Arch Linux

knue

Member

Registered: 2011-10-11

Posts: 27

ntpd -q hangs

Hi all,

I'm currently having problems configuring my time correctly. According to https://wiki.archlinux.org/index.php/Ne … col_daemon:

The ntp package provides a default configuration file that should make ntpd work out of the box in client mode, without requiring custom configuration.

I've never touched any of ntp's config files, so I would assume that

ntpd -q

would just work. However, this is not the case:

ntpd -qd
 9 Apr 15:43:43 ntpd[4399]: ntpd 4.2.8p1@1.3265-o Fri Feb  6 17:14:44 UTC 2015 (1): Starting
 9 Apr 15:43:43 ntpd[4399]: Command line: ntpd -qd
 9 Apr 15:43:43 ntpd[4399]: proto: precision = 0.105 usec (-23)
Finished Parsing!!
move_fd: estimated max descriptors: 1024, initial socket boundary: 16
 9 Apr 15:43:43 ntpd[4399]: Listen and drop on 0 v6wildcard [::]:123
 9 Apr 15:43:43 ntpd[4399]: Listen and drop on 1 v4wildcard 0.0.0.0:123
 9 Apr 15:43:43 ntpd[4399]: Listen normally on 2 lo 127.0.0.1:123
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00003000 flags 00000001
 9 Apr 15:43:43 ntpd[4399]: Listen normally on 3 eth1 134.96.222.6:123
restrict: op 1 addr 134.96.222.6 mask 255.255.255.255 mflags 00003000 flags 00000001
 9 Apr 15:43:43 ntpd[4399]: Listen normally on 4 vpn0 134.96.160.58:123
restrict: op 1 addr 134.96.160.58 mask 255.255.255.255 mflags 00003000 flags 00000001
 9 Apr 15:43:43 ntpd[4399]: Listen normally on 5 lo [::1]:123
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
 9 Apr 15:43:43 ntpd[4399]: Listen normally on 6 eth1 [fe80::222:4dff:fe89:589a%4]:123
restrict: op 1 addr fe80::222:4dff:fe89:589a%4 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
 9 Apr 15:43:43 ntpd[4399]: Listening on routing socket on fd #23 for interface updates
restrict: op 1 addr 0.0.0.0 mask 0.0.0.0 mflags 00000000 flags 000005f0
restrict: op 1 addr :: mask :: mflags 00000000 flags 000005f0
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00000000 flags 00000000
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00000000 flags 00000000
event at 0 0.0.0.0 c016 06 restart
peer_name_resolved(0.arch.pool.ntp.org) rescode 0
key_expire: at 0 associd 41893
peer_clear: at 0 next 2 associd 41893 refid INIT
event at 0 81.88.24.155 8011 81 mobilize assoc 41893
newpeer: 134.96.160.58->81.88.24.155 mode 3 vers 4 poll 6 10 flags 0x101 0x1 ttl 0 key 00000000
peer_name_resolved(1.arch.pool.ntp.org) rescode 0
key_expire: at 0 associd 41894
peer_clear: at 0 next 5 associd 41894 refid INIT
event at 0 80.70.176.51 8011 81 mobilize assoc 41894
newpeer: 134.96.160.58->80.70.176.51 mode 3 vers 4 poll 6 10 flags 0x101 0x1 ttl 0 key 00000000
peer_name_resolved(2.arch.pool.ntp.org) rescode 0
key_expire: at 0 associd 41895
peer_clear: at 0 next 5 associd 41895 refid INIT
event at 0 85.10.240.253 8011 81 mobilize assoc 41895
newpeer: 134.96.160.58->85.10.240.253 mode 3 vers 4 poll 6 10 flags 0x101 0x1 ttl 0 key 00000000
peer_name_resolved(3.arch.pool.ntp.org) rescode 0
key_expire: at 0 associd 41896
peer_clear: at 0 next 3 associd 41896 refid INIT
event at 0 129.70.132.35 8011 81 mobilize assoc 41896
newpeer: 134.96.160.58->129.70.132.35 mode 3 vers 4 poll 6 10 flags 0x101 0x1 ttl 0 key 00000000
select() returned -1: Interrupted system call
auth_agekeys: at 1 keys 0 expired 0
select() returned -1: Interrupted system call
transmit: at 2 134.96.160.58->81.88.24.155 mode 3 len 48
select() returned -1: Interrupted system call
transmit: at 3 134.96.160.58->129.70.132.35 mode 3 len 48
select() returned -1: Interrupted system call
select() returned -1: Interrupted system call
transmit: at 5 134.96.160.58->85.10.240.253 mode 3 len 48
transmit: at 5 134.96.160.58->80.70.176.51 mode 3 len 48
select() returned -1: Interrupted system call
select() returned -1: Interrupted system call
select() returned -1: Interrupted system call
...

