我正在尝试在嵌入式 Linux 系统上使用 dropbear 建立一个 chroot 监狱。我在用着这一页作为指导，尽管我必须根据我的目标稍微调整它。
我相信一切都应该正确设置。但是，当我尝试连接时，外壳似乎几乎立即退出。
我已经捕获了输出strace（下面是我认为是输出的相关部分） - 它只是应该处理 shell 的 busybox 进程的输出。
这是 dropbear 启动并尝试连接后的输出（我不认为加载这些密钥失败是一个问题，它成功加载了 RSA 密钥，这就是我们在没有 chroot Jail 的情况下工作所需的全部内容） ）：
[1752] Apr 24 16:23:50 Failed loading /etc/dropbear/dropbear_dss_host_key
[1752] Apr 24 16:23:50 Failed loading /etc/dropbear/dropbear_ecdsa_host_key
[1752] Apr 24 16:23:50 Not backgrounding
[1757] Apr 24 16:23:57 Child connection from 192.168.3.113:52163
[1757] Apr 24 16:23:57 Pubkey auth succeeded for 'filexfer' with key md5 f3:1d:ff:a5:29:7b:1e:e8:fe:0b:b4:bf:e8:33:a4:15 from 192.168.3.113:52163
[1757] Apr 24 16:23:57 Exit (filexfer): Exited normally
这是我认为相关的 strace 输出。
[pid 1737] rt_sigaction(SIGCHLD, {SIG_DFL, [CHLD], SA_RESTART|0x4000000}, <unfinished ...>
[pid 1737] <... rt_sigaction resumed> {0x225e4, [], SA_NOCLDSTOP|0x4000000}, 8) = 0
[pid 1737] dup2(6, 0) = 0
[pid 1737] dup2(9, 1) = 1
[pid 1737] dup2(11, 2) = 2
[pid 1737] close(7) = 0
[pid 1737] close(6) = 0
[pid 1737] close(8) = 0
[pid 1737] close(9) = 0
[pid 1737] close(10) = 0
[pid 1737] close(11) = 0
[pid 1737] open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999988})
[pid 1737] read(6, "\207\203\\\207\211\35.EA\340[\260\356h\345n\366\36\256d\252O\236\371N\"\352\4\330\5i4", 32) = 32
[pid 1737] close(6) = 0
[pid 1737] open("/proc/timer_list", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999992})
[pid 1737] read(6, "Timer List Version: v0.7\nHRTIMER"..., 4096) = 2450
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999991})
[pid 1737] read(6, "", 4096) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/interrupts", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, " CPU0 \n 28: "..., 4096) = 1213
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 4096) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/loadavg", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999993})
[pid 1737] read(6, "0.00 0.01 0.05 1/65 1737\n", 4096) = 25
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 4096) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/sys/kernel/random/entropy_avail", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999982})
[pid 1737] read(6, "196\n", 4096) = 4
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999993})
[pid 1737] read(6, "", 4096) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/net/netstat", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999989})
[pid 1737] read(6, "TcpExt: SyncookiesSent Syncookie"..., 4096) = 2010
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 2086) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/net/dev", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "Inter-| Receive "..., 4096) = 569
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999995})
[pid 1737] read(6, "", 3527) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/net/tcp", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, " sl local_address rem_address "..., 4096) = 450
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 3646) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/net/rt_cache", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999993})
[pid 1737] read(6, "Iface\tDestination\tGateway \tFlags"..., 4096) = 128
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 3968) = 0
[pid 1737] close(6) = 0
[pid 1737] open("/proc/vmstat", O_RDONLY|O_LARGEFILE) = 6
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "nr_free_pages 112743\nnr_alloc_ba"..., 4096) = 1658
[pid 1737] select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999994})
[pid 1737] read(6, "", 4096) = 0
[pid 1737] close(6) = 0
[pid 1737] gettimeofday({1493050478, 344430}, NULL) = 0
[pid 1737] times({tms_utime=0, tms_stime=0, tms_cutime=0, tms_cstime=0}) = 144217
[pid 1737] open("/dev/urandom", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 6
[pid 1737] fstat64(6, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
[pid 1737] ioctl(6, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0xbe98c13c) = -1 EINVAL (Invalid argument)
[pid 1737] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6f31000
[pid 1737] write(6, "\3672\272 <\300W\16\340j\0210gr\207+\242\267\303JE\20oc\35\17K\337|O\242\274", 32) = 32
[pid 1737] close(6) = 0
[pid 1737] munmap(0xb6f31000, 4096) = 0
[pid 1737] getuid32() = 0
[pid 1737] setgid32(2000) = 0
[pid 1737] open("/proc/sys/kernel/ngroups_max", O_RDONLY) = 6
[pid 1737] read(6, "65536\n", 31) = 6
[pid 1737] close(6) = 0
[pid 1737] socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
[pid 1737] connect(6, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
[pid 1737] close(6) = 0
[pid 1737] socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
[pid 1737] connect(6, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
[pid 1737] close(6) = 0
[pid 1737] open("/etc/group", O_RDONLY|O_CLOEXEC) = 6
[pid 1737] _llseek(6, 0, [0], SEEK_CUR) = 0
[pid 1737] fstat64(6, {st_mode=S_IFREG|0644, st_size=17, ...}) = 0
