tree 9762edd647c167f571e2df7dbdedf97faacfb354
parent e6c5474adeca4c9545c4d7e9dee64e5c4f09f40b
author Ruslan Ermilov <ru@nginx.com> 1569242732 +0300
committer Ruslan Ermilov <ru@nginx.com> 1569242732 +0300

HTTP/2: fixed possible alert about left open socket on shutdown.

This could happen when graceful shutdown configured by worker_shutdown_timeout
times out and is then followed by another timeout such as proxy_read_timeout.
In this case, the HEADERS frame is added to the output queue, but attempt to
send it fails (due to c->error forcibly set during graceful shutdown timeout).
This triggers request finalization which attempts to close the stream.  But the
stream cannot be closed because there is a frame in the output queue, and the
connection cannot be finalized.  This leaves the connection open without any
timer events leading to alert.

The fix is to post write event when sending output queue fails on c->error.
That will finalize the connection.