and then the command hangs repeating the "Interrupted system call" message endlessly.

Last edited by knue (2015-04-09 12:43:12)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,287

Re: ntpd -q hangs

I've not used ntpd for some time.  IIRC, something happened where it had to be run with elevated privilege.   Did you try it as root?

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knue

Member

Registered: 2011-10-11

Posts: 27

Re: ntpd -q hangs

yes, I've issued above command as root.

teateawhy

Member

From: GER

Registered: 2012-03-05

Posts: 1,138

Website

Re: ntpd -q hangs

Do you get a response from the ntp server?

ping -c 3 0.arch.pool.ntp.org

knue

Member

Registered: 2011-10-11

Posts: 27

Re: ntpd -q hangs

yes

knue

Member

Registered: 2011-10-11

Posts: 27

Re: ntpd -q hangs

this is the relevant output I get with strace for the interrupted system call:

select(24, [16 17 18 19 20 21 22 23], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be restarted if no handler)
--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
rt_sigreturn({mask=[]})                 = -1 EINTR (Interrupted system call)
write(1, "select() returned -1: Interrupte"..., 46select() returned -1: Interrupted system call
) = 46

pszafer

Member

Registered: 2015-01-22

Posts: 39

Re: ntpd -q hangs

did you try sniff if some packets are coming back to you and if yes, what is in those reponses?

knue

Member

Registered: 2011-10-11

Posts: 27

Re: ntpd -q hangs

not yet. what's a quick way of doing this?

Last edited by knue (2015-04-15 22:49:58)

teateawhy

Member

From: GER

Registered: 2012-03-05

Posts: 1,138

Website

Re: ntpd -q hangs

Here is the official explanation:
[https://barlog.rusu.info/valentin/blog/?p=395]

short answer: we have to wait till all kde5 applications are ported to KF5.

Did you reply to the wrong thread knue?

knue

Member

Registered: 2011-10-11

Posts: 27

Re: ntpd -q hangs

yes, I edited the correct reply above, but apparently you were faster
anyway, what's a quick way of doing this sniffing?

Last edited by knue (2015-04-16 10:57:48)

teateawhy

Member

From: GER

Registered: 2012-03-05

Posts: 1,138

Website

Re: ntpd -q hangs

tcpdump or wireshark

cro

Member

From: Germany

Registered: 2006-01-02

Posts: 101

Re: ntpd -q hangs

I had the same problem.
And I checked with tcpdump and I think it was simply because ntpd got no answer from the servers, probably firewalled.
When I use time servers from my network, it works as normal.
Question is why ntpd keeps waiting for so long that one might think it hangs? I think that doesn't make much sense, especially considering the purpose is synchronizing clocks.

Last edited by cro (2015-05-27 13:56:18)

ratcheer

Member

Registered: 2011-10-09

Posts: 912

Re: ntpd -q hangs

Try "ntpq -qn".

Tim

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 13,116

Re: ntpd -q hangs

That won't work, try  ntpq -p or ntpq -pd .

Last edited by Lone_Wolf (2015-05-28 13:47:29)

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Try clean chroot manager by graysky

ratcheer

Member

Registered: 2011-10-09

Posts: 912

Re: ntpd -q hangs

Sorry, my mistake. I meant -pn. I've been using systemd-timesyncd so long, I'm forgetting the ntp commands.

Tim

Last edited by ratcheer (2015-05-29 18:33:33)