Messages in this thread | | | Date | Sun, 05 Apr 2009 12:30:17 +0200 | From | Eric Dumazet <> | Subject | Re: Regression caused by commit "netfilter: iptables: lock free counters" |
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Graham Murray a écrit : > Eric Dumazet <dada1@cosmosbay.com> writes: > >>>>> 784544739a25c30637397ace5489eeb6e15d7d49 is first bad commit >>>>> commit 784544739a25c30637397ace5489eeb6e15d7d49 >>>> I am seeing a different problem which also bisects to this commit. There are >>>> no kernel messages but ip6tables fails to run. >>>> >>>> newton ~ # ip6tables -L -v >>>> FATAL: Module ip6_tables not found. >>>> ip6tables v1.4.3.1: can't initialize ip6tables table `filter': Memory allocation problem >>>> Perhaps ip6tables or your kernel needs to be upgraded. >>>> >>>> I get this error no matter which ip6tables sub-command I run. Ip6tables >>>> is built into the kernel, not as modules. >>>> >>>> An strace shows the failure to be >>>> socket(PF_INET6, SOCK_RAW, IPPROTO_RAW) = 3 >>>> getsockopt(3, SOL_IPV6, 0x40 /* IPV6_??? */, "filter\0\305\0w~\300\0wb\305P\24\312\t\0009b\305\216\23\0\0\310\341/g\16"..., [84]) = 0 >>>> brk(0) = 0x8273000 >>>> brk(0x8294000) = 0x8294000 >> so ip6tables allocates about 128 Kbytes of ram in order to get rules from kernel. >> >>>> getsockopt(3, SOL_IPV6, 0x41 /* IPV6_??? */, 0x8273090, 0xbfd23628) = -1 ENOMEM (Cannot allocate memory) >>>> close(3) = 0 >>>> >> >> This is a big problem yes, since "iptables|ip6tables" -L needs to allocate kernel memory >> to perform the momentary swap. >> >> On x86, this is potentially a problem if vmalloc space is exhausted or fragmented, >> (or lowmem exhausted) and/or many cpus are online/possible. > > iptables gives me no problems at all, it is just ip6tables that > fails. The first indication of this is during the init scripts when > ip6tables-restore fails.
I see, its a plain bug in net/ipv6/netfilter/ip6_tables.c function alloc_counters() always returns -ENOMEM
Unfortunatly , its Sunday here and I have to run for lunch time with family :)
If nobody beats me, I will do the fix in a couple of hours...
Thank you
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