Package: iptables Version: 1.8.2-3 Severity: important Dear Maintainer,
for now I am rating this important. If it happens for many users it may have a higher severity. It may however also be a kernel issue, as it happened after upgrading to self-compiled 5.0-rc2. I upgraded to self-compiled 5.0-rc2 today and found the machine to be slow after startup. I saw iptables consuming 100% CPU, it only responded to SIGKILL. It got restarted several times, probably by some systemd service. Then I started 'iptables -nvL' manually. And I got this: % strace -p 5748 [… tons more, in what appeared an endless loop …] recvmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=372, type=0xa06 /* NLMSG_??? */, flags=NLM_F_MULTI|0x800, seq=0, pid=5748}, "\x02\x00\x00\x11\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0b\x00\x02\x00\x4f\x55\x54\x50\x55\x54\x00\x00\x0c\x00\x03\x00"...}, iov_len=16536}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 372 recvmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=372, type=0xa06 /* NLMSG_??? */, flags=NLM_F_MULTI|0x800, seq=0, pid=5748}, "\x02\x00\x00\x11\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0b\x00\x02\x00\x4f\x55\x54\x50\x55\x54\x00\x00\x0c\x00\x03\x00"...}, iov_len=16536}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 372 recvmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=372, type=0xa06 /* NLMSG_??? */, flags=NLM_F_MULTI|0x800, seq=0, pid=5748}, "\x02\x00\x00\x11\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0b\x00\x02\x00\x4f\x55\x54\x50\x55\x54\x00\x00\x0c\x00\x03\x00"...}, iov_len=16536}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 372 recvmsg(3, ^C{msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=372, type=0xa06 /* NLMSG_??? */, flags=NLM_F_MULTI|0x800, seq=0, pid=5748}, "\x02\x00\x00\x11\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0b\x00\x02\x00\x4f\x55\x54\x50\x55\x54\x00\x00\x0c\x00\x03\x00"...}, iov_len=16536}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 372 strace: Process 5748 detached and this (output from atop): PID TID MINFLT MAJFLT VSTEXT VSLIBS VDATA VSTACK VSIZE RSIZE PSIZE VGROW RGROW SWAPSZ RUID EUID MEM CMD 1/16 11575 - 61552 0 152K 2324K 5.0G 132K 5.1G 5.1G 0K 240.4M 240.5M 0K root root 33% iptables I had it growing till 10 GiB before I stopped it by SIGKILL to prevent excessive swapping. I will attach kernel configuration. That is all I am willing to spend time on for now before going to sleep. I will however reboot with older 4.20 kernel to see whether it is kernel related. Thanks, Martin -- System Information: Debian Release: buster/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable'), (200, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.0.0-rc2-tp520 (SMP w/4 CPU cores; PREEMPT) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages iptables depends on: ii libc6 2.28-5 ii libip4tc0 1.8.2-3 ii libip6tc0 1.8.2-3 ii libiptc0 1.8.2-3 ii libmnl0 1.0.4-2 ii libnetfilter-conntrack3 1.0.7-1 ii libnfnetlink0 1.0.1-3+b1 ii libnftnl11 1.1.2-2 ii libxtables12 1.8.2-3 Versions of packages iptables recommends: ii nftables 0.9.0-2 Versions of packages iptables suggests: ii kmod 25-2 -- no debconf information