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
config-4.20.0-tp520.xz
Description: application/xz
config-5.0.0-rc2-tp520.xz
Description: application/xz
