5

I'm using Fedora 23, the same problem was on Fedora 22. Sudo takes ~20 seconds to start, it doing something for ~20 seconds then asks password.

Reboot solves this problem for a while. After a few hours the problem appear again.

Here is peace of strace output

 0.000022 write(7, "\1", 1) = 1 0.000038 rt_sigreturn({mask=[INT QUIT]}) = -1 EINTR (Interrupted system call) 0.000026 --- SIGCONT {si_signo=SIGCONT, si_code=SI_KERNEL} --- 0.000012 poll([{fd=11, events=POLLIN}], 1, 25000) = 0 (Timeout) 25.025434 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\204\0\0\0\6\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"..., 144}, {"\177\0\0\0type='signal',sender='net.re"..., 132}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 276 0.000378 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\246\0\0\0\7\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"..., 144}, {"\241\0\0\0type='signal',sender='org.fr"..., 166}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 310 0.000176 write(12, "\1\0\0\0\0\0\0\0", 8) = 8 0.000109 close(11) = 0 0.000121 close(12) = 0 0.000090 getuid() = 1000

You can see that sendmsg takes too much time.

Can someone help me with this? I don't want to reboot my laptop every time this happen.

uname -a Linux c0rp 4.4.9-300.fc23.x86_64

Link to strace http://pastebin.com/n5GWi9G1

Here is output from strace -f -v -s300 -o log sudo

8204 poll([{fd=11, events=POLLIN}], 1, -1) = 1 ([{fd=11, revents=POLLIN}]) 8204 read(11, "AGREE_UNIX_FD\r\n", 2048) = 15 8204 poll([{fd=11, events=POLLOUT}], 1, -1) = 1 ([{fd=11, revents=POLLOUT}]) 8204 sendto(11, "BEGIN\r\n", 7, MSG_NOSIGNAL, NULL, 0) = 7 8204 poll([{fd=11, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=11, revents=POLLOUT}]) 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\0\0\0\0\1\0\0\0n\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.fr eedesktop.DBus\0\0\0\0\3\1s\0\5\0\0\0Hello\0\0\0", 128}, {"", 0}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 128 8204 poll([{fd=11, events=POLLIN}], 1, 25000) = 1 ([{fd=11, revents=POLLIN}]) 8204 recvmsg(11, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1\v\0\0\0\1\0\0\0=\0\0\0\6\1s\0\6\0\0\0:1.491\0\0\5\1u\0\1\0\0\0\10\1g\0\1s\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\6\0\0\0:1 .491\0l\4\1\1\v\0\0\0\2\0\0\0\215\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\f\0\0\0NameAcquired\0\0\0\0\6\1s\0\6\0\0\0:1.491\0\0\10\ 1g\0\1s\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\6\0\0\0:1.491\0", 2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 262 8204 recvmsg(11, 0x7ffec28d88e0, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable) 8204 eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK) = 12 8204 write(12, "\1\0\0\0\0\0\0\0", 8) = 8 8204 fstat(11, {st_dev=makedev(0, 8), st_ino=3014822, st_mode=S_IFSOCK|0777, st_nlink=1, st_uid=0, st_gid=1000, st_blksize=4096, st_blocks=0, st_size=0, st_atime=0, st_mtime=0, st_ctime=0}) = 0 8204 fcntl(11, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK) 8204 write(12, "\1\0\0\0\0\0\0\0", 8) = 8 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\204\0\0\0\2\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\10\0\0\0AddMatch\0\0\0\0\0\0\0\0\10\1g\0\1s\0\0", 144}, {"\177\0\0\0type='signal',sender='net.reactivated.Fprint',path='/net/reactivated/Fprint/Manager',interface='net.reactivated.Fprint.Manager'\0", 132}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 276 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\246\0\0\0\3\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\10\0\0\0AddMatch\0\0\0\0\0\0\0\0\10\1g\0\1s\0\0", 144}, {"\241\0\0\0type='signal',sender='org.freedesktop.DBus',path='/org/freedesktop/DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='net.reactivated.Fprint'\0", 166}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 310 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\33\0\0\0\4\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\f\0\0\0GetNameOwner\0\0\0\0\10\1g\0\1s\0\0", 144}, {"\26\0\0\0net.reactivated.Fprint\0", 27}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 171 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\0\0\0\0\5\0\0\0\203\0\0\0\1\1o\0\37\0\0\0/net/reactivated/Fprint/Manager\0\6\1s\0\26\0\0\0net.reactivated.Fprint\0\0\2\1s\0\36\0\0\0net.reactivated.Fprint.Manager\0\0\3\1s\0\n\0\0\0GetDevices\0\0\0\0\0\0", 152}, {"", 0}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 152 8204 poll([{fd=11, events=POLLIN}], 1, 25000) = 1 ([{fd=11, revents=POLLIN}]) 8204 recvmsg(11, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1\v\0\0\0\3\0\0\0=\0\0\0\6\1s\0\6\0\0\0:1.491\0\0\5\1u\0\4\0\0\0\10\1g\0\1s\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\6\0\0\0:1.413\0", 2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 91 8204 write(12, "\1\0\0\0\0\0\0\0", 8) = 8 8204 recvmsg(11, 0x7ffec28d8730, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable) 8204 poll([{fd=11, events=POLLIN}], 1, 25000) = ? ERESTART_RESTARTBLOCK (Interrupted by signal) 8204 --- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} --- 8204 restart_syscall(<... resuming interrupted poll ...>) = 0 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\204\0\0\0\6\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\v\0\0\0RemoveMatch\0\0\0\0\0\10\1g\0\1s\0\0", 144}, {"\177\0\0\0type='signal',sender='net.reactivated.Fprint',path='/net/reactivated/Fprint/Manager',interface='net.reactivated.Fprint.Manager'\0", 132}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 276 8204 sendmsg(11, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\1\1\246\0\0\0\7\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\v\0\0\0RemoveMatch\0\0\0\0\0\10\1g\0\1s\0\0", 144}, {"\241\0\0\0type='signal',sender='org.freedesktop.DBus',path='/org/freedesktop/DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='net.reactivated.Fprint'\0", 166}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 310

