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From: "gprocida at google dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/26646] unexpected declaration-only types
Date: Wed, 08 Jun 2022 15:43:12 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26646

--- Comment #35 from gprocida at google dot com ---
I have bisected what I believe to be a (rare) exponential slowdown to this
commit:
https://sourceware.org/git/?p=3Dlibabigail.git;a=3Dcommit;h=3Dbfd557040376d=
4e82e4e684f3745f1e55bafdd9b

The same pairs of DIEs get compared 100 000s of times (at least) and abidw =
does
not terminate in any reasonable amount of time.

This behaviour is consistent across build environments and compilers and I =
have
verified it on vanilla upstream libabigail at commit
ebf8f98f3dc7b6e4fe2af9c1ccbbfee55ace6c54.

The test case is 200MB compressed, unfortunately, much of which is vmlinux.=
 The
bad behaviour kicks in when processing reaches a certain kernel module, as =
far
as I could tell using strace.

I'm looking into what I can do make the test case available to you. There m=
ay
be some complications here.

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