linux-kernel - Re: Bug#645366: [fuse-devel] Hang and suspend failure after FUSE server killed (3.1-rc7)

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Date:	Mon, 17 Oct 2011 15:31:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>, 645366@...s.debian.org
Cc:	fuse-devel@...ts.sourceforge.net,
	"brian m. carlson" <sandals@...stytoothpaste.net>, rjw@...k.pl,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Bug#645366: [fuse-devel] Hang and suspend failure after FUSE
 server killed (3.1-rc7)

On Mon, 2011-10-17 at 16:22 +0200, Miklos Szeredi wrote:
> Ben Hutchings <ben@...adent.org.uk> writes:
> 
> > On Fri, 2011-10-14 at 22:52 +0000, brian m. carlson wrote:
> >> Package: linux-2.6
> >> Version: 3.1.0~rc7-1~experimental.1
> >> Severity: normal
> >> 
> >> This morning I was backing up my laptop to another computer via sshfs
> >> (and fuse).  The afio archiver was writing to this sshfs-mounted
> >> location.  I decided to abort the operation with Ctrl-C, which caused
> >> the sshfs mount to become unmounted; however, afio was apparently not
> >> affected by the SIGINT (probably because processes in disk IO are
> >> unkillable).
> >> 
> >> Several hours later, I attempted to suspend my computer and it failed to
> >> do so. The kernel log (attached) indicated that the afio process from
> >> hours before was preventing the suspend.  Since processes waiting on
> >> disk IO are unkillable (IMO a bug) and the underlying device to which
> >> afio was writing was long gone, I was forced to reboot the machine in
> >> order to get it to suspend.  If I had not noticed that the machine had
> >> failed to suspend, it could have stayed running in my bag and seriously
> >> overheated.
> >
> > This seems to be a bug in FUSE.  Is this known about?  If not, could
> > someone look into this?
> 
> It's a bug in the fuse-freezer interaction.  Yes, it is known.
[...]

But the FUSE server was already killed; shouldn't that cause outstanding
requests to fail immediately?

Ben.

-- 
Ben Hutchings
No political challenge can be met by shopping. - George Monbiot

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