[Bug 293118] diff(1): runs almost forever on large files

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 293118] diff(1): runs almost forever on large files"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 11 Feb 2026 17:32:37 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293118

Michael Osipov <michaelo@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |michaelo@FreeBSD.org

--- Comment #1 from Michael Osipov <michaelo@FreeBSD.org> ---
Coming from bug 265320:

Running on:
FreeBSD deblndw013x10v.innomotics.net 16.0-CURRENT FreeBSD 16.0-CURRENT #2
main-n283868-c08ee1eba989: Wed Feb 11 17:56:01 CET 2026    
root@deblndw013x10v.innomotics.net:/usr/obj/root/freebsd-src/amd64.amd64/sys/GENERIC
amd64

* Expand this tar file:
https://people.freebsd.org/~michaelo/pr-265320/TEST-xml.tar.gz
* Let it run: diff -ur TEST-xml-master/ TEST-xml-SUREFIRE-1934/ > /dev/null

It will take almost forever to run

GNU diff is fast here:
# time gdiff -ur  TEST-xml-master/ TEST-xml-SUREFIRE-1934/ > /dev/null

real    0m19.084s
user    0m16.097s
sys     0m2.987s

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