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[Bug 2115838] Re: login command just Hangup immediately

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Seyeong Kim <2115838@xxxxxxxxxxxxxxxxxx>
Date: Thu, 03 Jul 2025 03:45:32 -0000
Reply-to: Bug 2115838 <2115838@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
** Description changed:

  login command just Hangup immediately.
  I see this issue with Plucky and Questing
  
  root@plucky:/home/ubuntu# login
  Hangup
  ubuntu@plucky:~$
+ 
+ 
+ 
+ root@plucky:~# strace login
+ execve("/usr/bin/login", ["login"], 0x7ffd0e2dc9c0 /* 20 vars */) = 0
+ brk(NULL)                               = 0x56e0011a9000
+ mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5962000
+ 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=36429, ...}) = 0
+ mmap(NULL, 36429, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7d04a5959000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpam.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\0\0\0\0\0\0\0\0"..., 832) = 832
+ fstat(3, {st_mode=S_IFREG|0644, st_size=72064, ...}) = 0
+ mmap(NULL, 69648, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5947000
+ mmap(0x7d04a594a000, 40960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7d04a594a000
+ mmap(0x7d04a5954000, 12288, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7d04a5954000
+ mmap(0x7d04a5957000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7d04a5957000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpam_misc.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\0\0\0\0\0\0\0\0"..., 832) = 832
+ fstat(3, {st_mode=S_IFREG|0644, st_size=22856, ...}) = 0
+ mmap(NULL, 24656, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5940000
+ mmap(0x7d04a5942000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7d04a5942000
+ mmap(0x7d04a5944000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7d04a5944000
+ mmap(0x7d04a5945000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7d04a5945000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libaudit.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\0\0\0\0\0\0\0\0"..., 832) = 832
+ fstat(3, {st_mode=S_IFREG|0644, st_size=153760, ...}) = 0
+ mmap(NULL, 200880, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a590e000
+ mmap(0x7d04a5911000, 49152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7d04a5911000
+ mmap(0x7d04a591d000, 86016, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7d04a591d000
+ mmap(0x7d04a5932000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7d04a5932000
+ mmap(0x7d04a5934000, 45232, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7d04a5934000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/lib/x86_64-linux-gnu/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\0\245\2\0\0\0\0\0"..., 832) = 832
+ pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 840, 64) = 840
+ fstat(3, {st_mode=S_IFREG|0755, st_size=2182752, ...}) = 0
+ pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 840, 64) = 840
+ mmap(NULL, 2227832, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5600000
+ mmap(0x7d04a5628000, 1662976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7d04a5628000
+ mmap(0x7d04a57be000, 323584, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1be000) = 0x7d04a57be000
+ mmap(0x7d04a580d000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20c000) = 0x7d04a580d000
+ mmap(0x7d04a5813000, 52856, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7d04a5813000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libcap-ng.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\0\0\0\0\0\0\0\0"..., 832) = 832
+ fstat(3, {st_mode=S_IFREG|0644, st_size=31024, ...}) = 0
+ mmap(NULL, 32816, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5905000
+ mmap(0x7d04a5907000, 16384, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7d04a5907000
+ mmap(0x7d04a590b000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7d04a590b000
+ mmap(0x7d04a590c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7d04a590c000
+ close(3)                                = 0
+ mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5903000
+ mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5901000