[pid 1737] mmap2(NULL, 17, PROT_READ, MAP_SHARED, 6, 0) = 0xb6f31000
[pid 1737] _llseek(6, 17, [17], SEEK_SET) = 0
[pid 1737] fstat64(6, {st_mode=S_IFREG|0644, st_size=17, ...}) = 0
[pid 1737] munmap(0xb6f31000, 17) = 0
[pid 1737] close(6) = 0
[pid 1737] setgroups32(1, [2000]) = 0
[pid 1737] setuid32(2000) = 0
[pid 1737] chdir("/home/filexfer") = 0
[pid 1737] rt_sigaction(SIGPIPE, {SIG_DFL, [PIPE], SA_RESTART|0x4000000}, {SIG_IGN, [PIPE], SA_RESTART|0x4000000}, 8) = 0
[pid 1737] close(3) = 0
[pid 1737] close(4) = 0
[pid 1737] close(5) = 0
[pid 1737] execve("/bin/sh", ["sh", "-c", "/usr/lib/openssh/sftp-server"], [/* 6 vars */]) = 0
[pid 1737] brk(0) = 0xa0000
[pid 1737] uname({sys="Linux", node="unknown", ...}) = 0
[pid 1737] access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
[pid 1737] mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fec000
[pid 1737] access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
[pid 1737] open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/tls", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/arm-linux-gnueabihf/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/arm-linux-gnueabihf", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/tls", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/usr/lib/arm-linux-gnueabihf/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/usr/lib/arm-linux-gnueabihf", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/tls", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/v7l/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/v7l/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/v7l/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/v7l/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/v7l/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/v7l/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/v7l/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/v7l", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/neon/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/neon/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/neon/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/neon", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/vfp/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 1737] stat64("/lib/vfp", 0xbec864f0) = -1 ENOENT (No such file or directory)
[pid 1737] open("/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
[pid 1737] read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\335\4\214D4\0\0\0"..., 512) = 512
[pid 1737] lseek(3, 887460, SEEK_SET) = 887460
[pid 1737] read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1480) = 1480
[pid 1737] lseek(3, 885236, SEEK_SET) = 885236
[pid 1737] read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., 53) = 53
[pid 1737] fstat64(3, {st_mode=S_IFREG|0755, st_size=888940, ...}) = 0
[pid 1737] mmap2(0x448a8000, 928112, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x448a8000
[pid 1737] mprotect(0x4497d000, 32768, PROT_NONE) = 0
[pid 1737] mmap2(0x44985000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd5000) = 0x44985000
[pid 1737] mmap2(0x44989000, 6512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x44989000
[pid 1737] close(3) = 0
[pid 1737] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6feb000
[pid 1737] set_tls(0xb6feb820, 0xb6febef8, 0x44817048, 0xb6feb820, 0xb6feb158) = 0
[pid 1737] mprotect(0x44985000, 8192, PROT_READ) = 0
[pid 1737] mprotect(0x44816000, 4096, PROT_READ) = 0
[pid 1737] getuid32() = 2000
[pid 1737] stat64("/etc/busybox.conf", 0xbec86b80) = -1 ENOENT (No such file or directory)
[pid 1737] getgid32() = 2000
[pid 1737] setgid32(2000) = 0
[pid 1737] setuid32(2000) = 0
[pid 1737] brk(0) = 0xa0000
[pid 1737] brk(0xc1000) = 0xc1000
[pid 1737] getpid() = 1737
[pid 1737] rt_sigaction(SIGCHLD, {SIG_DFL, [CHLD], SA_RESTART|0x4000000}, {SIG_DFL, [], 0}, 8) = 0
[pid 1737] rt_sigaction(SIGHUP, {SIG_DFL, [HUP], SA_RESTART|0x4000000}, {SIG_DFL, [], 0}, 8) = 0
[pid 1737] getppid() = 1736
[pid 1737] getcwd("/home/filexfer", 4096) = 15
[pid 1737] rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
[pid 1737] rt_sigaction(SIGINT, {0x37dbc, ~[RTMIN RT_1], 0x4000000 /* SA_??? */}, NULL, 8) = 0
[pid 1737] rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0
[pid 1737] rt_sigaction(SIGQUIT, {SIG_IGN, ~[RTMIN RT_1], 0x4000000 /* SA_??? */}, NULL, 8) = 0
[pid 1737] rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0
[pid 1737] rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], 0x4000000 /* SA_??? */}, NULL, 8) = 0
[pid 1737] clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb6feb3c8) = 1738
[pid 1737] wait4(-1, Process 1738 attached
[pid 1737] <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 127}], 0, NULL) = 1738
[pid 1737] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=1738, si_status=127, si_utime=0, si_stime=0} ---
[pid 1737] exit_group(127) = ?
[pid 1737] +++ exited with 127 +++
答案1
事实证明，我libnss*在 chroot 文件系统中丢失了一个库，这是我通过花费大量时间仔细查看大量输出而发现的strace。