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Tue, 12 May 2026 00:35:50 -0700 (PDT) Received: from [192.168.1.211] ([185.19.1.47]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e9053f690sm28632005e9.7.2026.05.12.00.35.49 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 May 2026 00:35:49 -0700 (PDT) Content-Type: multipart/mixed; boundary="------------scR6AWr0IUd80RR4fMrzjkil" Message-ID: <6ae85515-9373-4c9e-90d2-5e4176590c5b@suse.com> Date: Tue, 12 May 2026 09:35:49 +0200 Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US From: Daniel Mach Subject: git clone fails when using --dissociate together with a reference repository that contains a commit-graph Autocrypt: addr=dmach@suse.de; keydata= xsFNBGGI+38BEADBDja8QlZm3MGurxy7mndgveeqpYu2iTwYmTSOFiHK4EBpCz3aCoKdD7e3 9fnwsyCsLuFLYJEPXOJaqyovznJmaCu5WOmT2VaHj6KtLkEtOmUD/P7vviRsND3RjvKkZDTI gtisVCOXAMfyai6rKTtIMxYouzxb8ChblkygwAkbGA7Dw/CBb6UTloNel1qbDToBGBeLS7zN f+nX4vDAceFriFDiwFA/QKIaKdmUPIGR8k+YYBvBI/JdUHjniGErpLNTFPszNLcSy11/ovrq 48So1p3PsqL1TDFeA1Se2vphsJbKxYd1vz4ypFlAwKngOFsnYF3MfMTVyGfIFSuELhOO101Q qrJfffhX5ecKmY+DHvGAiCeL4dMdOfnTWvmdQphJ1c2WynAdi3bL4sBKAOnsyEiqNE27v6I+ nuB9PnPPKUwVm1dgQB/0YRHD1y1GFBVN8V6EzMI3A0rBEiu935w2ZRvtJy9Z7eYOIO5WhcyU wegJrerbeO3TWQBOb/Rz9yt05qND+WQeWM4lAfwhpui4ioYRsy9vJvD8/kk7njbu3ZEAniSC Y9LxFv6LV5FYjjUvAao3s7yRtbPAd23vp5JMCTxNKWrOOsCF4lGCzIxc6BfTCiwFo9jaNYEn FkfApRG34ob+AGGcaL2bw5KuABXAIm+AyE4OWt9Uf5Z09C/PWwARAQABzRtEYW5pZWwgTWFj aCA8ZG1hY2hAc3VzZS5kZT7CwZMEEwEKAD0WIQSAmr/zaSS742TNP1RnrHnsL99EuQUCYYlH sgIbAwUJCWYBgAULCQgHAwQVCgkIBRYDAgEAAh4BAheAAAoJEGeseewv30S5jWUQAKJSg8S4 PvIiSxbORiy/jdM/IYgPwm7CyGJndtMcZq3Fj0cRvzBBO0l6LZPHaD1kM5OrXoBSDeU7upnM s9leaQt8ScX04MS3wdAOoHJmmG066uRHBzzEQ+SySY5ibXVZ9HWrVZRXr8+f/bAf8yIxylpU 39q+2vtxIAQa9NZKEud8rrzE9CBlOK+1yPVbm5Uk8IxPmmdi89l57LYVhKqFw9Y7iAJQXoRT Sg+o1p50FfwaxZRlVOkGLzpo+z2Eiuotkwqdoh1IOKE2v6TAF4mizLR0skBJqOoPwqWLDAs7 gI3Un/q9aM0fxMWfuVRR+Jnnbc6/iKh1lNn4Diq+3dwBtai9vZ2jBvcqixqoQFXmdYF46+Aw 2T8FApccDB7SylgiL7L0BYuDdh98i38ML83Yn8HiHSXtHwfQCHCE7ihOudtx78UdomcWbI51 PQN9P4vXs2ZS2WQ1NHrzuE3c+NfXuW/Wuj73g7pIP92px+xqjyDd0odShQjdR8RQSnLgLm/7 JfahckjRB9OfYZ4z8WtoteezVVb/ITqO7rOYrdQ1NWCyRqQcrRJ3RVO8oj/zlDRq2B3b3Yff TYYywFPUpROA8KIPEdKIDj/+hyLAzNtJJZvrKYsjzxQT3E2Lv0U7UfWdwfNT9e+MaNZ1NcpI Y+QtJEEFelzmIETWBTYCdyo0ev+/zsFNBGGI+38BEAC0/C86GAqABEG0CB6idJsY1SHRxCN6 JMCDeowPJ8odDtZpfx9qMMWWWMj/wyuoL3+HoALTrwwDyP4dwZ3HUO9n8o8lJsEKOJ5WrQwI uDDS3tc8O2BG3r6DP9eaajMU5WTEecxbEJINT6YBvp51AQrzBnWvihhZHbkwP6jLhhYxFy/G MHjRGnftQs/KfMFtxbQQpT1XNCYIj0APVXsKnNiMInq82SqDB89cblcnf+PDhEUG04nV6x4e QRmXm/3PzZFAeZMzBUotbF7tmbz/hIafkoglLqjc0FHszagy51EM3/zKmYvgeNOutgbFSKyD BipDRJrlu+jBMs++bGcquPcYdbp2E2wWjL4exPl55u6UBJrKTtdO4+F3sU0uK5exyaWxKzyC 3E0/fLNS5wOyDJIxKt8DZZAe2iULdVFFtYitUri0Ury7NkMYrUV9FL2zTcid4o1pK89KDQTX 73tn9QLPWQlQ6UF1Y6MceH0u/+z17TUAFxYd7iLeZZi+00t9TP7FyLjRXFFTUYGyVnDWEFOO f1Yy2sCloWXMGvR6WiJ2+IjnRfnMKeIsN0iQhFrMq5R4YPA6sJq7a8/4BhGVyVHgHsJJ09cB TcP6aFqyJdgV9t9K3XcW8JbeY1EVl1TNEzESMpDGVAY3CYNwmIHGqRSgaKT060gXnK4BLQti vtjqVwARAQABwsF8BBgBCgAmFiEEgJq/82kku+NkzT9UZ6x57C/fRLkFAmGI+38CGwwFCQlm AYAACgkQZ6x57C/fRLkuQRAAj2w0PnN7andLcyldwBBZRgcVwjz5ol5N3wt4Gg+zFMK6xDDR lD/iSPxN9egAGHKh+IcXYejgb0S+csJKgPavNGBZ81QZxNnYmFa7HMrz3GoMJ86SR/NJIpGH tmCpeZ0YjXt1vmPzaKwwG34y/pQIhfLPl6zRXagiw5h8br2oAi9KO//+gDl8fwl/GKtA073D Dslz0c5DSCh1YAIlmcjYvCTHmpqCKdoUn1hXoeTuqcmqnq8MWpL97Sd6WIt6aK0ODIKLESX5 DicglpDwIGR3qsEALXNg2aoHqQsEtPN52EJN1mOH5tx0XSDSQvWDZ4Yi3oZxgint1LfCeTP2 