centos7中sshd -t没内容输出日志也没内容但sshd服务重启一直失败解决方法、strace命令的使用以及使用场景说明

文章目录

ssh服务启动报错问题
扩展知识【strace命令】

ssh服务启动报错问题

sshd启动报错说明

sshd服务如果起不来，查日志一般都会有相应信息记录，如果sshd -t中有输出，不会解决的话百度一下一般都是有解决方案的，我这主要声明的是sshd -t和日志中都没有输出有用信息的情况下如何解决sshd服务起不来。
如下图，这些都是没有记录的【日志中记录的也是下图第三个红圈中内容，就不记录了，再控制台登录的该虚拟机不能翻页，也麻烦】
确定服务端口这些都是没有的

解决方法

常规排除定位法解决

遇到上述这种情况，先检查下面2样
- 1、防火墙【一般防火墙不会限制sshd服务，但不排除做了特殊限制，所以可以先关闭防火墙测试】
- 2、关闭selinux【同理，一般情况selinux不会限制sshd服务的启动，但不排除特殊情况，所以可以临时关闭selinux做测试】
防火墙检查
执行我下面3个命令，如果都没有内容，证明是没有防火墙的，sshd服务依然起不来，明显不是防火墙的问题。
selinux检查
我这就是selinux的原因，很离谱，selinux竟然影响了我的sshd服务的正常启动。关闭selinux问题就解决了，命令如下图。

修改ssh的selinux上下文

上面我们已经定位到是selinux的原因导致我们无法正常启动sshd服务，既然问题定位到，那么肯定不能光靠关闭selinux为最终解决方案的，所以我们现在修改ssh的上下文，保证selinux开启情况下，依然能启动sshd服务。
首先将selinux打开，并且可以看到sshd服务又不能启动了。
现在做上下文的修改【其实考红毛rhce的时候考过修改上下文，但是忘了，毕竟谁会在意这个上下文呢，对吧。我工作3年多，从来没有遇到过需要修改上下文的问题，但没遇到不代表不需要掌握相关知识对吧】
命令：semanage port -a -t ssh_port_t -p tcp 12345【注：12345是ssh的端口，我将22修改为12345了，如果你是22，那么需要将12345修改为22啊】
建议自行百度单独了解下上下文的原理以及修改的意义，我就不单独在这说明了。
补充一下，我这台主机配置文件中selinux是为开启状态
【如果你上述方法解决不了看看配置文件是不是为permissive：因为先修改配置文件为permissive，重启生效后，临时设置enforcing然后修改端口，重启服务就会报错】

扩展知识【strace命令】

按照strace官网的描述, strace是一个可用于诊断、调试和教学的Linux用户空间跟踪器。我们用它来监控用户空间进程和内核的交互，比如系统调用、信号传递、进程状态变更等。
- strace底层使用内核的ptrace特性来实现其功能。
- 在运维的日常工作中，故障处理和问题诊断是个主要的内容，也是必备的技能。strace作为一种动态跟踪工具，能够帮助运维高效地定位进程和服务故障。它像是一个侦探，通过系统调用的蛛丝马迹，告诉你异常的真相。
这是个很牛逼的命令，简单来说，遇到常规方法解决不了的报错问题之类的，最终就可以利用strace命令来解决，内容有点多而且我目前为止还没遇到过常规场景解决不了的问题，所以没有深究，所以跳转这个文章去了解一下吧：
strace命令详解
补充:保存strace输出信息到虚拟机上的使用方法：strace -o a.txt systemctl restart sshd 【-o后面就是存放嘛，很多命令都是这个参数，最后面就是命令了】
下面是我这导出的数据内容，可以看下默认内容输出。