/etc/nsswitch.conf

# # /etc/nsswitch.conf passwd: files sss shadow: files sss group: files sss #initgroups: files #hosts: db files nisplus nis dns hosts: files mdns4_minimal [NOTFOUND=return] dns myhostname mymachines # Example - obey only what nisplus tells us... #services: nisplus [NOTFOUND=return] files #networks: nisplus [NOTFOUND=return] files #protocols: nisplus [NOTFOUND=return] files #rpc: nisplus [NOTFOUND=return] files #ethers: nisplus [NOTFOUND=return] files #netmasks: nisplus [NOTFOUND=return] files bootparams: nisplus [NOTFOUND=return] files ethers: files netmasks: files networks: files protocols: files rpc: files services: files sss netgroup: files sss publickey: nisplus automount: files sss aliases: files nisplus
Improve this question
11
  • Please provide full strace output, if necessary, post it to pastebin. Commented Jun 2, 2016 at 13:12
  • still insufficient; poll call timeouts then recvmsg plays with something that comes from freedesktop code? strace -f -v -s300 -o log sudo ... will give the best info. Commented Jun 2, 2016 at 13:16
  • Check that your syslog daemon is working correctly; For example, does logger 'Hello world' return within a reasonable amount of time? Commented Jun 2, 2016 at 13:16
  • 1
    So judging by connect(11, {sa_family=AF_LOCAL, sun_path="/run/dbus/system_bus_socket"}, 29) = 0 - you probably got problems with dbus, possibly dbus daemon is not running or malfunction. Commented Jun 2, 2016 at 13:53
  • 1
    please add the contents of your /etc/nsswitch.conf to your question Commented Jun 3, 2016 at 0:22

1 Answer 1

Reset to default
1

The full strace in your pastebin link shows that sudo is trying to open libnss-sss.so.2: 

open("/lib64/libnss_sss.so.2", O_RDONLY|O_CLOEXEC) = 8

That's an NSS module for SSSD - System Security Services Daemon, which manages access to various remote authentication services.

Check that the SSSD is installed and running. If it is, then try following the instructions on that site for debugging sudo issues.

If it isn't then either find out why and fix it or (if you don't want/need sss) just edit /etc/nsswitch.conf and comment out or delete sss from all the services that are configured to use it.

Improve this answer
2
  • Thanks for answering. I already reboot my laptop, I will check it when this happen again and let you know. Commented Jun 3, 2016 at 8:19
  • I removed all sss but it is still long pause befora asking password. Also I can't restart sssd, it is saying: Job for sssd.service failed because the control process exited with error code. See "systemctl status sssd.service" and "journalctl -xe" for details. Commented Jun 3, 2016 at 16:37

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.