We got strace log root@krane-ay1prod-com0280:~# strace -fv ebtables -t nat --concurrent -L execve("/sbin/ebtables", ["ebtables", "-t", "nat", "--concurrent", "-L"], ["PYENV_ROOT=/opt/pyenv", "SHELL=/bin/bash", "TERM=xterm-256color", "HISTSIZE=1000", "SSH_TTY=/dev/pts/11", "LC_ALL=en_US.UTF-8", "USER=root", "LS_COLORS=rs=0:di=01;34:ln=01;36"..., "SUDO_USER=deploy", "SUDO_UID=1000", "TMOUT=7200", "USERNAME=root", "LIBVIRT_DEFAULT_URI=qemu:///syst"..., "SSH_CLI=10.60.39.222", "MAIL=/var/mail/root", "PATH=/opt/pyenv/shims:/opt/pyenv"..., "PWD=/root", "LANG=en_US.UTF-8", "PYENV_SHELL=bash", "SHLVL=1", "SUDO_COMMAND=/bin/bash", "HOME=/root", "ADDITIONAL_NO_PROXY=.krane.iwila"..., "LANGUAGE=en_US:", "LC_TERMINAL_VERSION=3.3.7", "LOGNAME=root", "LC_CTYPE=UTF-8", "LESSOPEN=| /usr/bin/lesspipe %s", "PROMPT_COMMAND=EXIT_CODE=$? && d"..., "SUDO_GID=1000", "LC_TERMINAL=iTerm2", "LESSCLOSE=/usr/bin/lesspipe %s %"..., "HISTTIMEFORMAT=%F %T ", "SSH_ID=RSA-SHA256:Ap2X89VM+tClGr"..., "_=/usr/bin/strace"]) = 0 brk(NULL) = 0x1f98000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/lib/ebtables/tls/x86_64/libebt_802_3.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/lib/ebtables/tls/x86_64", 0x7ffe0d016c20) = -1 ENOENT (No such file or directory) open("/lib/ebtables/tls/libebt_802_3.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/lib/ebtables/tls", 0x7ffe0d016c20) = -1 ENOENT (No such file or directory) open("/lib/ebtables/x86_64/libebt_802_3.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/lib/ebtables/x86_64", 0x7ffe0d016c20) = -1 ENOENT (No such file or directory) open("/lib/ebtables/libebt_802_3.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\7\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819095, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10032, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fcc000 mmap(NULL, 2105664, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff859ba5000 mprotect(0x7ff859ba6000, 2097152, PROT_NONE) = 0 mmap(0x7ff859da6000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff859da6000 close(3) = 0 open("/lib/ebtables/libebt_nat.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\t\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819085, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10456, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2106024, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff8599a2000 mprotect(0x7ff8599a4000, 2093056, PROT_NONE) = 0 mmap(0x7ff859ba3000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff859ba3000 close(3) = 0 open("/lib/ebtables/libebt_arp.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\f\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819109, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=32, st_size=14496, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2110048, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85979e000 mprotect(0x7ff8597a0000, 2097152, PROT_NONE) = 0 mmap(0x7ff8599a0000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7ff8599a0000 close(3) = 0 open("/lib/ebtables/libebt_arpreply.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819097, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10136, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fcb000 mmap(NULL, 2105704, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85959b000 mprotect(0x7ff85959d000, 2093056, PROT_NONE) = 0 mmap(0x7ff85979c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff85979c000 close(3) = 0 open("/lib/ebtables/libebt_ip.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\n\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819079, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10384, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2106016, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff859398000 mprotect(0x7ff85939a000, 2093056, PROT_NONE) = 0 mmap(0x7ff859599000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff859599000 close(3) = 0 open("/lib/ebtables/libebt_ip6.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\16\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819103, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=40, st_size=18304, st_atime=2020/02/13-14:54:35.335391990, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2113856, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff859193000 mprotect(0x7ff859196000, 2097152, PROT_NONE) = 0 mmap(0x7ff859396000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7ff859396000 close(3) = 0 open("/lib/ebtables/libebt_standard.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240\5\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819073, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5808, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fca000 mmap(NULL, 2101472, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858f91000 mprotect(0x7ff858f92000, 2093056, PROT_NONE) = 0 mmap(0x7ff859191000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff859191000 close(3) = 0 open("/lib/ebtables/libebt_log.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\t\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819087, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10272, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2105824, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858d8e000 mprotect(0x7ff858d90000, 2093056, PROT_NONE) = 0 mmap(0x7ff858f8f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff858f8f000 close(3) = 0 open("/lib/ebtables/libebt_redirect.