execve("/usr/bin/systemctl", ["systemctl", "start", "sshd"], [/* 46 vars */]) = 0
brk(NULL)                               = 0x560fc4a41000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b3e000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=79847, ...}) = 0
mmap(NULL, 79847, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f96c7b2a000
close(3)                                = 0
open("/lib64/librt.so.1", 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\340!\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=43776, ...}) = 0
mmap(NULL, 2128920, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c7716000
mprotect(0x7f96c771d000, 2093056, PROT_NONE) = 0
mmap(0x7f96c791c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f96c791c000
close(3)                                = 0
open("/lib64/libselinux.so.1", 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\320i\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=155784, ...}) = 0
mmap(NULL, 2255184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c74ef000
mprotect(0x7f96c7513000, 2093056, PROT_NONE) = 0
mmap(0x7f96c7712000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x23000) = 0x7f96c7712000
mmap(0x7f96c7714000, 6480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f96c7714000
close(3)                                = 0
open("/lib64/liblzma.so.5", 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\2000\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=157424, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b29000
mmap(NULL, 2249352, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c72c9000
mprotect(0x7f96c72ee000, 2093056, PROT_NONE) = 0
mmap(0x7f96c74ed000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7f96c74ed000
close(3)                                = 0
open("/lib64/liblz4.so.1", 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%\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=85952, ...}) = 0
mmap(NULL, 2179400, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c70b4000
mprotect(0x7f96c70c8000, 2093056, PROT_NONE) = 0
mmap(0x7f96c72c7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13000) = 0x7f96c72c7000
close(3)                                = 0
open("/lib64/libgcrypt.so.11", 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\0u\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=535064, ...}) = 0
mmap(NULL, 2621648, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c6e33000
mprotect(0x7f96c6eb0000, 2093056, PROT_NONE) = 0
mmap(0x7f96c70af000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7c000) = 0x7f96c70af000
mmap(0x7f96c70b3000, 208, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f96c70b3000
close(3)                                = 0
open("/lib64/libcap.so.2", 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 \26\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=20032, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b28000
mmap(NULL, 2114112, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c6c2e000
mprotect(0x7f96c6c32000, 2093056, PROT_NONE) = 0
mmap(0x7f96c6e31000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f96c6e31000
close(3)                                = 0
open("/lib64/libgcc_s.so.1", 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\220*\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=88776, ...}) = 0
mmap(NULL, 2184192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c6a18000
mprotect(0x7f96c6a2d000, 2093056, PROT_NONE) = 0
mmap(0x7f96c6c2c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f96c6c2c000
close(3)                                = 0
open("/lib64/libpthread.so.0", 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\260l\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=141968, ...}) = 0
mmap(NULL, 2208904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c67fc000
mprotect(0x7f96c6813000, 2093056, PROT_NONE) = 0
mmap(0x7f96c6a12000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f96c6a12000
mmap(0x7f96c6a14000, 13448, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f96c6a14000
close(3)                                = 0
open("/lib64/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\0\340$\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2151672, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b27000
mmap(NULL, 3981792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c642f000
mprotect(0x7f96c65f1000, 2097152, PROT_NONE) = 0
mmap(0x7f96c67f1000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c2000) = 0x7f96c67f1000
mmap(0x7f96c67f7000, 16864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f96c67f7000
close(3)                                = 0
open("/lib64/libpcre.so.1", 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\360\25\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=402384, ...}) = 0
mmap(NULL, 2494984, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c61cd000
mprotect(0x7f96c622d000, 2097152, PROT_NONE) = 0
mmap(0x7f96c642d000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x60000) = 0x7f96c642d000
close(3)                                = 0
open("/lib64/libdl.so.2", 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\220\r\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=19288, ...}) = 0
mmap(NULL, 2109712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c5fc9000
mprotect(0x7f96c5fcb000, 2097152, PROT_NONE) = 0
mmap(0x7f96c61cb000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f96c61cb000
close(3)                                = 0
open("/lib64/libgpg-error.so.0", 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\n\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=19384, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b26000
mmap(NULL, 2113656, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c5dc4000
mprotect(0x7f96c5dc8000, 2093056, PROT_NONE) = 0
mmap(0x7f96c5fc7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f96c5fc7000
