[ec2-user@ip-172-31-19-78 tmp]$ ls /nfs_dir/
test.txt
[ec2-user@ip-172-31-19-78 tmp]$ strace cp test.txt /nfs_dir/test.txt
execve("/usr/bin/cp", ["cp", "test.txt", "/nfs_dir/test.txt"], 0x7ffdbbe7cf70 /* 23 vars */) = 0
brk(NULL)                               = 0x1b9b000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=28038, ...}) = 0
mmap(NULL, 28038, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8efaba6000
close(3)                                = 0
openat(AT_FDCWD, "/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\20j\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=155680, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8efaba4000
mmap(NULL, 2255216, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8efa763000
mprotect(0x7f8efa787000, 2093056, PROT_NONE) = 0
mmap(0x7f8efa986000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x23000) = 0x7f8efa986000
mmap(0x7f8efa988000, 6512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8efa988000
close(3)                                = 0
openat(AT_FDCWD, "/lib64/libacl.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\240\36\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=37000, ...}) = 0
mmap(NULL, 2130560, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8efa55a000
mprotect(0x7f8efa561000, 2097152, PROT_NONE) = 0
mmap(0x7f8efa761000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f8efa761000
close(3)                                = 0
openat(AT_FDCWD, "/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@\23\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=19816, ...}) = 0
mmap(NULL, 2113896, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8efa355000
mprotect(0x7f8efa359000, 2093056, PROT_NONE) = 0
mmap(0x7f8efa558000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f8efa558000
close(3)                                = 0
openat(AT_FDCWD, "/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@\21\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2021312, ...}) = 0
mmap(NULL, 3844768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8ef9faa000
mprotect(0x7f8efa14b000, 2097152, PROT_NONE) = 0
mmap(0x7f8efa34b000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a1000) = 0x7f8efa34b000
mmap(0x7f8efa351000, 15008, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8efa351000
close(3)                                = 0
openat(AT_FDCWD, "/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\0p\25\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=410400, ...}) = 0
mmap(NULL, 2503144, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8ef9d46000
mprotect(0x7f8ef9da9000, 2093056, PROT_NONE) = 0
mmap(0x7f8ef9fa8000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x62000) = 0x7f8ef9fa8000
close(3)                                = 0
openat(AT_FDCWD, "/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\340\16\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=19208, ...}) = 0
mmap(NULL, 2109744, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8ef9b42000
mprotect(0x7f8ef9b45000, 2093056, PROT_NONE) = 0
mmap(0x7f8ef9d44000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f8ef9d44000
close(3)                                = 0
openat(AT_FDCWD, "/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\0pa\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=149272, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8efaba2000
mmap(NULL, 2217064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8ef9924000
mprotect(0x7f8ef993c000, 2097152, PROT_NONE) = 0
mmap(0x7f8ef9b3c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0x7f8ef9b3c000
mmap(0x7f8ef9b3e000, 13416, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8ef9b3e000
close(3)                                = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8efab9f000
arch_prctl(ARCH_SET_FS, 0x7f8efab9f800) = 0
mprotect(0x7f8efa34b000, 16384, PROT_READ) = 0
mprotect(0x7f8ef9b3c000, 4096, PROT_READ) = 0
mprotect(0x7f8ef9d44000, 4096, PROT_READ) = 0
mprotect(0x7f8ef9fa8000, 4096, PROT_READ) = 0
mprotect(0x7f8efa558000, 4096, PROT_READ) = 0
mprotect(0x7f8efa761000, 4096, PROT_READ) = 0
mprotect(0x7f8efa986000, 4096, PROT_READ) = 0
mprotect(0x621000, 4096, PROT_READ)     = 0
mprotect(0x7f8efabad000, 4096, PROT_READ) = 0
munmap(0x7f8efaba6000, 28038)           = 0
set_tid_address(0x7f8efab9fad0)         = 16437
set_robust_list(0x7f8efab9fae0, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f8ef9929c30, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f8ef99357e0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f8ef9929cb0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f8ef99357e0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
statfs("/sys/fs/selinux", 0x7ffdcf7ce960) = -1 ENOENT (No such file or directory)
statfs("/selinux", 0x7ffdcf7ce960)      = -1 ENOENT (No such file or directory)
brk(NULL)                               = 0x1b9b000
brk(0x1bbc000)                          = 0x1bbc000
openat(AT_FDCWD, "/proc/filesystems", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tr"..., 1024) = 328
read(3, "", 1024)                       = 0
close(3)                                = 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=113049440, ...}) = 0
mmap(NULL, 113049440, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8ef2d54000
close(3)                                = 0
geteuid()                               = 1000
stat("/nfs_dir/test.txt", {st_mode=S_IFREG|0664, st_size=3, ...}) = 0
stat("test.txt", {st_mode=S_IFREG|0664, st_size=3, ...}) = 0
stat("/nfs_dir/test.txt", {st_mode=S_IFREG|0664, st_size=3, ...}) = 0
openat(AT_FDCWD, "test.txt", O_RDONLY)  = 3
fstat(3, {st_mode=S_IFREG|0664, st_size=3, ...}) = 0
openat(AT_FDCWD, "/nfs_dir/test.txt", O_WRONLY|O_TRUNC) = 4
fstat(4, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
fadvise64(3, 0, 0, POSIX_FADV_SEQUENTIAL) = 0
mmap(NULL, 1056768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8efaa9d000
read(3, "OK\n", 1048576)                = 3
write(4, "OK\n", 3)                     = 3
read(3, "", 1048576)                    = 0
close(4)                                = 0
close(3)                                = 0
munmap(0x7f8efaa9d000, 1056768)         = 0
lseek(0, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
close(0)                                = 0
close(1)                                = 0
close(2)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++
[ec2-user@ip-172-31-19-78 tmp]$