e9mX3B+eq57SXmxrlshmm2AmX3hAkzeNiNP4L48tmCdXHwTF7ZnIRWDELN2usCjFJL9kNH2m K6Gn9moYWfGk+cBM8Os4aJ2WgO8ljS+jQ1gHTWKd6YdV9cRsjqocNDo/mfZiJmTgTwo05BdL HzcaU5B8WL18UrSEH/LDVFrn64BCwNkvaoYR33KQIdxx0nY7OvtrcjCbt+kNdGfxRp4BGAjr SGAV3MW5LVbGVB+7jBwDPN1jUdUTNtliALVU4FqvOlAxaLVAEJ2jcF8m3E1BsBuADkSnbSt1 XawqflgE6ObBNiq3yCFa2AN6NTVD+C9oenUaauqdGd8Lh+lHaCzceDfD+Go= To: git@vger.kernel.org This is a multi-part message in MIME format. --------------scR6AWr0IUd80RR4fMrzjkil Content-Type: multipart/alternative; boundary="------------02OjlxH0FfQwap19xwjB00Im" --------------02OjlxH0FfQwap19xwjB00Im Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi, I've stumbled upon a bug that the following command failed: $ git clone --reference --dissociate fatal: unable to parse commit warning: Clone succeeded, but checkout failed. You can inspect what was checked out with 'git status' and retry with 'git restore --source=HEAD :/' Omitting --dissociate fixed the error, but it wasn't clear to me what might be the root cause. $ git --version git version 2.54.0 With the help of AI I was able to create a reproducer (see the attached script). I have verified that the reproducer works and also simplified it. AI generated report (take it with a grain of salt): * The Bug: During dissociation, Git correctly repacks objects and removes the objects/info/alternates file. However, the git clone process has already initialized its object store including the alternate's commit-graph.   After dissociation, it fails to "forget" or reload the object store, leading to a crash when it tries to use the commit-graph (which refers to the now-unlinked alternate) to perform the initial checkout. * Proof of state: As shown in the script output, a manual git checkout immediately after the failure succeeds, proving the repository is structurally sound but the clone process itself was in an inconsistent state. * Workaround: Passing -c core.commitGraph=false to the clone command prevents the crash. regards, Daniel --------------02OjlxH0FfQwap19xwjB00Im Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi,

I've stumbled upon a bug that the following command failed:

$ git clone <url> <dir> --reference <old-dir> --dissociate
fatal: unable to parse commit <SHA>
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Omitting --dissociate fixed the error, but it wasn't clear to me what might be the root cause.

$ git --version  
git version 2.54.0

With the help of AI I was able to create a reproducer (see the attached script).
I have verified that the reproducer works and also simplified it.

AI generated report (take it with a grain of salt):
* The Bug: During dissociation, Git correctly repacks objects and removes the objects/info/alternates file. However, the git clone process has already initialized its object store including the alternate's commit-graph.
  After dissociation, it fails to "forget" or reload the object store, leading to a crash when it tries to use the commit-graph (which refers to the now-unlinked alternate) to perform the initial checkout.
* Proof of state: As shown in the script output, a manual git checkout immediately after the failure succeeds, proving the repository is structurally sound but the clone process itself was in an inconsistent state.
* Workaround: Passing -c core.commitGraph=false to the clone command prevents the crash.

regards,
Daniel


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