close(3)                                = 0
open("/lib64/libattr.so.1", 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\23\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=19896, ...}) = 0
mmap(NULL, 2113904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f96c5bbf000
mprotect(0x7f96c5bc3000, 2093056, PROT_NONE) = 0
mmap(0x7f96c5dc2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f96c5dc2000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b25000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b24000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b22000
arch_prctl(ARCH_SET_FS, 0x7f96c7b22880) = 0
mprotect(0x7f96c67f1000, 16384, PROT_READ) = 0
mprotect(0x7f96c5dc2000, 4096, PROT_READ) = 0
mprotect(0x7f96c5fc7000, 4096, PROT_READ) = 0
mprotect(0x7f96c61cb000, 4096, PROT_READ) = 0
mprotect(0x7f96c6a12000, 4096, PROT_READ) = 0
mprotect(0x7f96c642d000, 4096, PROT_READ) = 0
mprotect(0x7f96c6c2c000, 4096, PROT_READ) = 0
mprotect(0x7f96c6e31000, 4096, PROT_READ) = 0
mprotect(0x7f96c70af000, 4096, PROT_READ) = 0
mprotect(0x7f96c72c7000, 4096, PROT_READ) = 0
mprotect(0x7f96c74ed000, 4096, PROT_READ) = 0
mprotect(0x7f96c7712000, 4096, PROT_READ) = 0
mprotect(0x7f96c791c000, 4096, PROT_READ) = 0
stat("/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned", 0x7fffd4a08ce0) = -1 ENOENT (No such file or directory)
mprotect(0x560fc2b75000, 20480, PROT_READ) = 0
mprotect(0x7f96c7b3f000, 4096, PROT_READ) = 0
munmap(0x7f96c7b2a000, 79847)           = 0
set_tid_address(0x7f96c7b22b50)         = 63508
set_robust_list(0x7f96c7b22b60, 24)     = 0
rt_sigaction(SIGRTMIN, {0x7f96c6802790, [], SA_RESTORER|SA_SIGINFO, 0x7f96c680b5d0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7f96c6802820, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f96c680b5d0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
brk(NULL)                               = 0x560fc4a41000
brk(0x560fc4a62000)                     = 0x560fc4a62000
access("/etc/system-fips", F_OK)        = -1 ENOENT (No such file or directory)
statfs("/sys/fs/selinux", {f_type=SELINUX_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
statfs("/sys/fs/selinux", {f_type=SELINUX_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/sys/fs/selinux", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
access("/etc/selinux/config", F_OK)     = 0
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106075056, ...}) = 0
mmap(NULL, 106075056, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f96bf695000
close(3)                                = 0
open("/proc/self/stat", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f96c7b3d000
read(3, "63508 (systemctl) R 63506 63506 "..., 1024) = 345
close(3)                                = 0
munmap(0x7f96c7b3d000, 4096)            = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
stat("/proc/1/root", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
stat("/proc/1/root", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
lstat("/run/systemd/system/", {st_mode=S_IFDIR|0755, st_size=240, ...}) = 0
geteuid()                               = 0
socket(AF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
setsockopt(3, SOL_SOCKET, SO_PASSCRED, [1], 4) = 0
setsockopt(3, SOL_SOCKET, SO_PASSSEC, [0], 4) = 0
getsockopt(3, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUFFORCE, [8388608], 4) = 0
getsockopt(3, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0
setsockopt(3, SOL_SOCKET, SO_SNDBUFFORCE, [8388608], 4) = 0
connect(3, {sa_family=AF_LOCAL, sun_path="/run/systemd/private"}, 22) = 0
getsockopt(3, SOL_SOCKET, SO_PEERCRED, {pid=1, uid=0, gid=0}, [12]) = 0
getsockopt(3, SOL_SOCKET, SO_PEERSEC, "system_u:system_r:init_t:s0-s0:c"..., [40]) = 0
fstat(3, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
getsockopt(3, SOL_SOCKET, SO_ACCEPTCONN, [0], [4]) = 0
getsockname(3, {sa_family=AF_LOCAL, sun_path=@"00028"}, [8]) = 0
geteuid()                               = 0
sendmsg(3, {msg_name(0)=NULL, msg_iov(3)=[{"\0AUTH EXTERNAL ", 15}, {"30", 2}, {"\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n", 28}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 45
getsockopt(3, SOL_SOCKET, SO_PEERCRED, {pid=1, uid=0, gid=0}, [12]) = 0
stat("/proc/1/root", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f96c7b22b50) = 63509
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
pipe2([4, 5], 0)                        = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f96c7b22b50) = 63510
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
close(5)                                = 0
ppoll([{fd=4, events=POLLHUP}], 1, NULL, NULL, 8) = 1 ([{fd=4, revents=POLLHUP}])
close(4)                                = 0
gettid()                                = 63508
getrandom("C\320\257\305\242\260)&\356+F\220y\312+\221", 16, GRND_NONBLOCK) = 16
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"OK 77de88e5c0f247e4ac51f73effb5b"..., 256}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 52
sendmsg(3, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\4\1 \0\0\0\1\0\0\0\240\0\0\0\1\1o\0\31\0\0\0/org/fre"..., 176}, {"\f\0\0\0sshd.service\0\0\0\0\7\0\0\0replace\0", 32}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 208
recvmsg(3, 0x7fffd4a08c80, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, {24, 999762000}, NULL, 8) = 1 ([{fd=3, revents=POLLIN}], left {24, 998894258})
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1'\0\0\0\1\0\0\0\17\0\0\0\5\1u\0\1\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\10\1g\0\1o\0\0\"\0\0\0/org/freedesktop/sys"..., 47}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 47
sendmsg(3, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\21\0\0\0\2\0\0\0\227\0\0\0\1\1o\0\31\0\0\0/org/fre"..., 168}, {"\f\0\0\0sshd.service\0", 17}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 185
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1D\0\0\0\2\0\0\0q\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 180}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 180
