Segmentation fault running ntpd

[Adrian Chadd]

Is this still happening for you?


-a


On 24 July 2015 at 06:03, David Wolfskill <david at catwhisker.org> wrote:
> On Sun, Jul 19, 2015 at 11:36:00AM -0700, David Wolfskill wrote:
>> On Sun, Jul 19, 2015 at 10:24:11AM -0600, Ian Lepore wrote:
>> > ...
>> > Was there anything (at all) in /var/log/messages about ntpd?  Even the
>> > routine messages (such as what interfaces it binds to) might give a bit
>> > of a clue about how far it got in its init before it died.
>> > ....
>>
>> Sorry; there might have been something yesterday...
>> If I do get another recurrence, I'll try to gather a bit more
>> information.
>> ....
>
> OK; got another one.
>
> This time, I have the complete /var/log/messages for a verbose boot,
> from that boot to just a bit after the ntpd crash; it's in
> <http://www.catwhisker.org/~david/FreeBSD/head>; as of the moment, that
> contains:
>
> [PARENTDIR] Parent Directory                             -
> [   ] CANARY                  2015-03-22 10:03   15K
> [   ] CANARY.gz               2015-03-22 10:03  6.3K
> [   ] ntpd.core               2015-07-24 05:31   13M
> [   ] ntpd.core.gz            2015-07-24 05:31  124K
> [TXT] ntpd_crash_msgs.txt     2015-07-24 05:40  138K
> [   ] ntpd_crash_msgs.txt.gz  2015-07-24 05:40   19K
>
> This was running:
>
> FreeBSD g1-245.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #133  r285836M/285836:1100077: Fri Jul 24 05:24:41 PDT 2015     root at g1-245.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY  amd64
>
>
> Trying "gdb /usr/obj/usr/src/usr.sbin/ntp/ntpd/ntpd ntpd.core" still
> doesn't help much:
>
> This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
> Core was generated by `ntpd'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from /lib/libm.so.5...(no debugging symbols found)...done.
> ...
> Loaded symbols for /libexec/ld-elf.so.1
> #0  0x00000008011cd6a0 in sbrk () from /lib/libc.so.7
> [New Thread 801c07400 (LWP 100133/<unknown>)]
> [New Thread 801c06400 (LWP 100132/<unknown>)]
> (gdb) bt
> #0  0x00000008011cd6a0 in sbrk () from /lib/libc.so.7
> #1  0x00000008ccbd4f34 in ?? ()
> #2  0x0000000000000005 in ?? ()
> #3  0x0000000801800448 in ?? ()
> #4  0x00000008011ca888 in sbrk () from /lib/libc.so.7
> #5  0x00000008018000c8 in ?? ()
> #6  0x00000008018000c0 in ?? ()
> #7  0x0000000000000208 in ?? ()
> #8  0x0000000801c32fb0 in ?? ()
> #9  0x0000000000000001 in ?? ()
> #10 0x0000000801cc20c8 in ?? ()
> #11 0x0000000000000030 in ?? ()
> #12 0x0000000801cc20c8 in ?? ()
> #13 0x00007fffffffe480 in ?? ()
> #14 0x00000008011cd240 in sbrk () from /lib/libc.so.7
> #15 0x0000000000000280 in ?? ()
> #16 0x00000008014bbc70 in malloc_message () from /lib/libc.so.7
> #17 0x00000008018000c0 in ?? ()
> #18 0x0000000801800448 in ?? ()
> #19 0x0000000000000032 in ?? ()
> #20 0x0000000801800458 in ?? ()
> #21 0x00000008014bbc68 in malloc_message () from /lib/libc.so.7
> #22 0x0000000801cc2000 in ?? ()
> #23 0x00000008014bba60 in malloc_message () from /lib/libc.so.7
> #24 0x0000000801cc20d8 in ?? ()
> #25 0x00000000000000a0 in ?? ()
> #26 0x0000000000000208 in ?? ()
> #27 0x00007fffffffe4d0 in ?? ()
> #28 0x00000008011bdd7a in _malloc_thread_cleanup () from /lib/libc.so.7
> Previous frame inner to this frame (corrupt stack?)
> (gdb)
>
>
> I am presently suspecting that it's a bit dependent on ... well, "timing".
>
> I have my ~/.xsession set up so that once I've entered the passphrase(s)
> for my SSH private key(s), scripts start running to establish
> connections to other machines -- e.g., open an xterm locally, ssh
> over to my mailhub and (re-)establish a tmux session on that machine
> where I run mutt to read & write email (such as this message).
>
> While that almost always Just Works in stable/10, it's rather ...
> spottier ... in head -- I'd say it's about a 50% probability that it will
> work, vs. the ssh connection attempt hanging, and eventually timing out.
> But if I've waited (say) 30 seconds or so, I can establish such a
> connection easily.
>
> Granted, I am using wireless (802.11), but I get a sense that "things"
> are claimed to be "ready to go" a bit prematurely -- at least sometimes.
>
> Peace,
> david
> --
> David H. Wolfskill                              david at catwhisker.org
> Those who murder in the name of God or prophet are blasphemous cowards.
>
> See http://www.catwhisker.org/~david/publickey.gpg for my public key.