Traffic Server threads will spin under heavy load
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Key: TS-440
URL: https://issues.apache.org/jira/browse/TS-440
Project: Traffic Server
Issue Type: Bug
Components: Network
Reporter: Bryan Call
This has been a problem for a long time. I created a fix for the problem
yesterday and tested it overnight.
The problem is when we remove from the enabled lists in
close_UnixNetVConnection(). We lock the lists when we add to them, but not
when we remove the connection from them in close_UnixNetVConnection(). This
can corrupt the data structure.
Because the data structure is corrupted it can fail the empty() test in
NetHandler::mainNetEvent() and poll_timeout (really epoll timeout) will set to
0 and the thread will spin.
The read enabled list (Queue<>) will normally have a NULL head, but a non-NULL
tail and the empty() test on the Queue<> checks for NULL head and NULL tail to
be considered empty.
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