linux-kernel - Re: 6.12 WARNING in netfs_consume_read

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Message-ID: <CAKPOu+-h2B0mw0k_XiHJ1u69draDLTLqJhRmr3ksk2-ozzXiTg@mail.gmail.com>
Date: Sun, 8 Dec 2024 11:20:36 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: David Howells <dhowells@...hat.com>
Cc: Jeff Layton <jlayton@...nel.org>, netfs@...ts.linux.dev, 
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: 6.12 WARNING in netfs_consume_read_data()

On Sat, Dec 7, 2024 at 7:39 PM Max Kellermann <max.kellermann@...os.com> wrote:
> Here's a Brotli-compressed trace (of 6.12.3 +
> dhowells/netfs-writeback). I can reproduce it this way:
>
> 1. log in via SSH (cm4all-lukko is our SSH server)
> 2. "cp" a file on the Ceph home directory
> 3. log out - bash hangs inside write():

Today, I took the time to bisect it, and the bisect arrived at
first-bad commit 796a4049640b54cb1daf9e7fe543292c5ca02c74 ("netfs: In
readahead, put the folio refs as soon extracted").