* nf_conntrack: falling back to vmalloc. @ 2015-07-17 9:00 Toralf Förster 2015-07-17 10:10 ` Florian Westphal 0 siblings, 1 reply; 5+ messages in thread From: Toralf Förster @ 2015-07-17 9:00 UTC (permalink / raw) To: netfilter-devel; +Cc: Linux Kernel I do run a server with a 64 bit hardened Gentoo Linux (kernel currently 4.0.8). Around 12th of July it started to spew those messages into kern.log : /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650490] nf_conntrack: falling back to vmalloc. /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650615] nf_conntrack: falling back to vmalloc. /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673649] nf_conntrack: falling back to vmalloc. /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673786] nf_conntrack: falling back to vmalloc. I read https://bugzilla.openvz.org/show_bug.cgi?id=3092 but a reboot did not help. I got 1-2 thousends of those lines per day. Any hints ? -- Toralf, pgp key: 872AE508 0076E94E ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: nf_conntrack: falling back to vmalloc. 2015-07-17 9:00 nf_conntrack: falling back to vmalloc Toralf Förster @ 2015-07-17 10:10 ` Florian Westphal 2015-07-17 14:34 ` Toralf Förster 2015-07-23 10:45 ` Pablo Neira Ayuso 0 siblings, 2 replies; 5+ messages in thread From: Florian Westphal @ 2015-07-17 10:10 UTC (permalink / raw) To: Toralf Förster Cc: netfilter-devel, Linux Kernel, Pablo Neira Ayuso, kaber, Marcelo Leitner Toralf Förster <toralf.foerster@gmx.de> wrote: > I do run a server with a 64 bit hardened Gentoo Linux (kernel currently 4.0.8). > Around 12th of July it started to spew those messages into kern.log : > > /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650490] nf_conntrack: falling back to vmalloc. > /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650615] nf_conntrack: falling back to vmalloc. > /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673649] nf_conntrack: falling back to vmalloc. > /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673786] nf_conntrack: falling back to vmalloc. > > I read https://bugzilla.openvz.org/show_bug.cgi?id=3092 but a reboot did not help. > I got 1-2 thousends of those lines per day. Most likely result of 88eab472ec21f01d3e36ff ("netfilter: conntrack: adjust nf_conntrack_buckets default value". Do you run containers? This message can only be printed when a new network namespace is created (or something is rmmod/modprobing nf_conntrack module all the time). I wonder if this is caused by some program creating netns for sandboxing? Pablo, Patrick -- any idea on how to stop conntrack from becoming active in a newly created netns automatically without breaking anything? With upcoming per netns hooks, we might be able to delay registering conntrack, defrag etc. until after a -m conntrack rule has been added. Dou you think that could work? For nft we could create an expression to configure conntrack explicitly (inverse NOTRACK). [ obviously we can also add that for xtables but that would break setups if we suddently move to "you must ask for conntrack via ruleset" model. ] -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: nf_conntrack: falling back to vmalloc. 2015-07-17 10:10 ` Florian Westphal @ 2015-07-17 14:34 ` Toralf Förster 2015-07-17 15:02 ` Florian Westphal 2015-07-23 10:45 ` Pablo Neira Ayuso 1 sibling, 1 reply; 5+ messages in thread From: Toralf Förster @ 2015-07-17 14:34 UTC (permalink / raw) To: Florian Westphal Cc: netfilter-devel, Linux Kernel, Pablo Neira Ayuso, kaber, Marcelo Leitner On 07/17/2015 12:10 PM, Florian Westphal wrote: > Do you run containers? No, I just run 4 Gentoo chroot images in parallel - but I do that since autumn last year. Unfortunately I cannot see any correlation to an os/sw upgrade or a config change which could cause these messages nowadays to be appear. Therefore I do wonder if some network related "traffic" causes this, b/c that box acts as a Tor exit relay too. -- Toralf, pgp key: 872AE508 0076E94E ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: nf_conntrack: falling back to vmalloc. 