On Wed, Sep 13, 2017 at 9:45 AM, Cong Wang <xiyou.wangc...@gmail.com> wrote: > On Wed, Sep 13, 2017 at 1:05 AM, Florian Westphal <f...@strlen.de> wrote: >> Cong Wang <xiyou.wangc...@gmail.com> wrote: >>> While testing my TC filter patches (so not related to conntrack), the >>> following memory leaks are shown up: >>> >>> unreferenced object 0xffff9b19ba551228 (size 128): >>> comm "chronyd", pid 338, jiffies 4294910829 (age 53.188s) >>> hex dump (first 32 bytes): >>> 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk >>> 00 00 00 00 18 00 00 30 00 00 00 00 00 00 00 00 .......0........ >>> backtrace: >>> [<ffffffff9f1e1175>] create_object+0x169/0x2aa >>> [<ffffffff9fb77fb2>] kmemleak_alloc+0x25/0x41 >>> [<ffffffff9f1c47ed>] slab_post_alloc_hook+0x44/0x65 >>> [<ffffffff9f1ca2db>] __kmalloc_track_caller+0x113/0x146 >>> [<ffffffff9f193c3b>] __krealloc+0x4a/0x69 >>> [<ffffffff9f948dbd>] nf_ct_ext_add+0xe1/0x145 >>> [<ffffffff9f942395>] init_conntrack+0x1f7/0x36e >>> [<ffffffff9f942762>] nf_conntrack_in+0x1d3/0x326 >>> [<ffffffff9fa1ea69>] ipv4_conntrack_local+0x4d/0x50 >>> [<ffffffff9f93ad70>] nf_hook_slow+0x3c/0x9b >>> [<ffffffff9f9c7999>] nf_hook.constprop.40+0xbe/0xd8 >>> [<ffffffff9f9c7ba2>] __ip_local_out+0xb3/0xbf >>> [<ffffffff9f9c7bca>] ip_local_out+0x1c/0x36 >>> [<ffffffff9f9c9216>] ip_send_skb+0x19/0x3d >>> [<ffffffff9f9ee3de>] udp_send_skb+0x17e/0x1df >>> [<ffffffff9f9eea37>] udp_sendmsg+0x5a2/0x77c >>> unreferenced object 0xffff9b19a69b3340 (size 336): >>> comm "chronyd", pid 338, jiffies 4294910868 (age 53.032s) >>> hex dump (first 32 bytes): >>> 01 00 00 00 5a 5a 5a 5a 00 00 00 00 ad 4e ad de ....ZZZZ.....N.. >>> ff ff ff ff 5a 5a 5a 5a ff ff ff ff ff ff ff ff ....ZZZZ........ >>> backtrace: >>> [<ffffffff9f1e1175>] create_object+0x169/0x2aa >>> [<ffffffff9fb77fb2>] kmemleak_alloc+0x25/0x41 >>> [<ffffffff9f1c47ed>] slab_post_alloc_hook+0x44/0x65 >>> [<ffffffff9f1c7a7d>] kmem_cache_alloc+0xd7/0x1f1 >>> [<ffffffff9f941b78>] __nf_conntrack_alloc+0xa2/0x146 >>> [<ffffffff9f942250>] init_conntrack+0xb2/0x36e >>> [<ffffffff9f942762>] nf_conntrack_in+0x1d3/0x326 >>> [<ffffffff9fa1ea69>] ipv4_conntrack_local+0x4d/0x50 >>> [<ffffffff9f93ad70>] nf_hook_slow+0x3c/0x9b >>> [<ffffffff9f9c7999>] nf_hook.constprop.40+0xbe/0xd8 >>> [<ffffffff9f9c7ba2>] __ip_local_out+0xb3/0xbf >>> [<ffffffff9f9c7bca>] ip_local_out+0x1c/0x36 >>> [<ffffffff9f9c9216>] ip_send_skb+0x19/0x3d >>> [<ffffffff9f9ee3de>] udp_send_skb+0x17e/0x1df >>> [<ffffffff9f9eea37>] udp_sendmsg+0x5a2/0x77c >>> [<ffffffff9f9f8cb8>] inet_sendmsg+0x37/0x5e >>> >>> I don't touch chronyd in my VM, so I have no idea why it sends out UDP >>> packets, my guess is it is some periodical packet. >>> >>> I don't think I use conntrack either, since /proc/net/ip_conntrack >>> does not exist. >> >> You probably do, can you try "cat /proc/net/nf_conntrack" instead? >> >> (otherwise there should be no ipv4_conntrack_local() invocation >> since we would not register this hook at all). > > Yeah it is very weird but it is true: > > [root@localhost ~]# echo scan > /sys/kernel/debug/kmemleak > [ 133.450823] kmemleak: 18 new suspected memory leaks (see > /sys/kernel/debug/kmemleak) > [root@localhost ~]# cat /proc/net/ip_conntrack > cat: /proc/net/ip_conntrack: No such file or directory > [root@localhost ~]# cat /sys/kernel/debug/kmemleak > unreferenced object 0xffff95c1e0b24040 (size 336): > ...
Oops, you mean nf_conntrack... Here we go: [root@localhost ~]# cat /proc/net/nf_conntrack ipv4 2 udp 17 116 src=192.168.124.6 dst=204.2.134.162 sport=123 dport=123 src=204.2.134.162 dst=192.168.124.6 sport=123 dport=123 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 117 src=192.168.124.6 dst=45.79.187.10 sport=123 dport=123 src=45.79.187.10 dst=192.168.124.6 sport=123 dport=123 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 110 src=192.168.124.6 dst=192.168.124.1 sport=35486 dport=53 src=192.168.124.1 dst=192.168.124.6 sport=53 dport=35486 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 110 src=192.168.124.6 dst=192.168.124.1 sport=52373 dport=53 src=192.168.124.1 dst=192.168.124.6 sport=53 dport=52373 [ASSURED] mark=0 zone=0 use=2 ipv4 2 unknown 2 518 src=192.168.124.6 dst=224.0.0.22 [UNREPLIED] src=224.0.0.22 dst=192.168.124.6 mark=0 zone=0 use=2 ipv4 2 udp 17 110 src=192.168.124.6 dst=192.168.124.1 sport=43242 dport=53 src=192.168.124.1 dst=192.168.124.6 sport=53 dport=43242 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 116 src=192.168.124.6 dst=96.226.123.196 sport=123 dport=123 src=96.226.123.196 dst=192.168.124.6 sport=123 dport=123 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 110 src=192.168.124.6 dst=192.168.124.1 sport=42838 dport=53 src=192.168.124.1 dst=192.168.124.6 sport=53 dport=42838 [ASSURED] mark=0 zone=0 use=2 ipv4 2 udp 17 117 src=192.168.124.6 dst=97.127.104.4 sport=123 dport=123 src=97.127.104.4 dst=192.168.124.6 sport=123 dport=123 [ASSURED] mark=0 zone=0 use=2