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\7\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819071, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5904, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2101536, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858b8c000 mprotect(0x7ff858b8d000, 2093056, PROT_NONE) = 0 mmap(0x7ff858d8c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff858d8c000 close(3) = 0 open("/lib/ebtables/libebt_vlan.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819107, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10168, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fc9000 mmap(NULL, 2105736, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858989000 mprotect(0x7ff85898b000, 2093056, PROT_NONE) = 0 mmap(0x7ff858b8a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff858b8a000 close(3) = 0 open("/lib/ebtables/libebt_mark_m.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \7\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819099, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5904, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2101536, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858787000 mprotect(0x7ff858788000, 2093056, PROT_NONE) = 0 mmap(0x7ff858987000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff858987000 close(3) = 0 open("/lib/ebtables/libebt_mark.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\7\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819111, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10232, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2105800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858584000 mprotect(0x7ff858586000, 2093056, PROT_NONE) = 0 mmap(0x7ff858785000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff858785000 close(3) = 0 open("/lib/ebtables/libebt_pkttype.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819093, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10064, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fc8000 mmap(NULL, 2105696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff858381000 mprotect(0x7ff858382000, 2097152, PROT_NONE) = 0 mmap(0x7ff858582000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff858582000 close(3) = 0 open("/lib/ebtables/libebt_stp.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\n\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819113, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=32, st_size=14512, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2110144, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85817d000 mprotect(0x7ff858180000, 2093056, PROT_NONE) = 0 mmap(0x7ff85837f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7ff85837f000 close(3) = 0 open("/lib/ebtables/libebt_among.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\v\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819075, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=32, st_size=14392, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2109960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff857f79000 mprotect(0x7ff857f7c000, 2093056, PROT_NONE) = 0 mmap(0x7ff85817b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7ff85817b000 close(3) = 0 open("/lib/ebtables/libebt_limit.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819105, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10144, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fc7000 mmap(NULL, 2105696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff857d76000 mprotect(0x7ff857d78000, 2093056, PROT_NONE) = 0 mmap(0x7ff857f77000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff857f77000 close(3) = 0 open("/lib/ebtables/libebt_ulog.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819083, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10160, st_atime=2020/02/13-14:54:35.339392028, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2105792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff857b73000 mprotect(0x7ff857b75000, 2093056, PROT_NONE) = 0 mmap(0x7ff857d74000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff857d74000 close(3) = 0 open("/lib/ebtables/libebt_nflog.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\10\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819081, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=10160, st_atime=2020/02/13-14:54:35.343392065, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2105792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff857970000 mprotect(0x7ff857972000, 2093056, PROT_NONE) = 0 mmap(0x7ff857b71000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7ff857b71000 close(3) = 0 open("/lib/ebtables/libebtable_filter.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\5\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819091, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5672, st_atime=2020/02/13-14:54:35.343392065, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fc6000 mmap(NULL, 2101368, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85776e000 mprotect(0x7ff85776f000, 2093056, PROT_NONE) = 0 mmap(0x7ff85796e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff85796e000 close(3) = 0 open("/lib/ebtables/libebtable_nat.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\5\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819101, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5672, st_atime=2020/02/13-14:54:35.343392065, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2101368, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85756c000 mprotect(0x7ff85756d000, 2093056, PROT_NONE) = 0 mmap(0x7ff85776c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff85776c000 close(3) = 0 open("/lib/ebtables/libebtable_broute.