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I am running Ubuntu 12.04. When I close bitcoin-qt (or any of its derivatives, like litecoin-qt or dogecoin-qt), sometimes it does not completely exit. I then have to run killall -9 bitcoin-qt, or sometimes when even that doesn't work, killall -9 bitcoin-shutoff (apparently the client calls a bitcoin-shutoff process to shut itself down). I am wondering if there is a fix for this, to prevent the client from refusing to close in the future.
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Have you set a proxy?
From my experience slow shutdown seems to have to do with slow proxies (for example, Tor). There is an issue for this: https://github.com/bitcoin/bitcoin/issues/2954
If it is not the network thread that hangs, but database synchronization, then killing with -9 can be dangerous.
I'd suggest debugging this by running in gdb, Ctrl-Cing when it hangs, and then getting backtraces for every still-running thread.
No, no proxies. – Tony – 2014-03-17T18:34:14.590
When you check your processes - does it appear as zombie? Does it respond to plain "kill" or remains unresponsive unless you go with "kill -9"? – Joe Pineda – 2014-03-19T17:13:55.653
It does not respond to kill, only kill -9. – Tony – 2014-03-19T22:47:22.563
you need to post debug log, so we can understand what's up with client – rustylife – 2014-08-31T12:05:22.577