Re: [Monotone-devel] Repeatable 'monotone serve' crash

[Timothy Brownawell]

On Thu, 2007-01-04 at 23:20 -0500, Ethan Blanton wrote:
> When serving the monotone database at:
> 
> http://www.cs.purdue.edu/homes/eblanton/private/ical.mtn
> 
> Using the config file:
> 
> http://www.cs.purdue.edu/homes/eblanton/private/ical.monotonerc
> 
> ... the monotone server crashes on a pull of 'net.elitists.ical' into
> an empty database.  I can repeat this reliably by doing:
> 
> mtn -d new.mtn db init
> mtn -d new.mtn pull nestor.cs.purdue.edu net.elitists.ical
> 
> ... from any monotone 0.32 (maybe other versions, don't have one
> handy) client.  Both monotone 0.30 and 0.32 as the server display this
> behavior.  I have attached the crash dump left by monotone when this
> happens.  The server is being started via usher, if that is relevant.

The error is
   netsync.cc:1,223: 'I(! del().empty() || ident == base)'
.

gdb tells me that the destination file is da39... , ie, the empty file.

IIRC an xdelta consists of copy+insert instructions; to delete
everything you leave the xdelta empty.

An empty xdelta is not the same as an xdelta that does nothing. The
invariant is based on a wrong assumption, and should be removed.


-- 
Timothy

Free (experimental) public monotone hosting: http://mtn-host.prjek.net