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b=tA78S6gr+Qh7bTbz1ZeQsKn2yGl8q4Zf+nVGht3F99N8vJ/cfaY3BEbh1wNMwik04 6yI4dWNE7oOeGtCS8nDKTWo023FfpA2DYMkTLCkIv2pNSHah+uEDPIdVrQ37UbYhHa PEmBvcA84WFCfGaks4Q6Kk3d796ZNH8pgOvqH3/bZLB/x2gqMu5lY17lL5C+mbbxG0 l+fkHGM4GZfABuGw+vc9NNNnO7Zn6vH+qVtRfH9DEqIMQF0/UAxuZKXiAqcoKofPwq t5jjTTwFiUSnt6w8ox3aYTVelANQ+D9kaLir7yFW1Pta6MLisJFL68Lpv0Cijor3wI xZH0ghAZwUgMQ== Date: Thu, 4 Dec 2025 22:59:10 +0200 From: Mike Rapoport To: Shuah Khan Cc: "David Hildenbrand (Red Hat)" , akpm@linux-foundation.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, masahiroy@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] Revert "mm: fix MAX_FOLIO_ORDER on powerpc configs with hugetlb" Message-ID: References: <20251204023358.54107-1-skhan@linuxfoundation.org> <0b007374-1058-487c-8033-4f0d2830dc89@kernel.org> <78af7da4-d213-42c6-8ca6-c2bdca81f233@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <78af7da4-d213-42c6-8ca6-c2bdca81f233@linuxfoundation.org> X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1FE9E10000C X-Stat-Signature: kdz9f8f1y9y1zmmrerm87pjeoezt6yy4 X-HE-Tag: 1764881959-209636 X-HE-Meta: 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 1t60GvCF TQMHe/716oVRNf90jGsb0eItJNmzYZ6VDwjFk3mEXQmXujmxZzi3OgUM1ZzlPTINd4M47bnaxPy0lUjrP7NOVZi466xKQtdT8v9cfZtJNzXAU8KtyQLU7Y59t7eCxPmtkxa7ykZny6RPbCle0dsKCCvbWjcC7Pwu7HL4ckcY8fh5WfrDy3ZNjYeW4n7+2inrtdYi296KjKXWONSsg/acyRa7647VuusViEVEod/c1cyF4sUm8AUHq6YENZbYmWXcFw7UdzdD/6nkIi3tYZJYYqXZJ143NBUw0IM+EOYkewv/DsJd+4BzPvdF+u6RmqL/PVYWRMoNPQAGKOUc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Dec 04, 2025 at 10:03:09AM -0700, Shuah Khan wrote: > On 12/3/25 23:35, Mike Rapoport wrote: > > On Thu, Dec 04, 2025 at 07:17:06AM +0100, David Hildenbrand (Red Hat) wrote: > > > > > > > > The blow is is one of the git clone failures: > > > > > > > > git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux_6.19 > > > > Cloning into 'linux_6.19'... > > > > remote: Enumerating objects: 11173575, done. > > > > remote: Counting objects: 100% (785/785), done. > > > > remote: Compressing objects: 100% (373/373), done. > > > > remote: Total 11173575 (delta 534), reused 505 (delta 411), pack-reused 11172790 (from 1) > > > > Receiving objects: 100% (11173575/11173575), 3.00 GiB | 7.08 MiB/s, done. > > > > Resolving deltas: 100% (9195212/9195212), done. > > > > fatal: did not receive expected object 0002003e951b5057c16de5a39140abcbf6e44e50 > > > > fatal: fetch-pack: invalid index-pack output > > > > > > If I would have to guess, these symptoms match what we saw between commit > > > adfb6609c680 ("mm/huge_memory: initialise the tags of the huge zero folio") > > > and commit 5bebe8de1926 ("mm/huge_memory: Fix initialization of huge zero folio"). > > > > > > 5bebe8de1926 went into v6.18-rc7. > > > > > > Just to be sure, are you sure we were able to reproduce this issue with a > > > v6.18-rc7 or even v6.18 that contains 5bebe8de1926? > > > > > > Bisecting might give you wrong results, as the problems of adfb6609c680 do not > > > reproduce reliably. > > I can confirm that bisecting gives odd results between v6.18-rc5 and > > v6.18-rc6. I was seeing failures in some tests, bisected a few times and > > got a bunch of bogus commits including 3470715e5c22 ("MAINTAINERS: update > > David Hildenbrand's email address") :) > > I am sure this patch is the cause oh the problems I have seen on my two > systems. Reverting this commit solved issues since this commit does > impact all architectures enabling HAVE_GIGANTIC_FOLIOS if the conditions > are right. The issue reproduces for me with 39231e8d6ba7 reverted as well. If I run git clone in a VM with 2G of ram it becomes unresponsive at about 40% of "Receiving objects" and than git errors out with "invalid index-pack output" -- Sincerely yours, Mike.