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[tor-bugs] #23356 [Obfuscation/Snowflake]: proxy-go starts using 100% CPU when network is disconnected
#23356: proxy-go starts using 100% CPU when network is disconnected
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Reporter: dcf | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Normal | Keywords:
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
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A power outage disconnected the network of a laptop on which I was running
proxy-go. The laptop battery kept the computer running until the power
came back on, but the network was still down. When I checked on it, the
log was filled with 2.4 GB of
{{{
2017/08/29 10:02:33 error polling broker: Post https://snowflake-
reg.appspot.com/proxy: dial tcp: lookup snowflake-reg.appspot.com on <dns
server>:53: dial udp <dns server>:53: connect: network is unreachable
2017/08/29 10:02:33 error polling broker: Post https://snowflake-
reg.appspot.com/proxy: dial tcp: lookup snowflake-reg.appspot.com on <dns
server>:53: dial udp <dns server>:53: connect: network is unreachable
2017/08/29 10:02:33 error polling broker: Post https://snowflake-
reg.appspot.com/proxy: dial tcp: lookup snowflake-reg.appspot.com on <dns
server>:53: dial udp <dns server>:53: connect: network is unreachable
}}}
There were 11,879,088 of these messages over the course of about an hour
(according to the log timestamps), so about 3,330 messages per second. I'm
guessing the code was in a tight failure loop.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23356>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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