From: Paul Eggert <eggert@cs.ucla.edu>
To: "Ludovic Courtès" <ludo@gnu.org>, 21460@debbugs.gnu.org
Cc: bug-guix@gnu.org
Subject: bug#21460: Race condition in tests/tail-2/assert.sh
Date: Fri, 11 Sep 2015 10:18:36 -0700 [thread overview]
Message-ID: <55F30CEC.7060102@cs.ucla.edu> (raw)
In-Reply-To: <87wpvw2ad8.fsf@gnu.org>
Ludovic Courtès wrote:
> I think the problem happens when ‘tail’ opens ‘foo’ right in between of
> the two notifications: ‘foo’ is still there, and so ‘tail’ doesn’t
> report anything.
>
> Does that make sense?
Yes, though if the link count is indeed zero, I'm surprised that 'tail' can open
the file -- that sounds like a bug in the kernel.
If there is such a kernel bug and 'tail' can open a file with a link count of
zero, that would explain why 'tail' does not immediately receive an
IN_DELETE_SELF notification: after all, the file is open (by 'tail' itself) so
it should not be deleted even if it has a link count of zero. If so, it appears
that there's another kernel bug later: when 'tail' closes the file's last file
descriptor, the file should be deleted and an IN_DELETE_SELF notification should
be sent to 'tail'.
next prev parent reply other threads:[~2015-09-11 17:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 16:23 bug#21459: Race condition in tests/tail-2/assert.sh Ludovic Courtès
2015-09-11 17:18 ` Paul Eggert [this message]
2015-09-11 20:55 ` bug#21460: " Ludovic Courtès
2015-09-11 22:49 ` Pádraig Brady
2015-09-11 23:48 ` Pádraig Brady
2015-09-12 1:09 ` Paul Eggert
2015-09-12 2:22 ` Pádraig Brady
2015-10-02 15:50 ` Pádraig Brady
2015-09-11 20:34 ` bug#21459: " Pádraig Brady
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