There ist massive and repeating output of the following lines:
pread64(39, "\0\0\0n\0\0007l\0\0\0\0\0\0\0\0", 16, 24) = 16
newfstatat(AT_FDCWD, "/etc/pihole/gravity.db-wal", 0x7fc79f42a0, 0) = -1 ENOENT (No such file or directory)
fstat(39, {st_mode=S_IFREG|0640, st_size=58114048, ...}) = 0
fcntl(39, F_SETLK, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = 0
fcntl(39, F_SETLK, {l_type=F_RDLCK, l_whence=SEEK_SET, l_start=1073741824, l_len=1}) = 0
fcntl(39, F_SETLK, {l_type=F_RDLCK, l_whence=SEEK_SET, l_start=1073741826, l_len=510}) = 0
fcntl(39, F_SETLK, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=1073741824, l_len=1}) = 0
only the last for digits of this 0x7fc79f42a0 are changing.
Every 5 or more seconds you can find:
write(37, "Mar 7 07:23:55 dnsmasq[17063]: "..., 73) = 73
sendmsg(20, {msg_name={sa_family=AF_INET, sin_port=htons(35415), sin_addr=inet_addr("10.0.0.1")}, msg_namelen=16, msg_iov=[{iov_base="\343D\201\200\0\1\0\0\0\1\0\0\5a1806\7dscw154\6akama"..., iov_len=109}], msg_iovlen=1, msg_control=[{cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO, cmsg_data={ipi_ifindex=0, ipi_spec_dst=inet_addr("10.0.0.3"), ipi_addr=inet_addr("0.0.0.0")}}], msg_controllen=32, msg_flags=0}, 0) = 109
ppoll([{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=21, events=POLLIN}, {fd=22, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24, events=POLLIN}, {fd=25, events=POLLIN}, {fd=43, events=POLLIN}], 8, NULL, NULL, 8) = 1 ([{fd=20, revents=POLLIN}])
recvmsg(20, {msg_name={sa_family=AF_INET, sin_port=htons(35415), sin_addr=inet_addr("10.0.0.1")}, msg_namelen=28 => 16, msg_iov=[{iov_base="U\234\1\0\0\1\0\0\0\0\0\0\16musicstatus-eu\21edge"..., iov_len=1232}], msg_iovlen=1, msg_control=[{cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO, cmsg_data={ipi_ifindex=if_nametoindex("eth0"), ipi_spec_dst=inet_addr("10.0.0.3"), ipi_addr=inet_addr("10.0.0.3")}}], msg_controllen=32, msg_flags=0}, 0) = 65
ioctl(20, SIOCGIFNAME, {ifr_ifindex=2, ifr_name="eth0"}) = 0
getpid() = 17063
getpid() = 17063
gettid() = 17063
getpid() = 17063
which I interpret as the thing which should happen.