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1=\0\0\0\3\0\0\0q\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 173}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 173
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1M\0\0\0\4\0\0\0z\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 197}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 197
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1!\2\0\0\5\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 681}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 681
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1\364\2\0\0\6\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 892}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 892
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1H\0\0\0\7\0\0\0\206\0\0\0\1\1o\0\"\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/job/30"..., 200}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 200
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\0012\0\0\0\10\0\0\0\17\0\0\0\5\1u\0\2\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\10\1g\0\1o\0\0-\0\0\0/org/freedesktop/sys"..., 58}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 58
sendmsg(3, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\0019\0\0\0\3\0\0\0\240\0\0\0\1\1o\0-\0\0\0/org/fre"..., 176}, {"\35\0\0\0org.freedesktop.systemd1.Uni"..., 57}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 233
recvmsg(3, 0x7fffd4a08a60, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, {24, 999895000}, NULL, 8) = 1 ([{fd=3, revents=POLLIN}], left {24, 999359713})
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1\10\0\0\0\t\0\0\0\17\0\0\0\5\1u\0\3\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\10\1g\0\1v\0\0\1b\0\0\0\0\0\0", 16}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 16
recvmsg(3, 0x7fffd4a08ab0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, NULL, NULL, 8) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1D\0\0\0\n\0\0\0q\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 180}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 180
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1H\0\0\0\v\0\0\0\206\0\0\0\1\1o\0\"\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/job/30"..., 200}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 200
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1M\0\0\0\f\0\0\0z\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 197}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 197
recvmsg(3, 0x7fffd4a08ab0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, NULL, NULL, 8) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1!\2\0\0\r\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 681}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 681
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1\354\2\0\0\16\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 884}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 884
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1H\0\0\0\17\0\0\0\206\0\0\0\1\1o\0\"\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/job/30"..., 200}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 200
recvmsg(3, 0x7fffd4a08ab0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, NULL, NULL, 8) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1K\0\0\0\20\0\0\0z\0\0\0\1\1o\0\31\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1\0\0\0\0\0\0\0"..., 195}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 195
sendmsg(3, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\0013\0\0\0\4\0\0\0\240\0\0\0\1\1o\0-\0\0\0/org/fre"..., 176}, {" \0\0\0org.freedesktop.systemd1.Ser"..., 51}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 227
recvmsg(3, 0x7fffd4a08a30, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, {24, 999947000}, NULL, 8) = 1 ([{fd=3, revents=POLLIN}], left {24, 999001172})
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1!\2\0\0\21\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 681}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 681
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1\324\2\0\0\22\0\0\0\216\0\0\0\1\1o\0-\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"/org/freedesktop/systemd1/unit/s"..., 860}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 860
recvmsg(3, 0x7fffd4a08a30, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, {24, 998742000}, NULL, 8) = 1 ([{fd=3, revents=POLLIN}], left {24, 998102848})
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1\22\0\0\0\23\0\0\0\17\0\0\0\5\1u\0\4\0\0\0", 24}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\10\1g\0\1v\0\0\1s\0\0\t\0\0\0exit-code\0", 26}], msg_controllen=32, [{cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, {pid=1, uid=0, gid=0}}], msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 26
writev(2, [{"Job for sshd.service failed beca"..., 149}, {"\n", 1}], 2) = 150
kill(63509, SIGTERM)                    = 0
kill(63509, SIGCONT)                    = 0
waitid(P_PID, 63509, {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=63509, si_uid=0, si_status=0, si_utime=0, si_stime=0}, WEXITED, NULL) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=63509, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
kill(63510, SIGTERM)                    = 0
kill(63510, SIGCONT)                    = 0
waitid(P_PID, 63510, {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=63510, si_uid=0, si_status=SIGTERM, si_utime=0, si_stime=0}, WEXITED, NULL) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=63510, si_uid=0, si_status=SIGTERM, si_utime=0, si_stime=0} ---
close(3)                                = 0
exit_group(1)                           = ?
+++ exited with 1 +++

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原文地址：https://blog.csdn.net/cuichongxin/article/details/128074847