Thanks. I'll give strace a try. And it does apear to be really stuck. Theprocess was running a function on a timer once a second that sent datato another process, which stopped receiving updates when this issue occured.On 3 April 2016 08:27 UTC, James Little wrote:> I'd try attaching strace to the pid concerned, to see if it's stuck waiting> on the return of a syscall. Normally you would see regular select> <> calls, corresponding to the file> descriptors/ports the process is listening on.>> If there's nothing useful in the strace output once it gets into this> state, you could try running it with strace from the beginning, with> something like>> nohup strace -s 99999 -o ~/str_out.log q myprog.q 2>&1 > ~/q_out.log <> /dev/null &>> and you may be able to glean something useful in the run-up to the issue.>> If it's not obvious already whether it's _really_ stuck, you could run a> function within kdb on a timer (e.g. log a timestamp to disk), and see if> that continues working. That might help narrow down the issue to the Docker> (i.e. Linux conatainers) networking stack, and/or its signal-handling.>> On 3 April 2016 at 00:48, wrote:>>>>> I'm not sure how to debug this, so looking for suggestions.>>>> I've been running multiple kdb instances inside a docker container.>> On multiple occasions, one of the instances will hang:>>>> - Running hopen on its port from a another kdb process will hang>> indefinitely.>> - Trying to run a HTTP query will also hang until the client times out.>> - I am, however, able to successfully open a connection with telnet.>> - Sending SIGINT/SIGTERM has no effect. SIGKILL is needed to bring down>> the hung process.>> - Other kdb instances in the container are unaffected.>> - Appears to happen randomly, sometimes after 1 hour, sometimes after 2>> days.>>>> Most likely a docker bug, but so far it's only manifested itself with kdb.>>>> -->> You received this message because you are subscribed to the Google Groups>> "Kdb+ Personal Developers" group.>> To unsubscribe from this group and stop receiving emails from it, send an>> email to personal-kdbplus+unsubscribe@googlegroups.com.>> To post to this group, send email to personal-kdbplus@googlegroups.com.>> Visit this group at https://groups.google.com/group/personal-kdbplus.>> For more options, visit https://groups.google.com/d/optout.>>
