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From: "amerey at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug debuginfod/27917] protect against federation loops
Date: Fri, 25 Jun 2021 18:59:21 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27917

Aaron Merey <amerey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amerey at redhat dot com

--- Comment #1 from Aaron Merey <amerey at redhat dot com> ---
Commit ab38d167c40c99 causes federation loops for non-existent resources to
result in multiple temporary livelocks, each lasting for $DEBUGINFOD_TIMEOUT
seconds. Since concurrent requests for each unique resource are now seriali=
zed,
federation loops can result in one server thread waiting to acquire a lock
while the server thread holding the lock waits for the first thread to resp=
ond
to an http request.

An implementation for this PR should help protect against this behaviour. E=
x.
if --forwarded-ttl-limit=3D0 then the timeout behaviour of local loops shou=
ld be
avoided.

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