2015-07-17 14:34 ` Toralf Förster @ 2015-07-17 15:02 ` Florian Westphal 0 siblings, 0 replies; 5+ messages in thread From: Florian Westphal @ 2015-07-17 15:02 UTC (permalink / raw) To: Toralf Förster Cc: Florian Westphal, netfilter-devel, Linux Kernel, Pablo Neira Ayuso, kaber, Marcelo Leitner Toralf Förster <toralf.foerster@gmx.de> wrote: > On 07/17/2015 12:10 PM, Florian Westphal wrote: > > Do you run containers? > > No, I just run 4 Gentoo chroot images in parallel - but I do that since autumn last year. > > Unfortunately I cannot see any correlation to an os/sw upgrade or a config change which could cause these messages nowadays to be appear. > Therefore I do wonder if some network related "traffic" causes this, b/c that box acts as a Tor exit relay too. No, I see no way how this would happen in response to network traffic. A conntrack hash table is only allocated on network namespace creation, or when a resize happens (someone changing /sys/module/nf_conntrack/parameters/hashsize). -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: nf_conntrack: falling back to vmalloc. 2015-07-17 10:10 ` Florian Westphal 2015-07-17 14:34 ` Toralf Förster @ 2015-07-23 10:45 ` Pablo Neira Ayuso 1 sibling, 0 replies; 5+ messages in thread From: Pablo Neira Ayuso @ 2015-07-23 10:45 UTC (permalink / raw) To: Florian Westphal Cc: Toralf Förster, netfilter-devel, Linux Kernel, kaber, Marcelo Leitner [-- Attachment #1: Type: text/plain, Size: 1893 bytes --] On Fri, Jul 17, 2015 at 12:10:09PM +0200, Florian Westphal wrote: > Toralf Förster <toralf.foerster@gmx.de> wrote: > > I do run a server with a 64 bit hardened Gentoo Linux (kernel currently 4.0.8). > > Around 12th of July it started to spew those messages into kern.log : > > > > /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650490] nf_conntrack: falling back to vmalloc. > > /var/log/kern.log:Jul 12 15:26:07 tor-relay kernel: [538360.650615] nf_conntrack: falling back to vmalloc. > > /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673649] nf_conntrack: falling back to vmalloc. > > /var/log/kern.log:Jul 12 15:26:08 tor-relay kernel: [538361.673786] nf_conntrack: falling back to vmalloc. > > > > I read https://bugzilla.openvz.org/show_bug.cgi?id=3092 but a reboot did not help. > > I got 1-2 thousends of those lines per day. > > Most likely result of 88eab472ec21f01d3e36ff ("netfilter: conntrack: > adjust nf_conntrack_buckets default value". I think we can get rid of that warning, it will most likely shown every time after that patch. [...] > Pablo, Patrick -- any idea on how to stop conntrack from becoming active > in a newly created netns automatically without breaking anything? > > With upcoming per netns hooks, we might be able to delay registering > conntrack, defrag etc. until after a -m conntrack rule has been added. > Dou you think that could work? > > For nft we could create an expression to configure conntrack explicitly > (inverse NOTRACK). > > [ obviously we can also add that for xtables but that would break > setups if we suddently move to "you must ask for conntrack via > ruleset" model. ] With netns in place, I think it's now clear that we need that this is configurable at ruleset level that we've been discussing for a while. But users will have to request this new behaviour to avoid breaking existing setups... [-- Attachment #2: x.patch --] [-- Type: text/x-diff, Size: 603 bytes --] diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 13fad86..9b7dc11 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1522,10 +1522,8 @@ void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) sz = nr_slots * sizeof(struct hlist_nulls_head); hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, get_order(sz)); - if (!hash) { - printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); + if (!hash) hash = vzalloc(sz); - } if (hash && nulls) for (i = 0; i < nr_slots; i++) ^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-07-23 10:39 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-07-17 9:00 nf_conntrack: falling back to vmalloc Toralf Förster 2015-07-17 10:10 ` Florian Westphal 2015-07-17 14:34 ` Toralf Förster 2015-07-17 15:02 ` Florian Westphal 2015-07-23 10:45 ` Pablo Neira Ayuso
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