Am 26.03.15 um 13:11 schrieb David Osborne:
Hi Gustaf,
The crashes we are seeing are not during shutdown, but during normal
server operation which is why we are concerned about them. The system
recovers quickly due to daemontools, but the scheduled tasks running
at the time of the crash are aborted.
can you check, what thread was shutting down (in your backtrace:
0x7f585181dda0)
what value for connsperthread are you using?
There is nothing in the syslog to indicate a memory problem or oom
killer being invoked.
As for a Tcl bug, we might potentially be able to upgrade the version
of Tcl use to 8.5.17 from the Debian testing distribution (currently
we use 8.5.11). But I wouldn't like to do that on the production
system unless there was very good reason.
there is no change regarding to this problem in the Tcl 8.5.* family
Do you know more about the Tcl bug that caused your last crash?
I have to dig this out. The problem was with the memory management of
tcl-objs,
where appending to a tcl-obj could lead to overshoot the capabilities of
the length field.
This was fixed in tcl 8.6 and tcl 8.5 (at least 8.5.15). If you were hit
by this
bug, the backtrace would look very differently.
-g
On 26 March 2015 at 11:18, Gustaf Neumann <neum...@wu.ac.at
<mailto:neum...@wu.ac.at>> wrote:
Hi David,
We have this issue of shutdown in test-cases and during server
shutdown since
several years. It is annoying, but mostly harmless. The last time
i looked into
the problem, i got the impression that it depends on a not fully
predictable
shutdown order, which is not completely in our hands due to tcl
interactions.
i would be alert, if you see this problem in other situations. For
our production
system, i saw the last crash months ago (happend due to a Tcl-bug
with
doubling the size of a dstring over 2gb). Another "crash" on a
different system
turned out to be due to linux's oom killer.
-g
--
Univ.Prof. Dr. Gustaf Neumann
WU Vienna
Institute of Information Systems and New Media
Welthandelsplatz 1, A-1020 Vienna, Austria
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