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From: Miklos Szeredi <miklos@szeredi.hu>
To: michael+lkml@stapelberg.ch
Cc: fuse-devel <fuse-devel@lists.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Kyle Sanderson <kyle.leet@gmail.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Still a pretty bad time on 5.4.6 with fuse_request_end.
Date: Tue, 11 Feb 2020 11:55:46 +0100
Message-ID: <CAJfpegv4iL=bW3TXP3F9w1z6-LUox8KiBmw7UBcWE-0jiK0YsA@mail.gmail.com> (raw)
In-Reply-To: <20200209080918.1562823-1-michael+lkml@stapelberg.ch>

On Sun, Feb 9, 2020 at 9:09 AM <michael+lkml@stapelberg.ch> wrote:
>
> From: Michael Stapelberg <michael+lkml@stapelberg.ch>
>
> Hey,
>
> I recently ran into this, too. The symptom for me is that processes using the
> affected FUSE file system hang indefinitely, sync(2) system calls hang
> indefinitely, and even triggering an abort via echo 1 >
> /sys/fs/fuse/connections/*/abort does not get the file system unstuck (there is
> always 1 request still pending). Only removing power will get the machine
> unstuck.
>
> I’m triggering this when building packages for https://distr1.org/, which uses a
> FUSE daemon (written in Go using the jacobsa/fuse package) to provide package
> contents.
>
> I bisected the issue to commit
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b319d1f6f92a4ced9897678113d176ee16ae85d
>
> With that commit, I run into a kernel oops within ≈1 minute after starting my
> batch build. With the commit before, I can batch build for many minutes without
> issues.

Pretty weird.   I'm not seeing how this could change behavior, as the
args->end value is not changed after being initialized, and so moving
the test later should not make a difference.

Could you print out the complete contents of req->args?

Thanks,
Miklos

  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-05  1:15 Kyle Sanderson
2020-01-05  8:08 ` Greg KH
2020-01-16 11:06 ` Miklos Szeredi
2020-02-09  8:09   ` michael+lkml
2020-02-11 10:55     ` Miklos Szeredi [this message]
2020-02-12  7:58       ` Michael Stapelberg
2020-02-12  8:34         ` Miklos Szeredi
2020-02-12  9:38           ` Michael Stapelberg
2020-02-12 19:36             ` Miklos Szeredi
2020-02-13  7:23               ` Michael Stapelberg
2020-03-10 18:07               ` Vivek Goyal
2020-02-22 19:29 Kyle Sanderson
2020-02-23  9:58 ` Greg KH
2020-03-06  9:31 Bruno Thomsen
2020-03-09 19:03 ` Greg KH

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