Dear Maksym,
These kind of errors should never happen, but when this happen, this can
come from NaviServer or Tcl or some C modules/package loaded.
The last time i saw this kind of crash in a NaviServer environment, it
was triggered from Tcl, where a select() was tried in a situation where
more than 1024 file descriptors were open (stay away from async Tcl I/O
operations and use NaviServer built-in features ... e.g. ns_http instead
of tcllib http). The number of open file descriptors of NaviServer can
be monitored e.g. by the munin-plugins [2,3].
To debug this situation,
- make sure to compile Tcl and NaviServer with debugging symbols (i.e.
with compiler flag "-g" [1]),
- make sure, core dumps are enabled, and when you have a core,
- use "gdb /usr/local/ns/bin/nsd YOURCORE" to see exactly, where this
happened.
all the best
-g
[1] https://openacs.org/forums/message-view?message_id=5537675
[2] https://github.com/gustafn/munin-plugins-ns
[3]
https://openacs.org/munin/localdomain/localhost.localdomain/naviserver_openacs_lsof.html
On 04.11.21 21:17, Maksym Zinchenko wrote:
Hi every now and then my server crashes with the last message in the
log file *** Buffer overflow detected *** I would really appreciate if
someone can point me in the right direction of debugging and figure
out what's going on.
Thank you
Maksym Zinchenko
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