( ) ) ( ) ) false ) ) t/trunk/omneon/shared )
) areader ) ) ) omneon/panther ) ", len=0x7fffffa35c28)
    at subversion/libsvn_ra_svn/marshal.c:255
#3 0x00002aaaab03eedd in readbuf_fill (conn=0x524448, pool=Variable "pool"
is not available.
)
    at subversion/libsvn_ra_svn/marshal.c:274
#4 0x00002aaaab03ef8b in readbuf_getchar (conn=0x524448, pool=Variable
"pool" is not available.
)
    at subversion/libsvn_ra_svn/marshal.c:284
#5 0x00002aaaab03efbe in readbuf_getchar_skip_whitespace (conn=0x524448,
    pool=0x5364b8, result=0x7fffffa35c9f "")
    at subversion/libsvn_ra_svn/marshal.c:294
#6 0x00002aaaab03fa3d in svn_ra_svn_read_item (conn=0x524448,
pool=0x5364b8,
    item=0x7fffffa35ce8) at subversion/libsvn_ra_svn/marshal.c:621
#7 0x00002aaaab040088 in svn_ra_svn_read_tuple (conn=Variable "conn" is not
available.
)
    at subversion/libsvn_ra_svn/marshal.c:741
#8 0x00002aaaab040558 in svn_ra_svn_handle_commands (conn=0x524448,
pool=Variable "pool" is not available.
)
    at subversion/libsvn_ra_svn/marshal.c:831
#9 0x0000000000409987 in serve (conn=0x524448, params=0x7fffffa35f70,
    pool=0x5161c8) at subversion/svnserve/serve.c:2291
#10 0x00000000004048af in main (argc=4, argv=0x7fffffa36118)
    at subversion/svnserve/main.c:491

On 6/26/07, Ulrich Eckhardt <eckhardt@satorlaser.com> wrote:
>
> On Tuesday 26 June 2007 20:10, Kylo Ginsberg wrote:
> > I'm running svnserve from xinetd and I see a slow accumulation of
> > stranded svnserve processes (a half dozen a day or so). This becomes a
> > problem because I have xinetd's cps (connections per second) set to
> > drop connections if there are 100 in a second, so once enough of these
> > build up (e.g. 60 this morning), the normal fluctuations of svn usage
> > end up causing peaks that hit the cps threshold and then users are
> > getting "svn: connection closed unexpectedly".
> >
> > I've tried reproducing this but it's not as simple as just Ctrl-C'ing
> > a client during a lengthy operation. In any event, any suggestion on
> > how to handle this?
>
> Sounds like a bug in svnserve. Once it detects that its input is at EOF,
> it
> should terminate. I'd suggest that you 'gdb svnserve' and then at the gdb
> prompt 'attach' to one of the hanging svnserves. Then you can at least get
> a
> backtrace so developers can tell where it is hanging.
> Also, I believe that xinetd can log the PIDs of started servers, thus you
> might be able to make out which operation was performed and from where.
>
> Uli
>
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Received on Thu Jun 28 16:58:42 2007

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