+ arch_prctl(ARCH_SET_FS, 0x7d04a59045c0) = 0
+ set_tid_address(0x7d04a5904890)         = 256045
+ set_robust_list(0x7d04a59048a0, 24)     = 0
+ rseq(0x7d04a59044c0, 0x20, 0, 0x53053053) = 0
+ mprotect(0x7d04a580d000, 16384, PROT_READ) = 0
+ mprotect(0x7d04a590c000, 4096, PROT_READ) = 0
+ mprotect(0x7d04a5932000, 4096, PROT_READ) = 0
+ mprotect(0x7d04a5957000, 4096, PROT_READ) = 0
+ mprotect(0x7d04a5945000, 4096, PROT_READ) = 0
+ mprotect(0x56dff9b1b000, 4096, PROT_READ) = 0
+ mprotect(0x7d04a59a4000, 8192, PROT_READ) = 0
+ prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
+ munmap(0x7d04a5959000, 36429)           = 0
+ openat(AT_FDCWD, "/proc/sys/kernel/cap_last_cap", O_RDONLY) = 3
+ fstatfs(3, {f_type=PROC_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={val=[0x18, 0]}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
+ read(3, "40\n", 7)                      = 3
+ close(3)                                = 0
+ prctl(PR_CAPBSET_READ, CAP_CHOWN)       = 1
+ prctl(PR_GET_SECUREBITS)                = 0
+ prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0)  = 0
+ prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_CHOWN, 0, 0) = 0
+ getpid()                                = 256045
+ getrandom("\x65\x99\x4e\x8d\x18\x2d\xba\x42", 8, GRND_NONBLOCK) = 8
+ brk(NULL)                               = 0x56e0011a9000
+ brk(0x56e0011ca000)                     = 0x56e0011ca000
+ openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
+ fstat(3, {st_mode=S_IFREG|0644, st_size=3063024, ...}) = 0
+ mmap(NULL, 3063024, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7d04a5200000
+ close(3)                                = 0
+ openat(AT_FDCWD, "/etc/login.defs", O_RDONLY) = 3
+ fstat(3, {st_mode=S_IFREG|0644, st_size=5939, ...}) = 0
+ read(3, "#\n# /etc/login.defs - Configurat"..., 4096) = 4096
+ read(3, "# any combination of letters \"fr"..., 4096) = 1843
+ read(3, "", 4096)                       = 0
+ close(3)                                = 0
+ openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
+ fstat(3, {st_mode=S_IFREG|0644, st_size=2996, ...}) = 0
+ read(3, "# Locale name alias data base.\n#"..., 4096) = 2996
+ read(3, "", 4096)                       = 0
+ close(3)                                = 0
+ openat(AT_FDCWD, "/usr/share/locale/en_US.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale/en.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
+ rt_sigaction(SIGALRM, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
+ rt_sigaction(SIGALRM, NULL, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, 8) = 0
+ rt_sigaction(SIGALRM, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER, sa_restorer=0x7d04a5645810}, NULL, 8) = 0
+ alarm(60)                               = 0
+ rt_sigaction(SIGQUIT, {sa_handler=SIG_IGN, sa_mask=[QUIT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
+ rt_sigaction(SIGINT, {sa_handler=SIG_IGN, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
+ setpriority(PRIO_PROCESS, 0, 0)         = 0
+ getuid()                                = 0
+ geteuid()                               = 0
+ getgid()                                = 0
+ getegid()                               = 0
+ prctl(PR_GET_DUMPABLE)                  = 1 (SUID_DUMP_USER)
+ close_range(3, 4294967295, 0)           = 0
+ setpgid(0, 0)                           = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ fstat(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}) = 0
+ readlink("/proc/self/fd/0", "/dev/pts/1", 4095) = 10
+ newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}, 0) = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}, AT_SYMLINK_NOFOLLOW) = 0
+ access("/dev/pts/1", R_OK|W_OK)         = 0
+ ioctl(0, TIOCGWINSZ, {ws_row=116, ws_col=345, ws_xpixel=640, ws_ypixel=480}) = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ fchown(0, 0, 0)                         = 0
+ fchmod(0, 0600)                         = 0
+ ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
+ ioctl(0, TCSETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
+ --- SIGTTOU {si_signo=SIGTTOU, si_code=SI_KERNEL} ---
+ --- stopped by SIGTTOU ---

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https://bugs.launchpad.net/bugs/2115838

