linux-kernel - Re: [dm-devel] [PATCH v5] fault-injection: introduce kvmalloc fallback options

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Message-ID: <20180427082555.GC17484@dhcp22.suse.cz>
Date:   Fri, 27 Apr 2018 10:25:55 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        John Stoffel <john@...ffel.org>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Michal@...ffel.org, eric.dumazet@...il.com, netdev@...r.kernel.org,
        jasowang@...hat.com, Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        linux-mm@...ck.org, dm-devel@...hat.com,
        Vlastimil Babka <vbabka@...e.cz>, Andrew@...ffel.org,
        David Rientjes <rientjes@...gle.com>,
        Morton <akpm@...ux-foundation.org>,
        virtualization@...ts.linux-foundation.org,
        David Miller <davem@...emloft.net>, edumazet@...gle.com
Subject: Re: [dm-devel] [PATCH v5] fault-injection: introduce kvmalloc
 fallback options

On Thu 26-04-18 18:52:05, Mikulas Patocka wrote:
> 
> 
> On Fri, 27 Apr 2018, Michael S. Tsirkin wrote:
[...]
> >    But assuming it's important to control this kind of
> >    fault injection to be controlled from
> >    a dedicated menuconfig option, why not the rest of
> >    faults?
> 
> The injected faults cause damage to the user, so there's no point to 
> enable them by default. vmalloc fallback should not cause any damage 
> (assuming that the code is correctly written).

But you want to find those bugs which would BUG_ON easier, so there is a
risk of harm IIUC and this is not much different than other fault
injecting paths.
-- 
Michal Hocko
SUSE Labs