(CC netfilter-devel and netdev) On Mon, Jan 14, 2019 at 11:53:10PM +0100, Martin Steigerwald wrote: > Hi! > > Does that ring a bell with someone? For now I just downgraded, no time > for detailed analysis. > > Debian bug report at: > > iptables -nvL consumes 100% of CPU and hogs memory with kernel 5.0-rc2 > https://bugs.debian.org/919325 > > 4.20 works, 5.0-rc2 showed this issue with iptables. Configurations attached. > > Excerpt from Debian bug report follows: > > 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. > > […] > > -- System Information: > Debian Release: buster/sid > […] > Kernel: Linux 5.0.0-rc2-tp520 (SMP w/4 CPU cores; PREEMPT) > > Thanks, > -- > Martin
