See attachment. Hope this helps
Harri
1 epoll_wait(4, [{EPOLLIN, {u32=3589379376, u64=94720503158064}}], 36, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=425983895}) = 0
1 recvmsg(29, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="WATCHDOG=1\n", iov_len=4096}], msg_iovlen=1, msg_control=[{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, cmsg_data={pid=75, uid=0, gid=0}}], msg_controllen=32, msg_flags=MSG_CMSG_CLOEXEC}, MSG_TRUNC|MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 11
1 openat(AT_FDCWD, "/proc/75/cgroup", O_RDONLY|O_CLOEXEC) = 23
1 fstat(23, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
1 read(23, "13:name=systemd:/system.slice/in"..., 1024) = 290
1 read(23, "", 1024) = 0
1 close(23) = 0
1 timerfd_settime(25, TFD_TIMER_ABSTIME, {it_interval={tv_sec=0, tv_nsec=0}, it_value={tv_sec=4562321, tv_nsec=677590000}}, NULL) = 0
1 epoll_wait(4, [{EPOLLIN, {u32=3588589904, u64=94720502368592}}], 36, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=795336025}) = 0
1 accept4(17, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK) = 23
1 getsockopt(23, SOL_SOCKET, SO_PEERCRED, {pid=1613131, uid=0, gid=0}, [12]) = 0
1 fcntl(23, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
1 fcntl(23, F_GETFD) = 0x1 (flags FD_CLOEXEC)
1 fstat(23, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
1 getsockopt(23, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0
1 setsockopt(23, SOL_SOCKET, SO_RCVBUF, [8388608], 4) = 0
1 getsockopt(23, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0
1 setsockopt(23, SOL_SOCKET, SO_SNDBUF, [8388608], 4) = 0
1 getsockopt(23, SOL_SOCKET, SO_PEERCRED, {pid=1613131, uid=0, gid=0}, [12]) = 0
1 getsockopt(23, SOL_SOCKET, SO_PEERSEC, 0x5625d5f8beb0, [64]) = -1 ENOPROTOOPT (Protocol not available)
1 getsockopt(23, SOL_SOCKET, SO_PEERGROUPS, [0], [256->4]) = 0
1 fstat(23, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
1 getsockopt(23, SOL_SOCKET, SO_ACCEPTCONN, [0], [4]) = 0
1 getsockname(23, {sa_family=AF_UNIX, sun_path="/run/systemd/private"}, [128->23]) = 0
1 recvmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\0AUTH EXTERNAL 30\r\nNEGOTIATE_UNI"..., iov_len=256}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 45
1 epoll_ctl(4, EPOLL_CTL_ADD, 23, {0, {u32=3589061440, u64=94720502840128}}) = 0
1 epoll_ctl(4, EPOLL_CTL_MOD, 23, {EPOLLIN|EPOLLOUT, {u32=3589061440, u64=94720502840128}}) = 0
1 epoll_wait(4, [{EPOLLOUT, {u32=3589061440, u64=94720502840128}}], 39, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=801992152}) = 0
1 sendmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="OK 7afb570fdfeb4f7584b0d7b5c98ae"..., iov_len=52}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}], msg_iovlen=3, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 52
1 epoll_ctl(4, EPOLL_CTL_MOD, 23, {EPOLLIN, {u32=3589061440, u64=94720502840128}}) = 0
1 epoll_wait(4, [{EPOLLIN, {u32=3589061440, u64=94720502840128}}], 39, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=802457504}) = 0
1 epoll_wait(4, [{EPOLLIN, {u32=3589061440, u64=94720502840128}}], 39, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=802669666}) = 0
1 recvmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\4\1 \0\0\0\1\0\0\0\241\0\0\0\1\1o\0\31\0\0\0", iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 24
1 recvmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., iov_len=192}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 192
1 getuid() = 0
1 kill(1544456, SIGHUP) = 0
1 openat(AT_FDCWD, "/sys/fs/cgroup/unified/system.slice/rsyslog.service/cgroup.procs", O_RDONLY|O_CLOEXEC) = 24
1 fstat(24, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
1 read(24, "0\n1544456\n", 4096) = 10
1 close(24) = 0
1 openat(AT_FDCWD, "/sys/fs/cgroup/unified/system.slice/rsyslog.service", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 24
1 fstat(24, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
1 getdents64(24, /* 12 entries */, 32768) = 432
1 getdents64(24, /* 0 entries */, 32768) = 0
1 close(24) = 0
1 sendmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\3\1\1\27\0\0\0\1\0\0\0g\0\0\0\5\1u\0\1\0\0\0\4\1s\0\"\0\0\0"..., iov_len=120}, {iov_base="\22\0\0\0Input/output error\0", iov_len=23}], msg_iovlen=2, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 143
1 epoll_wait(4, [{EPOLLIN|EPOLLHUP, {u32=3589061440, u64=94720502840128}}], 39, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=804552631}) = 0
1 recvmsg(23, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 0
1 epoll_ctl(4, EPOLL_CTL_MOD, 23, {0, {u32=3589061440, u64=94720502840128}}) = 0
1 timerfd_settime(25, TFD_TIMER_ABSTIME, {it_interval={tv_sec=0, tv_nsec=0}, it_value={tv_sec=0, tv_nsec=1}}, NULL) = 0
1 epoll_wait(4, [{EPOLLHUP, {u32=3589061440, u64=94720502840128}}, {EPOLLIN, {u32=3588552944, u64=94720502331632}}], 39, -1) = 2
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562316, tv_nsec=805025384}) = 0
1 read(25, "\1\0\0\0\0\0\0\0", 8) = 8
1 epoll_ctl(4, EPOLL_CTL_DEL, 23, NULL) = 0
1 close(23) = 0
1 timerfd_settime(25, TFD_TIMER_ABSTIME, {it_interval={tv_sec=0, tv_nsec=0}, it_value={tv_sec=4562321, tv_nsec=677590000}}, NULL) = 0
1 epoll_wait(4, [{EPOLLIN, {u32=3589379376, u64=94720503158064}}], 36, -1) = 1
1 clock_gettime(CLOCK_BOOTTIME, {tv_sec=4562318, tv_nsec=924442061}) = 0
1 recvmsg(29, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="WATCHDOG=1\n", iov_len=4096}], msg_iovlen=1, msg_control=[{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, cmsg_data={pid=75, uid=0, gid=0}}], msg_controllen=32, msg_flags=MSG_CMSG_CLOEXEC}, MSG_TRUNC|MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 11
1 openat(AT_FDCWD, "/proc/75/cgroup", O_RDONLY|O_CLOEXEC) = 23
1 fstat(23, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
1 read(23, "13:name=systemd:/system.slice/in"..., 1024) = 290
1 read(23, "", 1024) = 0
1 close(23) = 0
1 timerfd_settime(25, TFD_TIMER_ABSTIME, {it_interval={tv_sec=0, tv_nsec=0}, it_value={tv_sec=4562323, tv_nsec=927590000}}, NULL) = 0
1 epoll_wait(4, <detached ...>
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