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Fri, 9 Aug 2024 03:40:03 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Fri, 09 Aug 2024 09:39:41 +0200 From: "Morten Hein Tiljeset" To: "Christian Brauner" Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Message-Id: In-Reply-To: <20240808-kontinental-knauf-d119d211067e@brauner> References: <22578d44-b822-40ff-87fb-e50b961fab15@app.fastmail.com> <20240808-hangar-jobverlust-2235f6ef0ccb@brauner> <20240808-kontinental-knauf-d119d211067e@brauner> Subject: Re: Debugging stuck mount Content-Type: text/plain Content-Transfer-Encoding: 7bit > The file descriptor could already be closed but the task could be stuck > exiting and so queued task work including destroying files wouldn't be > done yet. You could also try and see if you can figure out what tasks > require your workload to do a lazy umount in the first place. That might > bring you closer to the root cause. > > What kernel version are you running anyway? That's an interesting idea about the stuck task, I'll try looking into that. We're not doing lazy unmounts on purpose -- I'm only concluding that it must be happening based on the mount namespace being NULL. I wonder if the lazy unmount could happen implicitly as a consequence of some other operation? I'm on kernel 6.1.53 and I've also experienced the problem on the 5.15.x series.