From: Greg KH <greg@kroah.com>
To: Tuomas Tynkkynen <tuomas@tuxera.com>
Cc: stable@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH stable backport] net/9p: Switch to wait_event_killable()
Date: Tue, 28 Nov 2017 09:40:46 +0100 [thread overview]
Message-ID: <20171128084046.GE9413@kroah.com> (raw)
In-Reply-To: <20171127234450.27217-1-tuomas@tuxera.com>
On Tue, Nov 28, 2017 at 01:44:50AM +0200, Tuomas Tynkkynen wrote:
> commit 9523feac272ccad2ad8186ba4fcc89103754de52 upstream, with changes
> to net/9p/trans_xen.c dropped as that driver was only added in 4.12.
>
> Because userspace gets Very Unhappy when calls like stat() and execve()
> return -EINTR on 9p filesystem mounts. For instance, when bash is
> looking in PATH for things to execute and some SIGCHLD interrupts
> stat(), bash can throw a spurious 'command not found' since it doesn't
> retry the stat().
>
> In practice, hitting the problem is rare and needs a really
> slow/bogged down 9p server.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---
> This backport applies to stable trees for 4.9 and below.
Thanks, now applied.
greg k-h
prev parent reply other threads:[~2017-11-28 8:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 23:44 [PATCH stable backport] net/9p: Switch to wait_event_killable() Tuomas Tynkkynen
2017-11-28 8:40 ` Greg KH [this message]
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