Hi, We migrated the perdition machine to a VM as well as upgrade the package from perdition-1.17 to perdition-1.18. day. I finally have a time to strace the perdition.pop3 dead of what is happening, here is the info: accept(4, {sa_family=AF_INET, sin_port=htons(53846), sin_addr=inet_addr("<IP Address so show>")}, [6256062840960974864]) = 5 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b1169929a80) = 21625 close(5) = 0 fcntl(4, F_SETFL, O_RDWR) = 0 poll([{fd=4, events=POLLIN}], 1, -1) = -1 EINTR (Interrupted system call) --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigaction(SIGCHLD, {0x405260, [CHLD], SA_RESTORER|SA_RESTART, 0x2b1167c4f2d0}, {0x405260, [CHLD], SA_RESTORER|SA_RESTART, 0x2b1167c4f2d0}, 8) = 0 wait4(4294967295, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG, NULL) = 21609 wait4(4294967295, 0x7fffcd9be574, WNOHANG, NULL) = 0 rt_sigreturn(0xffffffff) = -1 EINTR (Interrupted system call) poll([{fd=4, events=POLLIN}], 1, -1) = -1 EINTR (Interrupted system call) --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigaction(SIGCHLD, {0x405260, [CHLD], SA_RESTORER|SA_RESTART, 0x2b1167c4f2d0}, {0x405260, [CHLD], SA_RESTORER|SA_RESTART, 0x2b1167c4f2d0}, 8) = 0 wait4(4294967295, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG, NULL) = 21622 wait4(4294967295, 0x7fffcd9be574, WNOHANG, NULL) = 0 rt_sigreturn(0xffffffff) = -1 EINTR (Interrupted system call) poll([{fd=4, events=POLLIN}], 1, -1) = 1 ([{fd=4, revents=POLLIN}]) fcntl(4, F_GETFL) = 0x2 (flags O_RDWR) fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 accept(4, {sa_family=AF_INET, sin_port=htons(2005), sin_addr=inet_addr("<IP Address so show>")}, [15350237863505559568]) = 5 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b1169929a80) = 21626 close(5) = 0 fcntl(4, F_SETFL, O_RDWR) = 0 poll([{fd=4, events=POLLIN}], 1, -1) = 1 ([{fd=4, revents=POLLIN}]) fcntl(4, F_GETFL) = 0x2 (flags O_RDWR) fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 accept(4, {sa_family=AF_INET, sin_port=htons(51774), sin_addr=inet_addr("<IP Address so show>")}, [4524428784237019152]) = 5 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b1169929a80) = 21627 close(5) = 0 fcntl(4, F_SETFL, O_RDWR) = 0 poll([{fd=4, events=POLLIN}], 1, -1) = 1 ([{fd=4, revents=POLLIN}]) fcntl(4, F_GETFL) = 0x2 (flags O_RDWR) fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 *accept(4, 0x7fffcd9be920, [4524428784237019264]) = -1 ECONNABORTED (Software caused connection abort) accept(4, 0x7fffcd9be920, [4524428784237019264]) = -1 EAGAIN (Resource temporarily unavailable)* fcntl(4, F_SETFL, O_RDWR) = 0 time([1323309467]) = 1323309467 stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2183, ...}) = 0 stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2183, ...}) = 0 stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2183, ...}) = 0 sendto(3, "<19>Dec 8 12:57:47 perdition[73"..., 86, MSG_NOSIGNAL, NULL, 0) = -1 ENOTCONN (Transport endpoint is not connected) close(3) = 0 socket(PF_FILE, SOCK_DGRAM, 0) = 3 fcntl(3, F_SETFD, FD_CLOEXEC) = 0 connect(3, {sa_family=AF_FILE, path="/dev/log"...}, 110) = 0 sendto(3, "<19>Dec 8 12:57:47 perdition[73"..., 86, MSG_NOSIGNAL, NULL, 0) = 86unlink("/var/run/perdition.pop3/perdition.pop3.pid") = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}) = 0 close(0) = 0 close(1) = 0 close(2) = 0 close(3) = 0 .... .. This is also catched similarly at different VM too. I checked the source, it seems 1.17 is using blockIO while 1.18 use nonBlockIO. At the vanessa_socket_server.c static pid_t __vanessa_socket_server_accept(int *g, int listen_socket, int *listen_socketv,... ... .. for(;;) { addrlen = sizeof(from); *g = accept(listen_socket, (struct sockaddr *) &from, &addrlen); if (*g < 0) { if(errno == EINTR || errno == ECONNABORTED) { continue; /* Ignore EINTR and ECONNABORTED */ } if (errno == EAGAIN || errno == EWOULDBLOCK) return -1; /* Don't log EAGAIN or EWOULDBLOCK */ VANESSA_LOGGER_DEBUG_ERRNO("accept"); return(-1); } .... .. So if the perdition face an ECONNABORTED, it accept() again, it will return -1 if there is no incoming socket, after a few return, it seems that (not sure) it will out of the loop and "goto out" and finally return to perdition to exit the program. Is there a patch for that? or the later version fix this?