Title:
  login command just Hangup immediately

Status in util-linux package in Ubuntu:
  New
Status in util-linux source package in Plucky:
  New
Status in util-linux source package in Questing:
  New

Bug description:
  login command just Hangup immediately.
  I see this issue with Plucky and Questing

  root@plucky:/home/ubuntu# login
  Hangup
  ubuntu@plucky:~$


  
  root@plucky:~# strace login
  execve("/usr/bin/login", ["login"], 0x7ffd0e2dc9c0 /* 20 vars */) = 0
  brk(NULL)                               = 0x56e0011a9000
  mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5962000
  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=36429, ...}) = 0
  mmap(NULL, 36429, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7d04a5959000
  close(3)                                = 0
  openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpam.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\0\0\0\0\0\0\0\0"..., 832) = 832
  fstat(3, {st_mode=S_IFREG|0644, st_size=72064, ...}) = 0
  mmap(NULL, 69648, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5947000
  mmap(0x7d04a594a000, 40960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7d04a594a000
  mmap(0x7d04a5954000, 12288, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7d04a5954000
  mmap(0x7d04a5957000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7d04a5957000
  close(3)                                = 0
  openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpam_misc.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\0\0\0\0\0\0\0\0"..., 832) = 832
  fstat(3, {st_mode=S_IFREG|0644, st_size=22856, ...}) = 0
  mmap(NULL, 24656, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5940000
  mmap(0x7d04a5942000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7d04a5942000
  mmap(0x7d04a5944000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7d04a5944000
  mmap(0x7d04a5945000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7d04a5945000
  close(3)                                = 0
  openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libaudit.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\0\0\0\0\0\0\0\0"..., 832) = 832
  fstat(3, {st_mode=S_IFREG|0644, st_size=153760, ...}) = 0
  mmap(NULL, 200880, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a590e000
  mmap(0x7d04a5911000, 49152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7d04a5911000
  mmap(0x7d04a591d000, 86016, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7d04a591d000
  mmap(0x7d04a5932000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7d04a5932000
  mmap(0x7d04a5934000, 45232, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7d04a5934000
  close(3)                                = 0
  openat(AT_FDCWD, "/lib/x86_64-linux-gnu/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\0\245\2\0\0\0\0\0"..., 832) = 832
  pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 840, 64) = 840
  fstat(3, {st_mode=S_IFREG|0755, st_size=2182752, ...}) = 0
  pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 840, 64) = 840
  mmap(NULL, 2227832, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5600000
  mmap(0x7d04a5628000, 1662976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7d04a5628000
  mmap(0x7d04a57be000, 323584, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1be000) = 0x7d04a57be000
  mmap(0x7d04a580d000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20c000) = 0x7d04a580d000
  mmap(0x7d04a5813000, 52856, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7d04a5813000
  close(3)                                = 0
  openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libcap-ng.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\0\0\0\0\0\0\0\0"..., 832) = 832
  fstat(3, {st_mode=S_IFREG|0644, st_size=31024, ...}) = 0
  mmap(NULL, 32816, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7d04a5905000
  mmap(0x7d04a5907000, 16384, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7d04a5907000
  mmap(0x7d04a590b000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7d04a590b000
  mmap(0x7d04a590c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7d04a590c000
  close(3)                                = 0
  mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5903000
  mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7d04a5901000
  arch_prctl(ARCH_SET_FS, 0x7d04a59045c0) = 0