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\4\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819077, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=5672, st_atime=2020/02/13-14:54:35.343392065, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 2101368, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff85736a000 mprotect(0x7ff85736b000, 2093056, PROT_NONE) = 0 mmap(0x7ff85756a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7ff85756a000 close(3) = 0 open("/lib/ebtables/libebtc.so", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 0\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87819089, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=136, st_size=69536, st_atime=2020/02/13-14:54:35.343392065, st_mtime=2018/06/29-03:17:40, st_ctime=2019/10/11-17:14:44.944338761}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fc5000 mmap(NULL, 2173680, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff857157000 mprotect(0x7ff857167000, 2093056, PROT_NONE) = 0 mmap(0x7ff857366000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7ff857366000 mmap(0x7ff857368000, 6896, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7ff857368000 close(3) = 0 open("/lib/ebtables/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_dev=makedev(259, 4), st_ino=18352138, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=88, st_size=42101, st_atime=2020/02/13-14:39:47.058940019, st_mtime=2020/02/13-14:39:47.054939981, st_ctime=2020/02/13-14:39:47.054939981}) = 0 mmap(NULL, 42101, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff859fba000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_dev=makedev(259, 4), st_ino=87818433, st_mode=S_IFREG|0755, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=3656, st_size=1868984, st_atime=2020/02/12-15:53:36.963494808, st_mtime=2019/02/06-05:11:22, st_ctime=2019/10/10-15:50:21.797152380}) = 0 mmap(NULL, 3971488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7ff856d8d000 mprotect(0x7ff856f4d000, 2097152, PROT_NONE) = 0 mmap(0x7ff85714d000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7ff85714d000 mmap(0x7ff857153000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7ff857153000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fb9000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fb8000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fb7000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff859fb6000 arch_prctl(ARCH_SET_FS, 0x7ff859fb7700) = 0 mprotect(0x7ff85714d000, 16384, PROT_READ) = 0 mprotect(0x7ff857366000, 4096, PROT_READ) = 0 mprotect(0x7ff85756a000, 4096, PROT_READ) = 0 mprotect(0x7ff85776c000, 4096, PROT_READ) = 0 mprotect(0x7ff85796e000, 4096, PROT_READ) = 0 mprotect(0x7ff857b71000, 4096, PROT_READ) = 0 mprotect(0x7ff857d74000, 4096, PROT_READ) = 0 mprotect(0x7ff857f77000, 4096, PROT_READ) = 0 mprotect(0x7ff85817b000, 4096, PROT_READ) = 0 mprotect(0x7ff85837f000, 4096, PROT_READ) = 0 mprotect(0x7ff858582000, 4096, PROT_READ) = 0 mprotect(0x7ff858785000, 4096, PROT_READ) = 0 mprotect(0x7ff858987000, 4096, PROT_READ) = 0 mprotect(0x7ff858b8a000, 4096, PROT_READ) = 0 mprotect(0x7ff858d8c000, 4096, PROT_READ) = 0 mprotect(0x7ff858f8f000, 4096, PROT_READ) = 0 mprotect(0x7ff859191000, 4096, PROT_READ) = 0 mprotect(0x7ff859396000, 4096, PROT_READ) = 0 mprotect(0x7ff859599000, 4096, PROT_READ) = 0 mprotect(0x7ff85979c000, 4096, PROT_READ) = 0 mprotect(0x7ff8599a0000, 4096, PROT_READ) = 0 mprotect(0x7ff859ba3000, 4096, PROT_READ) = 0 mprotect(0x7ff859da6000, 4096, PROT_READ) = 0 mprotect(0x600000, 4096, PROT_READ) = 0 mprotect(0x7ff859fcd000, 4096, PROT_READ) = 0 munmap(0x7ff859fba000, 42101) = 0 brk(NULL) = 0x1f98000 brk(0x1fb9000) = 0x1fb9000 rt_sigaction(SIGINT, {0x7ff85715f8d0, [INT], SA_RESTORER|SA_RESTART, 0x7ff856dc24b0}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGTERM, {0x7ff85715f8d0, [TERM], SA_RESTORER|SA_RESTART, 0x7ff856dc24b0}, {SIG_DFL, [], 0}, 8) = 0 open("/run/ebtables.lock", O_WRONLY|O_CREAT, 0600) = 3 fcntl(3, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = 0 socket(PF_INET, SOCK_RAW, IPPROTO_IGMP) = 4 getsockopt(4, SOL_IP, EBT_SO_GET_INFO, packet_write_wait: Connection to 10.91.13.28 port 22: Broken pipe And bug found which likely to affect this case. (ebtables: fix race condition in frame_filter_net_init(): https://lore.kernel.org/patchwork/patch/834743/). I checked our kernel (4.13.0-41-generic) is running without the patch and I suspect the bug makes kernel crush. But I cannot replay the bug with some script (while test 1; do rmmod ebtable_nat; rmmod ebtable_filter; ebtables -t nat -L; done) Does anybody let me know how to reproduce the bug? 2020년 2월 12일 (수) 오전 11:37, 양유석 <ileixe@xxxxxxxxx>님이 작성: > > I wish I can check rsyslog first. It do have the last command (etables > --concurrent -t nat -L). But unfortunately, there is no more command. > I will try to use netconsole which seems to log for kernel. > > 2020년 2월 11일 (화) 오후 11:15, G.W. Haywood <ged@xxxxxxxxxxxxxxxxxx>님이 작성: > > > > Hi there, > > > > On Tue, 11 Feb 2020, 양유석 wrote: > > > > > 2020년 2월 11일 (화) 오후 9:47, G.W. Haywood ... > > >> ... Mr. Millar's suggestion is good too. > > > > > > ... where is Mr.Millar's suggestion? ... > > > > https://marc.info/?l=netfilter&m=158142378531784&w=2 > > > > -- > > > > 73, > > Ged.