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Sun, 28 Sep 2025 02:28:16 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AlRs-DKaMj37 Date: Sun, 28 Sep 2025 02:27:46 -0400 From: "Chris Murphy" To: "Btrfs BTRFS" , "Linux Devel" Message-Id: <00c4be20-09c8-417e-bbae-e966200d87b9@app.fastmail.com> In-Reply-To: References: Subject: Re: [BUG] 6.17.0, mount: /mnt/0: fsconfig() failed: File exists. Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sun, Sep 28, 2025, at 1:53 AM, Chris Murphy wrote: > Downstream bug includes full dmesg attached: > https://bugzilla.redhat.com/show_bug.cgi?id=2399959 OK so this is a case of two devices with the same fsid. I simply forgot I had plugged in the original device planning to wipe it - its replacement is a new fs using metadata_uuid, with the original fsid. But the two identical fsid's is the source of all this confusion, both user and I think the kernel is also confused. I've added more details to the downstream bug report, including strace. -- Chris Murphy