From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Miroslav Benes <mbenes@suse.cz>,
Greg KH <gregkh@linuxfoundation.org>,
Luis Chamberlain <mcgrof@kernel.org>,
mbenes@suse.com, Minchan Kim <minchan@kernel.org>,
keescook@chromium.org, dhowells@redhat.com, hch@infradead.org,
ngupta@vflare.org, sergey.senozhatsky.work@gmail.com,
axboe@kernel.dk, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, live-patching@vger.kernel.org,
Jessica Yu <jeyu@kernel.org>
Subject: Re: [PATCH 1/2] zram: fix crashes due to use of cpu hotplug multistate
Date: Wed, 7 Apr 2021 18:48:03 +0200 [thread overview]
Message-ID: <YG3iQ82gYkcp4G5Q@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210407153031.m4gg3rsgwlr432ba@treble>
On Wed, Apr 07, 2021 at 10:30:31AM -0500, Josh Poimboeuf wrote:
> On Wed, Apr 07, 2021 at 04:09:44PM +0200, Peter Zijlstra wrote:
> > On Tue, Apr 06, 2021 at 10:54:23AM -0500, Josh Poimboeuf wrote:
> >
> > > Same for Red Hat. Unloading livepatch modules seems to work fine, but
> > > isn't officially supported.
> > >
> > > That said, if rmmod is just considered a development aid, and we're
> > > going to be ignoring bugs, we should make it official with a new
> > > TAINT_RMMOD.
> >
> > Another option would be to have live-patch modules leak a module
> > reference by default, except when some debug sysctl is set or something.
> > Then only those LP modules loaded while the sysctl is set to 'YOLO' can
> > be unloaded.
>
> The issue is broader than just live patching.
>
> My suggestion was that if we aren't going to fix bugs in kernel module
> unloading, then unloading modules shouldn't be supported, and should
> taint the kernel.
Hold up, what? However much I dislike modules (and that is lots), if you
don't want to support rmmod, you have to leak a reference to self in
init. Barring that you get to fix any and all unload bugs.
next prev parent reply other threads:[~2021-04-07 16:49 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-06 2:20 [PATCH 0/2] zram: fix few ltp zram02.sh crashes Luis Chamberlain
2021-03-06 2:20 ` [PATCH 1/2] zram: fix crashes due to use of cpu hotplug multistate Luis Chamberlain
2021-03-09 2:55 ` Minchan Kim
2021-03-10 13:11 ` Luis Chamberlain
2021-03-10 21:25 ` Luis Chamberlain
2021-03-12 2:08 ` Minchan Kim
2021-03-10 21:21 ` Luis Chamberlain
2021-03-12 2:14 ` Minchan Kim
2021-03-12 18:32 ` Luis Chamberlain
2021-03-12 19:28 ` Minchan Kim
2021-03-19 19:09 ` Luis Chamberlain
2021-03-22 16:37 ` Minchan Kim
2021-03-22 20:41 ` Luis Chamberlain
2021-03-22 22:12 ` Minchan Kim
2021-04-01 23:59 ` Luis Chamberlain
2021-04-02 7:54 ` Greg KH
2021-04-02 18:30 ` Luis Chamberlain
2021-04-03 6:13 ` Greg KH
[not found] ` <20210406003152.GZ4332@42.do-not-panic.com>
2021-04-06 12:00 ` Miroslav Benes
2021-04-06 15:54 ` Josh Poimboeuf
2021-04-07 14:09 ` Peter Zijlstra
2021-04-07 15:30 ` Josh Poimboeuf
2021-04-07 16:48 ` Peter Zijlstra [this message]
2021-04-07 20:17 ` Josh Poimboeuf
2021-04-08 6:18 ` Greg KH
2021-04-08 13:16 ` Steven Rostedt
2021-04-08 13:37 ` Josh Poimboeuf
2021-04-08 1:37 ` Thomas Gleixner
2021-04-08 6:16 ` Greg KH
2021-04-08 8:01 ` Jiri Kosina
2021-04-08 8:09 ` Greg KH
2021-04-08 8:35 ` Jiri Kosina
2021-04-08 8:55 ` Greg KH
2021-04-08 18:40 ` Luis Chamberlain
2021-04-09 3:01 ` Kees Cook
2021-04-05 17:07 ` Minchan Kim
2021-04-05 19:00 ` Luis Chamberlain
2021-04-05 19:58 ` Minchan Kim
2021-04-06 0:29 ` Luis Chamberlain
2021-04-07 1:23 ` Minchan Kim
2021-04-07 1:38 ` Minchan Kim
2021-04-07 14:52 ` Luis Chamberlain
2021-04-07 14:50 ` Luis Chamberlain
2021-03-06 2:20 ` [PATCH 2/2] zram: fix races of sysfs attribute removal and usage Luis Chamberlain
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