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Message-ID: <alpine.LSU.2.20.1801291917130.15985@n3.vanv.qr>
Date: Mon, 29 Jan 2018 19:24:01 +0100 (CET)
From: Jan Engelhardt <jengelh@...i.de>
To: Florian Westphal <fw@...len.de>
cc: "Kirill A. Shutemov" <kirill@...temov.name>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
davem@...emloft.net, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, netdev@...r.kernel.org,
aarcange@...hat.com, yang.s@...baba-inc.com, mhocko@...e.com,
syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org,
mingo@...nel.org, linux-mm@...ck.org, rientjes@...gle.com,
akpm@...ux-foundation.org, guro@...com,
kirill.shutemov@...ux.intel.com
Subject: Re: [netfilter-core] kernel panic: Out of memory and no killable
processes... (2)
On Monday 2018-01-29 17:57, Florian Westphal wrote:
>> > > vmalloc() once became killable by commit 5d17a73a2ebeb8d1 ("vmalloc: back
>> > > off when the current task is killed") but then became unkillable by commit
>> > > b8c8a338f75e052d ("Revert "vmalloc: back off when the current task is
>> > > killed""). Therefore, we can't handle this problem from MM side.
>> > > Please consider adding some limit from networking side.
>> >
>> > I don't know what "some limit" would be. I would prefer if there was
>> > a way to supress OOM Killer in first place so we can just -ENOMEM user.
>>
>> Just supressing OOM kill is a bad idea. We still leave a way to allocate
>> arbitrary large buffer in kernel.
At the very least, mm could limit that kind of "arbitrary". If the machine has
x GB (swap included) and the admin tries to make the kernel allocate space for
an x GB ruleset, no way is it going to be satisfiable _even with OOM_.
>I think we should try to allocate whatever amount of memory is needed
>for the given xtables ruleset, given that is what admin requested us to do.
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