  set_tid_address(0x7d04a5904890)         = 256045
  set_robust_list(0x7d04a59048a0, 24)     = 0
  rseq(0x7d04a59044c0, 0x20, 0, 0x53053053) = 0
  mprotect(0x7d04a580d000, 16384, PROT_READ) = 0
  mprotect(0x7d04a590c000, 4096, PROT_READ) = 0
  mprotect(0x7d04a5932000, 4096, PROT_READ) = 0
  mprotect(0x7d04a5957000, 4096, PROT_READ) = 0
  mprotect(0x7d04a5945000, 4096, PROT_READ) = 0
  mprotect(0x56dff9b1b000, 4096, PROT_READ) = 0
  mprotect(0x7d04a59a4000, 8192, PROT_READ) = 0
  prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
  munmap(0x7d04a5959000, 36429)           = 0
  openat(AT_FDCWD, "/proc/sys/kernel/cap_last_cap", O_RDONLY) = 3
  fstatfs(3, {f_type=PROC_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={val=[0x18, 0]}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
  read(3, "40\n", 7)                      = 3
  close(3)                                = 0
  prctl(PR_CAPBSET_READ, CAP_CHOWN)       = 1
  prctl(PR_GET_SECUREBITS)                = 0
  prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0)  = 0
  prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_CHOWN, 0, 0) = 0
  getpid()                                = 256045
  getrandom("\x65\x99\x4e\x8d\x18\x2d\xba\x42", 8, GRND_NONBLOCK) = 8
  brk(NULL)                               = 0x56e0011a9000
  brk(0x56e0011ca000)                     = 0x56e0011ca000
  openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
  fstat(3, {st_mode=S_IFREG|0644, st_size=3063024, ...}) = 0
  mmap(NULL, 3063024, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7d04a5200000
  close(3)                                = 0
  openat(AT_FDCWD, "/etc/login.defs", O_RDONLY) = 3
  fstat(3, {st_mode=S_IFREG|0644, st_size=5939, ...}) = 0
  read(3, "#\n# /etc/login.defs - Configurat"..., 4096) = 4096
  read(3, "# any combination of letters \"fr"..., 4096) = 1843
  read(3, "", 4096)                       = 0
  close(3)                                = 0
  openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
  fstat(3, {st_mode=S_IFREG|0644, st_size=2996, ...}) = 0
  read(3, "# Locale name alias data base.\n#"..., 4096) = 2996
  read(3, "", 4096)                       = 0
  close(3)                                = 0
  openat(AT_FDCWD, "/usr/share/locale/en_US.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale/en.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
  rt_sigaction(SIGALRM, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
  rt_sigaction(SIGALRM, NULL, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, 8) = 0
  rt_sigaction(SIGALRM, {sa_handler=0x56dff9b16ff0, sa_mask=[ALRM], sa_flags=SA_RESTORER, sa_restorer=0x7d04a5645810}, NULL, 8) = 0
  alarm(60)                               = 0
  rt_sigaction(SIGQUIT, {sa_handler=SIG_IGN, sa_mask=[QUIT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
  rt_sigaction(SIGINT, {sa_handler=SIG_IGN, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7d04a5645810}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
  setpriority(PRIO_PROCESS, 0, 0)         = 0
  getuid()                                = 0
  geteuid()                               = 0
  getgid()                                = 0
  getegid()                               = 0
  prctl(PR_GET_DUMPABLE)                  = 1 (SUID_DUMP_USER)
  close_range(3, 4294967295, 0)           = 0
  setpgid(0, 0)                           = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  fstat(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}) = 0
  readlink("/proc/self/fd/0", "/dev/pts/1", 4095) = 10
  newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}, 0) = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}, AT_SYMLINK_NOFOLLOW) = 0
  access("/dev/pts/1", R_OK|W_OK)         = 0
  ioctl(0, TIOCGWINSZ, {ws_row=116, ws_col=345, ws_xpixel=640, ws_ypixel=480}) = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  fchown(0, 0, 0)                         = 0
  fchmod(0, 0600)                         = 0
  ioctl(0, TCGETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
  ioctl(0, TCSETS, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
  --- SIGTTOU {si_signo=SIGTTOU, si_code=SI_KERNEL} ---
  --- stopped by SIGTTOU ---

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References

[Bug 2115838] [NEW] login command just Hangup immediately
From: Seyeong Kim, 2025-07-03