From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: VFS deadlock ?
Date: Thu, 21 Mar 2013 16:36:39 -0400 [thread overview]
Message-ID: <20130321203639.GC16406@redhat.com> (raw)
In-Reply-To: <CA+55aFwyK4uDgSKUpXBGS5zi16qd8STtrGi3kndunYi40dnj+A@mail.gmail.com>
On Thu, Mar 21, 2013 at 01:32:45PM -0700, Linus Torvalds wrote:
> On Thu, Mar 21, 2013 at 1:26 PM, Dave Jones <davej@redhat.com> wrote:
> >
> > those are qstr's, so I used d_name.name, right ?
>
> Yup. And if you want to, you could do p1->d_parent->d_name.name too,
> just to make things obvious. It's technically racy, but by the time
> the bug happens, who cares?
I'll add that next time around if the current run doesn't turn up anything interesting.
> > I'd be surprised actually, I've got sysfs excluded from its list of victim files,
> > due to unrelated issues still unresolved. So unless it followed a symlink into
> > sys from somewhere in /proc or /dev...
> >
> > It took a few hours to reproduce last time, I'll increase the number of child
> > processes to see if I can trigger it faster now that I have the debug stuff in there.
>
> Hmm, ok. Do you have any network mounts or fuse or other "odd"
> filesystems etc? The whole "aliased inodes" thing might come from
> something like that.
at some point during the fuzz run, this happened..
Mar 20 15:20:41 kernel: [ 7578.784674] fuse init (API version 7.21)
Mar 20 15:20:41 systemd[1]: Mounting FUSE Control File System...
Mar 20 15:20:41 systemd[1]: Mounted FUSE Control File System.
I guess something wandered into /dev/fuse and did something. Not sure why
systemd reacted though...
Dave
next prev parent reply other threads:[~2013-03-21 20:36 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-21 19:06 VFS deadlock ? Dave Jones
2013-03-21 19:21 ` Al Viro
2013-03-21 20:31 ` Dave Jones
2013-03-21 19:29 ` Al Viro
2013-03-21 20:15 ` Linus Torvalds
2013-03-21 20:26 ` Dave Jones
2013-03-21 20:32 ` Linus Torvalds
2013-03-21 20:36 ` Dave Jones [this message]
2013-03-21 20:47 ` Al Viro
2013-03-21 21:02 ` Dave Jones
2013-03-21 21:18 ` Linus Torvalds
2013-03-21 21:26 ` Al Viro
2013-03-21 21:41 ` Dave Jones
2013-03-21 21:47 ` Linus Torvalds
2013-03-21 21:55 ` Al Viro
2013-03-21 21:57 ` Linus Torvalds
2013-03-21 22:03 ` Al Viro
2013-03-21 21:52 ` Al Viro
2013-03-21 22:12 ` Dave Jones
2013-03-21 22:29 ` Dave Jones
2013-03-21 22:53 ` Linus Torvalds
2013-03-21 23:07 ` Dave Jones
2013-03-21 23:36 ` Al Viro
2013-03-21 23:58 ` Linus Torvalds
2013-03-22 0:01 ` Linus Torvalds
2013-03-22 0:12 ` Al Viro
2013-03-22 0:20 ` Al Viro
2013-03-22 0:22 ` Linus Torvalds
2013-03-22 1:22 ` Al Viro
2013-03-22 1:33 ` Linus Torvalds
2013-03-22 1:40 ` Al Viro
2013-03-22 4:37 ` [CFT] " Al Viro
2013-03-22 4:55 ` Linus Torvalds
2013-03-22 5:18 ` Al Viro
2013-03-22 5:33 ` Linus Torvalds
2013-03-22 6:09 ` Al Viro
2013-03-22 6:22 ` Al Viro
2013-03-22 16:23 ` Dave Jones
2013-03-22 19:43 ` Linus Torvalds
2013-03-22 21:28 ` Al Viro
2013-03-22 22:57 ` Eric W. Biederman
2013-03-22 5:19 ` Linus Torvalds
2013-03-22 0:08 ` Al Viro
2013-03-22 0:15 ` Linus Torvalds
2013-03-22 0:19 ` Linus Torvalds
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