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Created attachment 1690547 [details]
Proposed patch

The bug was found during solving https://bugzilla.redhat.com/show_bug.cgi?id=1689207 .

It was found out that httpAddrConnect2() now sets errno EINPROGRESS when it tries to connect to a device which is turned off/network is down/ or when any 'device unreachable' scenarios.

It influences ipp and socket backends, which don't catch EINPROGRESS -> contimeout is not applied, resulting into the backend is running with a job till the job is cancelled manually.

Reported upstream here https://github.com/apple/cups/pull/5782

The fix will set 2 different errnos now:

1) ETIMEDOUT when remaining time in httpAddrConnect2() is reached
2) EHOSTDOWN when all addresses are tried and there are no open file descriptors

This will make backends to apply contimeout and the job will be retried/aborted (according print queue error policy) and queue disabled in the future.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: cups security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:4469